MySQL學習之——show processlist

SHOW PROCESSLIST顯示哪些線程正在運行。您也可以使用mysqladmin processlist語句得到此信息。如果您有SUPER權限,您可以看到所有線程。否則,您只能看到您自己的線程(也就是,與您正在使用的MySQL賬戶相關的線程)。請參見13.5.5.3節,“KILL語法”。如果您不使用FULL關鍵詞,則只顯示每個查詢的前100個字符。

本語句報告TCP/IP連接的主機名稱(採用host_name:client_port格式),以方便地判定哪個客戶端正在做什麼。

如果您得到“too many connections”錯誤信息,並且想要了解正在發生的情況,本語句是非常有用的。MySQL保留一個額外的連接,讓擁有SUPER權限的 賬戶使用,以確保管理員能夠隨時連接和檢查系統(假設您沒有把此權限給予所有的用戶)。

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  1. mysql> show full processlist;  
  2. +---------+-------------+--------------------+----------------+-------------+-------+-----------------------------------------------------------------------+-----------------------+  
  3. | Id      | User        | Host               | db             | Command     | Time  | State                                                                 | Info                  |  
  4. +---------+-------------+--------------------+----------------+-------------+-------+-----------------------------------------------------------------------+-----------------------+  
  5. | 1056536 | replication | 192.168.6.91:38417 | NULL           | Binlog Dump | 33759 | Master has sent all binlog to slave; waiting for binlog to be updated | NULL                  |  
  6. | 1107067 | miaohr      | 192.168.6.81:32024 | NULL           | Query       |     0 | NULL                                                                  | show full processlist |  
  7. | 1107182 | miaohr      | 192.168.6.91:44217 | hr_db_business | Sleep       |     1 |                                                                       | NULL                  |  
  8. +---------+-------------+--------------------+----------------+-------------+-------+-----------------------------------------------------------------------+-----------------------+  


這個命令中最關鍵的就是state列,mysql列出的狀態主要有以下幾種:

Checking table
 正在檢查數據表(這是自動的)。
Closing tables
 正在將表中修改的數據刷新到磁盤中,同時正在關閉已經用完的表。這是一個很快的操作,如果不是這樣的話,就應該確認磁盤空間是否已經滿了或者磁盤是否正處於重負中。
Connect Out
 複製從服務器正在連接主服務器。
Copying to tmp table on disk
 由於臨時結果集大於tmp_table_size,正在將臨時表從內存存儲轉爲磁盤存儲以此節省內存。
Creating tmp table
 正在創建臨時表以存放部分查詢結果。
deleting from main table
 服務器正在執行多表刪除中的第一部分,剛刪除第一個表。
deleting from reference tables
 服務器正在執行多表刪除中的第二部分,正在刪除其他表的記錄。
Flushing tables
 正在執行FLUSH TABLES,等待其他線程關閉數據表。
Killed
 發送了一個kill請求給某線程,那麼這個線程將會檢查kill標誌位,同時會放棄下一個kill請求。MySQL會在每次的主循環中檢查kill標誌位,不過有些情況下該線程可能會過一小段才能死掉。如果該線程程被其他線程鎖住了,那麼kill請求會在鎖釋放時馬上生效。
Locked
 被其他查詢鎖住了。
Sending data
 正在處理SELECT查詢的記錄,同時正在把結果發送給客戶端。
Sorting for group
 正在爲GROUP BY做排序。
 Sorting for order
 正在爲ORDER BY做排序。
Opening tables
 這個過程應該會很快,除非受到其他因素的干擾。例如,在執ALTER TABLE或LOCK TABLE語句行完以前,數據表無法被其他線程打開。正嘗試打開一個表。
Removing duplicates
 正在執行一個SELECT DISTINCT方式的查詢,但是MySQL無法在前一個階段優化掉那些重複的記錄。因此,MySQL需要再次去掉重複的記錄,然後再把結果發送給客戶端。
Reopen table
 獲得了對一個表的鎖,但是必須在表結構修改之後才能獲得這個鎖。已經釋放鎖,關閉數據表,正嘗試重新打開數據表。
Repair by sorting
 修復指令正在排序以創建索引。
Repair with keycache
 修復指令正在利用索引緩存一個一個地創建新索引。它會比Repair by sorting慢些。
Searching rows for update
 正在講符合條件的記錄找出來以備更新。它必須在UPDATE要修改相關的記錄之前就完成了。
Sleeping
 正在等待客戶端發送新請求.
System lock
 正在等待取得一個外部的系統鎖。如果當前沒有運行多個mysqld服務器同時請求同一個表,那麼可以通過增加--skip-external-locking參數來禁止外部系統鎖。
Upgrading lock
 INSERT DELAYED正在嘗試取得一個鎖表以插入新記錄。
Updating
 正在搜索匹配的記錄,並且修改它們。
User Lock
 正在等待GET_LOCK()。
Waiting for tables
 該線程得到通知,數據表結構已經被修改了,需要重新打開數據表以取得新的結構。然後,爲了能的重新打開數據表,必須等到所有其他線程關閉這個表。以下幾種情況下會產生這個通知:FLUSH TABLES tbl_name, ALTER TABLE, RENAME TABLE, REPAIR TABLE, ANALYZE TABLE,或OPTIMIZE TABLE。
waiting for handler insert
 INSERT DELAYED已經處理完了所有待處理的插入操作,正在等待新的請求。
 大部分狀態對應很快的操作,只要有一個線程保持同一個狀態好幾秒鐘,那麼可能是有問題發生了,需要檢查一下。
 還有其他的狀態沒在上面中列出來,不過它們大部分只是在查看服務器是否有存在錯誤是才用得着。

mysql 查看當前連接數

命令: show processlist; 
如果是root帳號,你能看到所有用戶的當前連接。如果是其它普通帳號,只能看到自己佔用的連接。 
show processlist;只列出前100條,如果想全列出請使用show full processlist; 
mysql> show processlist;

命令: show status;


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  1. mysql> show status;  
  2. +------------------------------------------+----------------------+  
  3. | Variable_name                            | Value                |  
  4. +------------------------------------------+----------------------+  
  5. | Aborted_clients                          | 777                  |  
  6. | Aborted_connects                         | 16                   |  
  7. | Binlog_cache_disk_use                    | 532                  |  
  8. | Binlog_cache_use                         | 8333221              |  
  9. | Binlog_stmt_cache_disk_use               | 0                    |  
  10. | Binlog_stmt_cache_use                    | 18732                |  
  11. | Bytes_received                           | 303                  |  
  12. | Bytes_sent                               | 12460                |  
  13. | Com_admin_commands                       | 0                    |  
  14. | Com_assign_to_keycache                   | 0                    |  
  15. | Com_alter_db                             | 0                    |  
  16. | Com_alter_db_upgrade                     | 0                    |  
  17. | Com_alter_event                          | 0                    |  
  18. | Com_alter_function                       | 0                    |  
  19. | Com_alter_procedure                      | 0                    |  
  20. | Com_alter_server                         | 0                    |  
  21. | Com_alter_table                          | 0                    |  
  22. | Com_alter_tablespace                     | 0                    |  
  23. | Com_analyze                              | 0                    |  
  24. | Com_begin                                | 0                    |  
  25. | Com_binlog                               | 0                    |  
  26. | Com_call_procedure                       | 0                    |  
  27. | Com_change_db                            | 0                    |  
  28. | Com_change_master                        | 0                    |  
  29. | Com_check                                | 0                    |  
  30. | Com_checksum                             | 0                    |  
  31. | Com_commit                               | 0                    |  
  32. | Com_create_db                            | 0                    |  
  33. | Com_create_event                         | 0                    |  
  34. | Com_create_function                      | 0                    |  
  35. | Com_create_index                         | 0                    |  
  36. | Com_create_procedure                     | 0                    |  
  37. | Com_create_server                        | 0                    |  
  38. | Com_create_table                         | 0                    |  
  39. | Com_create_trigger                       | 0                    |  
  40. | Com_create_udf                           | 0                    |  
  41. | Com_create_user                          | 0                    |  
  42. | Com_create_view                          | 0                    |  
  43. | Com_dealloc_sql                          | 0                    |  
  44. | Com_delete                               | 0                    |  
  45. | Com_delete_multi                         | 0                    |  
  46. | Com_do                                   | 0                    |  
  47. | Com_drop_db                              | 0                    |  
  48. | Com_drop_event                           | 0                    |  
  49. | Com_drop_function                        | 0                    |  
  50. | Com_drop_index                           | 0                    |  
  51. | Com_drop_procedure                       | 0                    |  
  52. | Com_drop_server                          | 0                    |  
  53. | Com_drop_table                           | 0                    |  
  54. | Com_drop_trigger                         | 0                    |  
  55. | Com_drop_user                            | 0                    |  
  56. | Com_drop_view                            | 0                    |  
  57. | Com_empty_query                          | 0                    |  
  58. | Com_execute_sql                          | 0                    |  
  59. | Com_flush                                | 0                    |  
  60. | Com_grant                                | 0                    |  
  61. | Com_ha_close                             | 0                    |  
  62. | Com_ha_open                              | 0                    |  
  63. | Com_ha_read                              | 0                    |  
  64. | Com_help                                 | 0                    |  
  65. | Com_insert                               | 0                    |  
  66. | Com_insert_select                        | 0                    |  
  67. | Com_install_plugin                       | 0                    |  
  68. | Com_kill                                 | 0                    |  
  69. | Com_load                                 | 0                    |  
  70. | Com_lock_tables                          | 0                    |  
  71. | Com_optimize                             | 0                    |  
  72. | Com_preload_keys                         | 0                    |  
  73. | Com_prepare_sql                          | 0                    |  
  74. | Com_purge                                | 0                    |  
  75. | Com_purge_before_date                    | 0                    |  
  76. | Com_release_savepoint                    | 0                    |  
  77. | Com_rename_table                         | 0                    |  
  78. | Com_rename_user                          | 0                    |  
  79. | Com_repair                               | 0                    |  
  80. | Com_replace                              | 0                    |  
  81. | Com_replace_select                       | 0                    |  
  82. | Com_reset                                | 0                    |  
  83. | Com_resignal                             | 0                    |  
  84. | Com_revoke                               | 0                    |  
  85. | Com_revoke_all                           | 0                    |  
  86. | Com_rollback                             | 0                    |  
  87. | Com_rollback_to_savepoint                | 0                    |  
  88. | Com_savepoint                            | 0                    |  
  89. | Com_select                               | 1                    |  
  90. | Com_set_option                           | 0                    |  
  91. | Com_signal                               | 0                    |  
  92. | Com_show_authors                         | 0                    |  
  93. | Com_show_binlog_events                   | 0                    |  
  94. | Com_show_binlogs                         | 0                    |  
  95. | Com_show_charsets                        | 0                    |  
  96. | Com_show_collations                      | 0                    |  
  97. | Com_show_contributors                    | 0                    |  
  98. | Com_show_create_db                       | 0                    |  
  99. | Com_show_create_event                    | 0                    |  
  100. | Com_show_create_func                     | 0                    |  
  101. | Com_show_create_proc                     | 0                    |  
  102. | Com_show_create_table                    | 0                    |  
  103. | Com_show_create_trigger                  | 0                    |  
  104. | Com_show_databases                       | 0                    |  
  105. | Com_show_engine_logs                     | 0                    |  
  106. | Com_show_engine_mutex                    | 0                    |  
  107. | Com_show_engine_status                   | 0                    |  
  108. | Com_show_events                          | 0                    |  
  109. | Com_show_errors                          | 0                    |  
  110. | Com_show_fields                          | 0                    |  
  111. | Com_show_function_status                 | 0                    |  
  112. | Com_show_grants                          | 0                    |  
  113. | Com_show_keys                            | 0                    |  
  114. | Com_show_master_status                   | 0                    |  
  115. | Com_show_open_tables                     | 0                    |  
  116. | Com_show_plugins                         | 0                    |  
  117. | Com_show_privileges                      | 0                    |  
  118. | Com_show_procedure_status                | 0                    |  
  119. | Com_show_processlist                     | 6                    |  
  120. | Com_show_profile                         | 0                    |  
  121. | Com_show_profiles                        | 0                    |  
  122. | Com_show_relaylog_events                 | 0                    |  
  123. | Com_show_slave_hosts                     | 0                    |  
  124. | Com_show_slave_status                    | 0                    |  
  125. | Com_show_status                          | 2                    |  
  126. | Com_show_storage_engines                 | 0                    |  
  127. | Com_show_table_status                    | 0                    |  
  128. | Com_show_tables                          | 0                    |  
  129. | Com_show_triggers                        | 0                    |  
  130. | Com_show_variables                       | 0                    |  
  131. | Com_show_warnings                        | 0                    |  
  132. | Com_slave_start                          | 0                    |  
  133. | Com_slave_stop                           | 0                    |  
  134. | Com_stmt_close                           | 0                    |  
  135. | Com_stmt_execute                         | 0                    |  
  136. | Com_stmt_fetch                           | 0                    |  
  137. | Com_stmt_prepare                         | 0                    |  
  138. | Com_stmt_reprepare                       | 0                    |  
  139. | Com_stmt_reset                           | 0                    |  
  140. | Com_stmt_send_long_data                  | 0                    |  
  141. | Com_truncate                             | 0                    |  
  142. | Com_uninstall_plugin                     | 0                    |  
  143. | Com_unlock_tables                        | 0                    |  
  144. | Com_update                               | 0                    |  
  145. | Com_update_multi                         | 0                    |  
  146. | Com_xa_commit                            | 0                    |  
  147. | Com_xa_end                               | 0                    |  
  148. | Com_xa_prepare                           | 0                    |  
  149. | Com_xa_recover                           | 0                    |  
  150. | Com_xa_rollback                          | 0                    |  
  151. | Com_xa_start                             | 0                    |  
  152. | Compression                              | OFF                  |  
  153. | Connections                              | 1107216              |  
  154. | Created_tmp_disk_tables                  | 0                    |  
  155. | Created_tmp_files                        | 564                  |  
  156. | Created_tmp_tables                       | 0                    |  
  157. | Delayed_errors                           | 0                    |  
  158. | Delayed_insert_threads                   | 0                    |  
  159. | Delayed_writes                           | 0                    |  
  160. | Flush_commands                           | 1                    |  
  161. | Handler_commit                           | 0                    |  
  162. | Handler_delete                           | 0                    |  
  163. | Handler_discover                         | 0                    |  
  164. | Handler_prepare                          | 0                    |  
  165. | Handler_read_first                       | 0                    |  
  166. | Handler_read_key                         | 0                    |  
  167. | Handler_read_last                        | 0                    |  
  168. | Handler_read_next                        | 0                    |  
  169. | Handler_read_prev                        | 0                    |  
  170. | Handler_read_rnd                         | 0                    |  
  171. | Handler_read_rnd_next                    | 0                    |  
  172. | Handler_rollback                         | 0                    |  
  173. | Handler_savepoint                        | 0                    |  
  174. | Handler_savepoint_rollback               | 0                    |  
  175. | Handler_update                           | 0                    |  
  176. | Handler_write                            | 0                    |  
  177. | Innodb_buffer_pool_pages_data            | 376178               |  
  178. | Innodb_buffer_pool_bytes_data            | 4261109760           |  
  179. | Innodb_buffer_pool_pages_dirty           | 0                    |  
  180. | Innodb_buffer_pool_bytes_dirty           | 0                    |  
  181. | Innodb_buffer_pool_pages_flushed         | 4419408              |  
  182. | Innodb_buffer_pool_pages_free            | 0                    |  
  183. | Innodb_buffer_pool_pages_misc            | 18446744073709437581 |  
  184. | Innodb_buffer_pool_pages_total           | 262143               |  
  185. | Innodb_buffer_pool_read_ahead_rnd        | 0                    |  
  186. | Innodb_buffer_pool_read_ahead            | 506357               |  
  187. | Innodb_buffer_pool_read_ahead_evicted    | 49891                |  
  188. | Innodb_buffer_pool_read_requests         | 3550554620           |  
  189. | Innodb_buffer_pool_reads                 | 8777938              |  
  190. | Innodb_buffer_pool_wait_free             | 0                    |  
  191. | Innodb_buffer_pool_write_requests        | 159577779            |  
  192. | Innodb_data_fsyncs                       | 13359191             |  
  193. | Innodb_data_pending_fsyncs               | 0                    |  
  194. | Innodb_data_pending_reads                | 0                    |  
  195. | Innodb_data_pending_writes               | 0                    |  
  196. | Innodb_data_read                         | 133311885312         |  
  197. | Innodb_data_reads                        | 9323868              |  
  198. | Innodb_data_writes                       | 17580993             |  
  199. | Innodb_data_written                      | 163731449856         |  
  200. | Innodb_dblwr_pages_written               | 4419408              |  
  201. | Innodb_dblwr_writes                      | 119202               |  
  202. | Innodb_have_atomic_builtins              | ON                   |  
  203. | Innodb_log_waits                         | 0                    |  
  204. | Innodb_log_write_requests                | 39730223             |  
  205. | Innodb_log_writes                        | 12957426             |  
  206. | Innodb_os_log_fsyncs                     | 13004841             |  
  207. | Innodb_os_log_pending_fsyncs             | 0                    |  
  208. | Innodb_os_log_pending_writes             | 0                    |  
  209. | Innodb_os_log_written                    | 25546702336          |  
  210. | Innodb_page_size                         | 16384                |  
  211. | Innodb_pages_created                     | 539547               |  
  212. | Innodb_pages_read                        | 9323581              |  
  213. | Innodb_pages_written                     | 4419408              |  
  214. | Innodb_row_lock_current_waits            | 0                    |  
  215. | Innodb_row_lock_time                     | 26866245             |  
  216. | Innodb_row_lock_time_avg                 | 1367                 |  
  217. | Innodb_row_lock_time_max                 | 55497                |  
  218. | Innodb_row_lock_waits                    | 19649                |  
  219. | Innodb_rows_deleted                      | 15511                |  
  220. | Innodb_rows_inserted                     | 1868056              |  
  221. | Innodb_rows_read                         | 1657696248           |  
  222. | Innodb_rows_updated                      | 7778106              |  
  223. | Innodb_truncated_status_writes           | 0                    |  
  224. | Key_blocks_not_flushed                   | 0                    |  
  225. | Key_blocks_unused                        | 26773                |  
  226. | Key_blocks_used                          | 19                   |  
  227. | Key_read_requests                        | 67555                |  
  228. | Key_reads                                | 19                   |  
  229. | Key_write_requests                       | 69364                |  
  230. | Key_writes                               | 11544                |  
  231. | Last_query_cost                          | 0.000000             |  
  232. | Max_used_connections                     | 436                  |  
  233. | Not_flushed_delayed_rows                 | 0                    |  
  234. | Open_files                               | 99                   |  
  235. | Open_streams                             | 0                    |  
  236. | Open_table_definitions                   | 327                  |  
  237. | Open_tables                              | 1301                 |  
  238. | Opened_files                             | 22851                |  
  239. | Opened_table_definitions                 | 0                    |  
  240. | Opened_tables                            | 0                    |  
  241. | Performance_schema_cond_classes_lost     | 0                    |  
  242. | Performance_schema_cond_instances_lost   | 0                    |  
  243. | Performance_schema_file_classes_lost     | 0                    |  
  244. | Performance_schema_file_handles_lost     | 0                    |  
  245. | Performance_schema_file_instances_lost   | 0                    |  
  246. | Performance_schema_locker_lost           | 0                    |  
  247. | Performance_schema_mutex_classes_lost    | 0                    |  
  248. | Performance_schema_mutex_instances_lost  | 0                    |  
  249. | Performance_schema_rwlock_classes_lost   | 0                    |  
  250. | Performance_schema_rwlock_instances_lost | 0                    |  
  251. | Performance_schema_table_handles_lost    | 0                    |  
  252. | Performance_schema_table_instances_lost  | 0                    |  
  253. | Performance_schema_thread_classes_lost   | 0                    |  
  254. | Performance_schema_thread_instances_lost | 0                    |  
  255. | Prepared_stmt_count                      | 0                    |  
  256. | Qcache_free_blocks                       | 3426                 |  
  257. | Qcache_free_memory                       | 38784160             |  
  258. | Qcache_hits                              | 9223399              |  
  259. | Qcache_inserts                           | 3505151              |  
  260. | Qcache_lowmem_prunes                     | 0                    |  
  261. | Qcache_not_cached                        | 400457               |  
  262. | Qcache_queries_in_cache                  | 19336                |  
  263. | Qcache_total_blocks                      | 42289                |  
  264. | Queries                                  | 27883378             |  
  265. | Questions                                | 9                    |  
  266. | Rpl_status                               | AUTH_MASTER          |  
  267. | Select_full_join                         | 0                    |  
  268. | Select_full_range_join                   | 0                    |  
  269. | Select_range                             | 0                    |  
  270. | Select_range_check                       | 0                    |  
  271. | Select_scan                              | 0                    |  
  272. | Slave_heartbeat_period                   | 0.000                |  
  273. | Slave_open_temp_tables                   | 0                    |  
  274. | Slave_received_heartbeats                | 0                    |  
  275. | Slave_retried_transactions               | 0                    |  
  276. | Slave_running                            | OFF                  |  
  277. | Slow_launch_threads                      | 30                   |  
  278. | Slow_queries                             | 0                    |  
  279. | Sort_merge_passes                        | 0                    |  
  280. | Sort_range                               | 0                    |  
  281. | Sort_rows                                | 0                    |  
  282. | Sort_scan                                | 0                    |  
  283. | Ssl_accept_renegotiates                  | 0                    |  
  284. | Ssl_accepts                              | 0                    |  
  285. | Ssl_callback_cache_hits                  | 0                    |  
  286. | Ssl_cipher                               |                      |  
  287. | Ssl_cipher_list                          |                      |  
  288. | Ssl_client_connects                      | 0                    |  
  289. | Ssl_connect_renegotiates                 | 0                    |  
  290. | Ssl_ctx_verify_depth                     | 0                    |  
  291. | Ssl_ctx_verify_mode                      | 0                    |  
  292. | Ssl_default_timeout                      | 0                    |  
  293. | Ssl_finished_accepts                     | 0                    |  
  294. | Ssl_finished_connects                    | 0                    |  
  295. | Ssl_session_cache_hits                   | 0                    |  
  296. | Ssl_session_cache_misses                 | 0                    |  
  297. | Ssl_session_cache_mode                   | NONE                 |  
  298. | Ssl_session_cache_overflows              | 0                    |  
  299. | Ssl_session_cache_size                   | 0                    |  
  300. | Ssl_session_cache_timeouts               | 0                    |  
  301. | Ssl_sessions_reused                      | 0                    |  
  302. | Ssl_used_session_cache_entries           | 0                    |  
  303. | Ssl_verify_depth                         | 0                    |  
  304. | Ssl_verify_mode                          | 0                    |  
  305. | Ssl_version                              |                      |  
  306. | Table_locks_immediate                    | 13127661             |  
  307. | Table_locks_waited                       | 648                  |  
  308. | Tc_log_max_pages_used                    | 0                    |  
  309. | Tc_log_page_size                         | 0                    |  
  310. | Tc_log_page_waits                        | 6                    |  
  311. | Threads_cached                           | 7                    |  
  312. | Threads_connected                        | 2                    |  
  313. | Threads_created                          | 54593                |  
  314. | Threads_running                          | 2                    |  
  315. | Uptime                                   | 651324               |  
  316. | Uptime_since_flush_status                | 651324               |  
  317. +------------------------------------------+----------------------+  
  318. 312 rows in set (0.01 sec)  



Aborted_clients 由於客戶沒有正確關閉連接已經死掉,已經放棄的連接數量。 
Aborted_connects 嘗試已經失敗的MySQL服務器的連接的次數。 
Connections 試圖連接MySQL服務器的次數。 
Created_tmp_tables 當執行語句時,已經被創造了的隱含臨時表的數量。 
Delayed_insert_threads 正在使用的延遲插入處理器線程的數量。 
Delayed_writes 用INSERT DELAYED寫入的行數。 
Delayed_errors 用INSERT DELAYED寫入的發生某些錯誤(可能重複鍵值)的行數。 
Flush_commands 執行FLUSH命令的次數。 
Handler_delete 請求從一張表中刪除行的次數。 
Handler_read_first 請求讀入表中第一行的次數。 
Handler_read_key 請求數字基於鍵讀行。 
Handler_read_next 請求讀入基於一個鍵的一行的次數。 
Handler_read_rnd 請求讀入基於一個固定位置的一行的次數。 
Handler_update 請求更新表中一行的次數。 
Handler_write 請求向表中插入一行的次數。 
Key_blocks_used 用於關鍵字緩存的塊的數量。 
Key_read_requests 請求從緩存讀入一個鍵值的次數。 
Key_reads 從磁盤物理讀入一個鍵值的次數。 
Key_write_requests 請求將一個關鍵字塊寫入緩存次數。 
Key_writes 將一個鍵值塊物理寫入磁盤的次數。 
Max_used_connections 同時使用的連接的最大數目。 
Not_flushed_key_blocks 在鍵緩存中已經改變但是還沒被清空到磁盤上的鍵塊。 
Not_flushed_delayed_rows 在INSERT DELAY隊列中等待寫入的行的數量。 
Open_tables 打開表的數量。 
Open_files 打開文件的數量。 
Open_streams 打開流的數量(主要用於日誌記載) 
Opened_tables 已經打開的表的數量。 
Questions 發往服務器的查詢的數量。 
Slow_queries 要花超過long_query_time時間的查詢數量。 
Threads_connected 當前打開的連接的數量。 
Threads_running 不在睡眠的線程數量。 

Uptime 服務器工作了多少秒。

查看配置參數:

SHOW VARIABLES LIKE '%timeout%'

[plain] view plain copy
 print?
  1. Variable_name                                      Value                                                                                                                     
  2. -------------------------------------------------  ------------------------------------------------------------------------------------------------------------------------  
  3. auto_increment_increment                           1                                                                                                                         
  4. auto_increment_offset                              1                                                                                                                         
  5. autocommit                                         ON                                                                                                                        
  6. automatic_sp_privileges                            ON                                                                                                                        
  7. back_log                                           384                                                                                                                       
  8. basedir                                            /usr                                                                                                                      
  9. big_tables                                         OFF                                                                                                                       
  10. binlog_cache_size                                  1048576                                                                                                                   
  11. binlog_direct_non_transactional_updates            OFF                                                                                                                       
  12. binlog_format                                      MIXED                                                                                                                     
  13. binlog_stmt_cache_size                             32768                                                                                                                     
  14. bulk_insert_buffer_size                            67108864                                                                                                                  
  15. character_set_client                               utf8                                                                                                                      
  16. character_set_connection                           utf8                                                                                                                      
  17. character_set_database                             utf8                                                                                                                      
  18. character_set_filesystem                           binary                                                                                                                    
  19. character_set_results                              utf8                                                                                                                      
  20. character_set_server                               utf8                                                                                                                      
  21. character_set_system                               utf8                                                                                                                      
  22. character_sets_dir                                 /usr/share/mysql/charsets/                                                                                                
  23. collation_connection                               utf8_general_ci                                                                                                           
  24. collation_database                                 utf8_general_ci                                                                                                           
  25. collation_server                                   utf8_general_ci                                                                                                           
  26. completion_type                                    NO_CHAIN                                                                                                                  
  27. concurrent_insert                                  AUTO                                                                                                                      
  28. connect_timeout                                    10                                                                                                                        
  29. datadir                                            /var/lib/mysql/                                                                                                           
  30. date_format                                        %Y-%m-%d                                                                                                                  
  31. datetime_format                                    %Y-%m-%d %H:%i:%s                                                                                                         
  32. default_storage_engine                             InnoDB                                                                                                                    
  33. default_week_format                                0                                                                                                                         
  34. delay_key_write                                    ON                                                                                                                        
  35. delayed_insert_limit                               100                                                                                                                       
  36. delayed_insert_timeout                             300                                                                                                                       
  37. delayed_queue_size                                 1000                                                                                                                      
  38. div_precision_increment                            4                                                                                                                         
  39. engine_condition_pushdown                          ON                                                                                                                        
  40. error_count                                        0                                                                                                                         
  41. event_scheduler                                    OFF                                                                                                                       
  42. expire_logs_days                                   30                                                                                                                        
  43. external_user                                                                                                                                                                
  44. flush                                              OFF                                                                                                                       
  45. flush_time                                         0                                                                                                                         
  46. foreign_key_checks                                 ON                                                                                                                        
  47. ft_boolean_syntax                                  + -><()~*:""&|                                                                                                            
  48. ft_max_word_len                                    84                                                                                                                        
  49. ft_min_word_len                                    4                                                                                                                         
  50. ft_query_expansion_limit                           20                                                                                                                        
  51. ft_stopword_file                                   (built-in)                                                                                                                
  52. general_log                                        OFF                                                                                                                       
  53. general_log_file                                   /var/lib/mysql/VM84.log                                                                                                   
  54. group_concat_max_len                               1024                                                                                                                      
  55. have_compress                                      YES                                                                                                                       
  56. have_crypt                                         YES                                                                                                                       
  57. have_csv                                           YES                                                                                                                       
  58. have_dynamic_loading                               YES                                                                                                                       
  59. have_geometry                                      YES                                                                                                                       
  60. have_innodb                                        YES                                                                                                                       
  61. have_ndbcluster                                    NO                                                                                                                        
  62. have_openssl                                       DISABLED                                                                                                                  
  63. have_partitioning                                  YES                                                                                                                       
  64. have_profiling                                     YES                                                                                                                       
  65. have_query_cache                                   YES                                                                                                                       
  66. have_rtree_keys                                    YES                                                                                                                       
  67. have_ssl                                           DISABLED                                                                                                                  
  68. have_symlink                                       YES                                                                                                                       
  69. hostname                                           VM84                                                                                                                      
  70. identity                                           0                                                                                                                         
  71. ignore_builtin_innodb                              OFF                                                                                                                       
  72. init_connect                                                                                                                                                                 
  73. init_file                                                                                                                                                                    
  74. init_slave                                                                                                                                                                   
  75. innodb_adaptive_flushing                           ON                                                                                                                        
  76. innodb_adaptive_hash_index                         ON                                                                                                                        
  77. innodb_additional_mem_pool_size                    16777216                                                                                                                  
  78. innodb_autoextend_increment                        8                                                                                                                         
  79. innodb_autoinc_lock_mode                           1                                                                                                                         
  80. innodb_buffer_pool_instances                       1                                                                                                                         
  81. innodb_buffer_pool_size                            4294967296                                                                                                                
  82. innodb_change_buffering                            all                                                                                                                       
  83. innodb_checksums                                   ON                                                                                                                        
  84. innodb_commit_concurrency                          0                                                                                                                         
  85. innodb_concurrency_tickets                         500                                                                                                                       
  86. innodb_data_file_path                              ibdata1:10M:autoextend                                                                                                    
  87. innodb_data_home_dir                                                                                                                                                         
  88. innodb_doublewrite                                 ON                                                                                                                        
  89. innodb_fast_shutdown                               1                                                                                                                         
  90. innodb_file_format                                 Antelope                                                                                                                  
  91. innodb_file_format_check                           ON                                                                                                                        
  92. innodb_file_format_max                             Antelope                                                                                                                  
  93. innodb_file_per_table                              ON                                                                                                                        
  94. innodb_flush_log_at_trx_commit                     2                                                                                                                         
  95. innodb_flush_method                                                                                                                                                          
  96. innodb_force_load_corrupted                        OFF                                                                                                                       
  97. innodb_force_recovery                              0                                                                                                                         
  98. innodb_io_capacity                                 200                                                                                                                       
  99. innodb_large_prefix                                OFF                                                                                                                       
  100. innodb_lock_wait_timeout                           50                                                                                                                        
  101. innodb_locks_unsafe_for_binlog                     OFF                                                                                                                       
  102. innodb_log_buffer_size                             16777216                                                                                                                  
  103. innodb_log_file_size                               536870912                                                                                                                 
  104. innodb_log_files_in_group                          2                                                                                                                         
  105. innodb_log_group_home_dir                          ./                                                                                                                        
  106. innodb_max_dirty_pages_pct                         75                                                                                                                        
  107. innodb_max_purge_lag                               0                                                                                                                         
  108. innodb_mirrored_log_groups                         1                                                                                                                         
  109. innodb_old_blocks_pct                              37                                                                                                                        
  110. innodb_old_blocks_time                             0                                                                                                                         
  111. innodb_open_files                                  300                                                                                                                       
  112. innodb_print_all_deadlocks                         OFF                                                                                                                       
  113. innodb_purge_batch_size                            20                                                                                                                        
  114. innodb_purge_threads                               0                                                                                                                         
  115. innodb_random_read_ahead                           OFF                                                                                                                       
  116. innodb_read_ahead_threshold                        56                                                                                                                        
  117. innodb_read_io_threads                             4                                                                                                                         
  118. innodb_replication_delay                           0                                                                                                                         
  119. innodb_rollback_on_timeout                         OFF                                                                                                                       
  120. innodb_rollback_segments                           128                                                                                                                       
  121. innodb_spin_wait_delay                             6                                                                                                                         
  122. innodb_stats_method                                nulls_equal                                                                                                               
  123. innodb_stats_on_metadata                           ON                                                                                                                        
  124. innodb_stats_sample_pages                          8                                                                                                                         
  125. innodb_strict_mode                                 OFF                                                                                                                       
  126. innodb_support_xa                                  ON                                                                                                                        
  127. innodb_sync_spin_loops                             30                                                                                                                        
  128. innodb_table_locks                                 ON                                                                                                                        
  129. innodb_thread_concurrency                          0                                                                                                                         
  130. innodb_thread_sleep_delay                          10000                                                                                                                     
  131. innodb_use_native_aio                              ON                                                                                                                        
  132. innodb_use_sys_malloc                              ON                                                                                                                        
  133. innodb_version                                     5.5.36                                                                                                                    
  134. innodb_write_io_threads                            4                                                                                                                         
  135. insert_id                                          0                                                                                                                         
  136. interactive_timeout                                300                                                                                                                       
  137. join_buffer_size                                   8388608                                                                                                                   
  138. keep_files_on_create                               OFF                                                                                                                       
  139. key_buffer_size                                    33554432                                                                                                                  
  140. key_cache_age_threshold                            300                                                                                                                       
  141. key_cache_block_size                               1024                                                                                                                      
  142. key_cache_division_limit                           100                                                                                                                       
  143. large_files_support                                ON                                                                                                                        
  144. large_page_size                                    0                                                                                                                         
  145. large_pages                                        OFF                                                                                                                       
  146. last_insert_id                                     0                                                                                                                         
  147. lc_messages                                        en_US                                                                                                                     
  148. lc_messages_dir                                    /usr/share/mysql/                                                                                                         
  149. lc_time_names                                      en_US                                                                                                                     
  150. license                                            GPL                                                                                                                       
  151. local_infile                                       ON                                                                                                                        
  152. lock_wait_timeout                                  31536000                                                                                                                  
  153. locked_in_memory                                   OFF                                                                                                                       
  154. log                                                OFF                                                                                                                       
  155. log_bin                                            ON                                                                                                                        
  156. log_bin_trust_function_creators                    OFF                                                                                                                       
  157. log_error                                          /var/lib/mysql/VM84.err                                                                                                   
  158. log_output                                         FILE                                                                                                                      
  159. log_queries_not_using_indexes                      OFF                                                                                                                       
  160. log_slave_updates                                  OFF                                                                                                                       
  161. log_slow_queries                                   ON                                                                                                                        
  162. log_warnings                                       1                                                                                                                         
  163. long_query_time                                    2.000000                                                                                                                  
  164. low_priority_updates                               OFF                                                                                                                       
  165. lower_case_file_system                             OFF                                                                                                                       
  166. lower_case_table_names                             0                                                                                                                         
  167. max_allowed_packet                                 16777216                                                                                                                  
  168. max_binlog_cache_size                              18446744073709547520                                                                                                      
  169. max_binlog_size                                    1073741824                                                                                                                
  170. max_binlog_stmt_cache_size                         18446744073709547520                                                                                                      
  171. max_connect_errors                                 1024                                                                                                                      
  172. max_connections                                    2048                                                                                                                      
  173. max_delayed_threads                                20                                                                                                                        
  174. max_error_count                                    64                                                                                                                        
  175. max_heap_table_size                                67108864                                                                                                                  
  176. max_insert_delayed_threads                         20                                                                                                                        
  177. max_join_size                                      18446744073709551615                                                                                                      
  178. max_length_for_sort_data                           1024                                                                                                                      
  179. max_long_data_size                                 16777216                                                                                                                  
  180. max_prepared_stmt_count                            16382                                                                                                                     
  181. max_relay_log_size                                 0                                                                                                                         
  182. max_seeks_for_key                                  18446744073709551615                                                                                                      
  183. max_sort_length                                    1024                                                                                                                      
  184. max_sp_recursion_depth                             0                                                                                                                         
  185. max_tmp_tables                                     32                                                                                                                        
  186. max_user_connections                               0                                                                                                                         
  187. max_write_lock_count                               18446744073709551615                                                                                                      
  188. metadata_locks_cache_size                          1024                                                                                                                      
  189. min_examined_row_limit                             0                                                                                                                         
  190. multi_range_count                                  256                                                                                                                       
  191. myisam_data_pointer_size                           6                                                                                                                         
  192. myisam_max_sort_file_size                          21474836480                                                                                                               
  193. myisam_mmap_size                                   18446744073709551615                                                                                                      
  194. myisam_recover_options                             DEFAULT                                                                                                                   
  195. myisam_repair_threads                              1                                                                                                                         
  196. myisam_sort_buffer_size                            536870912                                                                                                                 
  197. myisam_stats_method                                nulls_unequal                                                                                                             
  198. myisam_use_mmap                                    OFF                                                                                                                       
  199. net_buffer_length                                  16384                                                                                                                     
  200. net_read_timeout                                   30                                                                                                                        
  201. net_retry_count                                    10                                                                                                                        
  202. net_write_timeout                                  60                                                                                                                        
  203. new                                                OFF                                                                                                                       
  204. old                                                OFF                                                                                                                       
  205. old_alter_table                                    OFF                                                                                                                       
  206. old_passwords                                      OFF                                                                                                                       
  207. open_files_limit                                   65535                                                                                                                     
  208. optimizer_prune_level                              1                                                                                                                         
  209. optimizer_search_depth                             62                                                                                                                        
  210. optimizer_switch                                   index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on    
  211. performance_schema                                 OFF                                                                                                                       
  212. performance_schema_events_waits_history_long_size  10000                                                                                                                     
  213. performance_schema_events_waits_history_size       10                                                                                                                        
  214. performance_schema_max_cond_classes                80                                                                                                                        
  215. performance_schema_max_cond_instances              1000                                                                                                                      
  216. performance_schema_max_file_classes                50                                                                                                                        
  217. performance_schema_max_file_handles                32768                                                                                                                     
  218. performance_schema_max_file_instances              10000                                                                                                                     
  219. performance_schema_max_mutex_classes               200                                                                                                                       
  220. performance_schema_max_mutex_instances             1000000                                                                                                                   
  221. performance_schema_max_rwlock_classes              30                                                                                                                        
  222. performance_schema_max_rwlock_instances            1000000                                                                                                                   
  223. performance_schema_max_table_handles               100000                                                                                                                    
  224. performance_schema_max_table_instances             50000                                                                                                                     
  225. performance_schema_max_thread_classes              50                                                                                                                        
  226. performance_schema_max_thread_instances            1000                                                                                                                      
  227. pid_file                                           /var/run/mysqld/mysqld.pid                                                                                                
  228. plugin_dir                                         /usr/lib64/mysql/plugin/                                                                                                  
  229. port                                               3306                                                                                                                      
  230. preload_buffer_size                                32768                                                                                                                     
  231. profiling                                          OFF                                                                                                                       
  232. profiling_history_size                             15                                                                                                                        
  233. protocol_version                                   10                                                                                                                        
  234. proxy_user                                                                                                                                                                   
  235. pseudo_slave_mode                                  OFF                                                                                                                       
  236. pseudo_thread_id                                   2634591                                                                                                                   
  237. query_alloc_block_size                             8192                                                                                                                      
  238. query_cache_limit                                  2097152                                                                                                                   
  239. query_cache_min_res_unit                           4096                                                                                                                      
  240. query_cache_size                                   67108864                                                                                                                  
  241. query_cache_type                                   ON                                                                                                                        
  242. query_cache_wlock_invalidate                       OFF                                                                                                                       
  243. query_prealloc_size                                8192                                                                                                                      
  244. rand_seed1                                         0                                                                                                                         
  245. rand_seed2                                         0                                                                                                                         
  246. range_alloc_block_size                             4096                                                                                                                      
  247. read_buffer_size                                   2097152                                                                                                                   
  248. read_only                                          OFF                                                                                                                       
  249. read_rnd_buffer_size                               16777216                                                                                                                  
  250. relay_log                                                                                                                                                                    
  251. relay_log_index                                                                                                                                                              
  252. relay_log_info_file                                relay-log.info                                                                                                            
  253. relay_log_purge                                    ON                                                                                                                        
  254. relay_log_recovery                                 OFF                                                                                                                       
  255. relay_log_space_limit                              0                                                                                                                         
  256. report_host                                                                                                                                                                  
  257. report_password                                                                                                                                                              
  258. report_port                                        3306                                                                                                                      
  259. report_user                                                                                                                                                                  
  260. rpl_recovery_rank                                  0                                                                                                                         
  261. secure_auth                                        OFF                                                                                                                       
  262. secure_file_priv                                                                                                                                                             
  263. server_id                                          84                                                                                                                        
  264. skip_external_locking                              ON                                                                                                                        
  265. skip_name_resolve                                  ON                                                                                                                        
  266. skip_networking                                    OFF                                                                                                                       
  267. skip_show_database                                 OFF                                                                                                                       
  268. slave_compressed_protocol                          OFF                                                                                                                       
  269. slave_exec_mode                                    STRICT                                                                                                                    
  270. slave_load_tmpdir                                  /tmp                                                                                                                      
  271. slave_max_allowed_packet                           1073741824                                                                                                                
  272. slave_net_timeout                                  3600                                                                                                                      
  273. slave_skip_errors                                  1032,1062                                                                                                                 
  274. slave_transaction_retries                          10                                                                                                                        
  275. slave_type_conversions                                                                                                                                                       
  276. slow_launch_time                                   2                                                                                                                         
  277. slow_query_log                                     ON                                                                                                                        
  278. slow_query_log_file                                /var/lib/mysql/VM84-slow.log                                                                                              
  279. socket                                             /var/lib/mysql/mysql.sock                                                                                                 
  280. sort_buffer_size                                   8388608                                                                                                                   
  281. sql_auto_is_null                                   OFF                                                                                                                       
  282. sql_big_selects                                    ON                                                                                                                        
  283. sql_big_tables                                     OFF                                                                                                                       
  284. sql_buffer_result                                  OFF                                                                                                                       
  285. sql_log_bin                                        ON                                                                                                                        
  286. sql_log_off                                        OFF                                                                                                                       
  287. sql_low_priority_updates                           OFF                                                                                                                       
  288. sql_max_join_size                                  18446744073709551615                                                                                                      
  289. sql_mode                                                                                                                                                                     
  290. sql_notes                                          ON                                                                                                                        
  291. sql_quote_show_create                              ON                                                                                                                        
  292. sql_safe_updates                                   OFF                                                                                                                       
  293. sql_select_limit                                   18446744073709551615                                                                                                      
  294. sql_slave_skip_counter                             0                                                                                                                         
  295. sql_warnings                                       OFF                                                                                                                       
  296. ssl_ca                                                                                                                                                                       
  297. ssl_capath                                                                                                                                                                   
  298. ssl_cert                                                                                                                                                                     
  299. ssl_cipher                                                                                                                                                                   
  300. ssl_key                                                                                                                                                                      
  301. storage_engine                                     InnoDB                                                                                                                    
  302. stored_program_cache                               256                                                                                                                       
  303. sync_binlog                                        0                                                                                                                         
  304. sync_frm                                           ON                                                                                                                        
  305. sync_master_info                                   0                                                                                                                         
  306. sync_relay_log                                     0                                                                                                                         
  307. sync_relay_log_info                                0                                                                                                                         
  308. system_time_zone                                   CST                                                                                                                       
  309. table_definition_cache                             400                                                                                                                       
  310. table_open_cache                                   2048                                                                                                                      
  311. thread_cache_size                                  8                                                                                                                         
  312. thread_concurrency                                 16                                                                                                                        
  313. thread_handling                                    one-thread-per-connection                                                                                                 
  314. thread_stack                                       262144                                                                                                                    
  315. time_format                                        %H:%i:%s                                                                                                                  
  316. time_zone                                          SYSTEM                                                                                                                    
  317. timed_mutexes                                      OFF                                                                                                                       
  318. timestamp                                          1408104399                                                                                                                
  319. tmp_table_size                                     67108864                                                                                                                  
  320. tmpdir                                             /tmp                                                                                                                      
  321. transaction_alloc_block_size                       8192                                                                                                                      
  322. transaction_prealloc_size                          4096                                                                                                                      
  323. tx_isolation                                       REPEATABLE-READ                                                                                                           
  324. unique_checks                                      ON                                                                                                                        
  325. updatable_views_with_limit                         YES                                                                                                                       
  326. version                                            5.5.36-log                                                                                                                
  327. version_comment                                    MySQL Community Server (GPL) by Remi                                                                                      
  328. version_compile_machine                            x86_64                                                                                                                    
  329. version_compile_os                                 Linux                                                                                                                     
  330. wait_timeout                                       28800                                                                                                                     
  331. warning_count                                      0                                                                                                                         
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