24、MySQL 8.0 5.1.5服務器系統變量

MySQL服務器維護許多系統變量，指出它如何配置。每個系統變量都有一個默認值。可以在服務器啓動時使用命令行上的選項或選項文件來設置系統變量。它們中的大多數可以在運行時使用該SET 語句動態更改 ，這使您可以修改服務器的操作，而無需停止並重新啓動它。您也可以在表達式中使用系統變量值。

在運行時，設置系統變量的全局值通常需要SYSTEM_VARIABLES_ADMIN or SUPER權限，而個別變量描述中則指定了異常。對於某些系統變量，設置會話值還需要sme權限; 再次，個別變量描述中有例外情況。

有幾種方法可以查看系統變量的名稱和值：

要查看服務器將基於其編譯的默認值以及它讀取的任何選項文件使用的值，請使用以下命令：
mysqld --verbose --help
要根據其編譯的默認值查看服務器將使用的值，忽略任何選項文件中的設置，請使用以下命令：
mysqld --no-defaults --verbose --help
要查看正在運行的服務器使用的當前值，請使用該 SHOW VARIABLES語句或Performance Schema系統變量表。請參見 第26.11.13節“性能模式系統變量表”。
本部分包含一個列出所有系統變量的表格，下表提供了每個變量的描述。所有MySQL 8.0版本都提供沒有指定版本的變量。有關操作系統變量的更多信息，請參見第5.1.6節“使用系統變量”。

表5.2系統變量摘要

Name Cmd-Line Option File System Var Var Scope Dynamic
activate_all_roles_on_login Yes Yes Yes Global Yes
auto_generate_certs Yes Yes Yes Global No
auto_increment_increment Yes Both Yes
auto_increment_offset Yes Both Yes
autocommit Yes Yes Yes Both Yes
automatic_sp_privileges Yes Global Yes
avoid_temporal_upgrade Yes Yes Yes Global Yes
back_log Yes Global No
basedir Yes Yes Yes Global No
big-tables Yes Yes Yes
- Variable: big_tables Yes Both Yes
bind-address Yes Yes No
- Variable: bind_address Yes Global No
binlog_cache_size Yes Yes Yes Global Yes
binlog_checksum Yes Global Yes
binlog_direct_non_transactional_updates Yes Yes Yes Both Yes
binlog_error_action Yes Yes Yes Global Yes
binlog_expire_logs_seconds Yes Yes Yes Global Yes
binlog-format Yes Yes Yes
- Variable: binlog_format Yes Both Yes
binlog_group_commit_sync_delay Yes Yes Yes Global Yes
binlog_group_commit_sync_no_delay_count Yes Yes Yes Global Yes
binlog_gtid_simple_recovery Yes Yes Yes Global No
binlog_max_flush_queue_time Yes Global Yes
binlog_order_commits Yes Global Yes
binlog_row_image Yes Yes Yes Both Yes
binlog_row_metadata Yes Yes Yes Global Yes
binlog_row_value_options Yes Yes Yes Both Yes
binlog_rows_query_log_events Yes Yes Yes Both Yes
binlog_stmt_cache_size Yes Yes Yes Global Yes
binlog_transaction_dependency_history_size Yes Yes Yes Global Yes
binlog_transaction_dependency_tracking Yes Yes Yes Global Yes
block_encryption_mode Yes Yes Yes Both Yes
bulk_insert_buffer_size Yes Yes Yes Both Yes
caching_sha2_password_auto_generate_rsa_keys Yes Yes Yes Global No
caching_sha2_password_private_key_path Yes Yes Yes Global No
caching_sha2_password_public_key_path Yes Yes Yes Global No
character_set_client Yes Both Yes
character_set_connection Yes Both Yes
character_set_database (note 1) Yes Both Yes
character-set-filesystem Yes Yes Yes
- Variable: character_set_filesystem Yes Both Yes
character_set_results Yes Both Yes
character-set-server Yes Yes Yes
- Variable: character_set_server Yes Both Yes
character_set_system Yes Global No
character-sets-dir Yes Yes No
- Variable: character_sets_dir Yes Global No
check_proxy_users Yes Yes Yes Global Yes
collation_connection Yes Both Yes
collation_database (note 1) Yes Both Yes
collation-server Yes Yes Yes
- Variable: collation_server Yes Both Yes
completion_type Yes Yes Yes Both Yes
concurrent_insert Yes Yes Yes Global Yes
connect_timeout Yes Yes Yes Global Yes
connection_control_failed_connections_threshold Yes Yes Yes Global Yes
connection_control_max_connection_delay Yes Yes Yes Global Yes
connection_control_min_connection_delay Yes Yes Yes Global Yes
core_file Yes Global No
cte_max_recursion_depth Yes Yes Yes Both Yes
daemon_memcached_enable_binlog Yes Yes Yes Global No
daemon_memcached_engine_lib_name Yes Yes Yes Global No
daemon_memcached_engine_lib_path Yes Yes Yes Global No
daemon_memcached_option Yes Yes Yes Global No
daemon_memcached_r_batch_size Yes Yes Yes Global No
daemon_memcached_w_batch_size Yes Yes Yes Global No
datadir Yes Yes Yes Global No
date_format Yes Global No
datetime_format Yes Global No
debug Yes Yes Yes Both Yes
debug_sync Yes Session Yes
default_authentication_plugin Yes Yes Yes Global No
default_collation_for_utf8mb4 Yes Yes Yes Both Yes
default_password_lifetime Yes Yes Yes Global Yes
default-storage-engine Yes Yes Yes
- Variable: default_storage_engine Yes Both Yes
default_tmp_storage_engine Yes Yes Yes Both Yes
default_week_format Yes Yes Yes Both Yes
delay-key-write Yes Yes Yes
- Variable: delay_key_write Yes Global Yes
delayed_insert_limit Yes Yes Yes Global Yes
delayed_insert_timeout Yes Yes Yes Global Yes
delayed_queue_size Yes Yes Yes Global Yes
disabled_storage_engines Yes Yes Yes Global No
disconnect_on_expired_password Yes Yes Yes Session No
div_precision_increment Yes Yes Yes Both Yes
dragnet.log_error_filter_rules Yes Yes Yes Global Yes
end_markers_in_json Yes Both Yes
enforce-gtid-consistency Yes Yes Yes Global Yes
enforce_gtid_consistency Yes Yes Yes Global Yes
eq_range_index_dive_limit Yes Both Yes
error_count Yes Session No
event-scheduler Yes Yes Yes
- Variable: event_scheduler Yes Global Yes
executed_gtids_compression_period Yes Global Yes
expire_logs_days Yes Yes Yes Global Yes
explicit_defaults_for_timestamp Yes Yes Yes Both Yes
external_user Yes Session No
flush Yes Yes Yes Global Yes
flush_time Yes Yes Yes Global Yes
foreign_key_checks Yes Both Yes
ft_boolean_syntax Yes Yes Yes Global Yes
ft_max_word_len Yes Yes Yes Global No
ft_min_word_len Yes Yes Yes Global No
ft_query_expansion_limit Yes Yes Yes Global No
ft_stopword_file Yes Yes Yes Global No
general-log Yes Yes Yes
- Variable: general_log Yes Global Yes
general_log_file Yes Yes Yes Global Yes
group_concat_max_len Yes Yes Yes Both Yes
group_replication_allow_local_disjoint_gtids_join Yes Yes Yes Global Yes
group_replication_allow_local_lower_version_join Yes Yes Yes Global Yes
group_replication_auto_increment_increment Yes Yes Yes Global Yes
group_replication_bootstrap_group Yes Yes Yes Global Yes
group_replication_communication_debug_options Yes Yes Yes Global Yes
group_replication_components_stop_timeout Yes Yes Yes Global Yes
group_replication_compression_threshold Yes Yes Yes Global Yes
group_replication_enforce_update_everywhere_checks Yes Yes Yes Global Yes
group_replication_flow_control_applier_threshold Yes Yes Yes Global Yes
group_replication_flow_control_certifier_threshold Yes Yes Yes Global Yes
group_replication_flow_control_hold_percent Yes Yes Yes Global Yes
group_replication_flow_control_max_commit_quota Yes Yes Yes
- Variable: group_replication_flow_control_min_quota Yes Global Yes
group_replication_flow_control_member_quota_percent Yes Yes Yes Global Yes
group_replication_flow_control_min_quota Yes Yes Yes Global Yes
group_replication_flow_control_min_recovery_quota Yes Yes Yes Global Yes
group_replication_flow_control_mode Yes Yes Yes Global Yes
group_replication_flow_control_period Yes Yes Yes Global Yes
group_replication_flow_control_release_percent Yes Yes Yes Global Yes
group_replication_force_members Yes Yes Yes Global Yes
group_replication_group_name Yes Yes Yes Global Yes
group_replication_group_seeds Yes Yes Yes Global Yes
group_replication_gtid_assignment_block_size Yes Yes Yes Global Yes
group_replication_ip_whitelist Yes Yes Yes Global Yes
group_replication_local_address Yes Yes Yes Global Yes
group_replication_member_weight Yes Yes Yes Global Yes
group_replication_poll_spin_loops Yes Yes Yes Global Yes
group_replication_recovery_complete_at Yes Yes Yes Global Yes
group_replication_recovery_get_public_key Yes Yes Yes Global Yes
group_replication_recovery_public_key_path Yes Yes Yes Global Yes
group_replication_recovery_reconnect_interval Yes Yes Yes Global Yes
group_replication_recovery_retry_count Yes Yes Yes Global Yes
group_replication_recovery_ssl_ca Yes Yes Yes Global Yes
group_replication_recovery_ssl_capath Yes Yes Yes Global Yes
group_replication_recovery_ssl_cert Yes Yes Yes Global Yes
group_replication_recovery_ssl_cipher Yes Yes Yes Global Yes
group_replication_recovery_ssl_crl Yes Yes Yes Global Yes
group_replication_recovery_ssl_crlpath Yes Yes Yes Global Yes
group_replication_recovery_ssl_key Yes Yes Yes Global Yes
group_replication_recovery_ssl_verify_server_cert Yes Yes Yes Global Yes
group_replication_recovery_use_ssl Yes Yes Yes Global Yes
group_replication_single_primary_mode Yes Yes Yes Global Yes
group_replication_ssl_mode Yes Yes Yes Global Yes
group_replication_start_on_boot Yes Yes Yes Global Yes
group_replication_transaction_size_limit Yes Yes Yes Global Yes
group_replication_unreachable_majority_timeout Yes Yes Yes Global Yes
gtid_executed Yes Varies No
gtid_executed_compression_period Yes Global Yes
gtid-mode Yes Yes Yes
- Variable: gtid_mode Yes Global Yes
gtid_mode Yes Global Yes
gtid_next Yes Session Yes
gtid_owned Yes Both No
gtid_purged Yes Global Yes
have_compress Yes Global No
have_crypt Yes Global No
have_dynamic_loading Yes Global No
have_geometry Yes Global No
have_openssl Yes Global No
have_profiling Yes Global No
have_query_cache Yes Global No
have_rtree_keys Yes Global No
have_ssl Yes Global No
have_statement_timeout Yes Global No
have_symlink Yes Global No
histogram_generation_max_mem_size Yes Yes Yes Both Yes
host_cache_size Yes Global Yes
hostname Yes Global No
identity Yes Session Yes
ignore-builtin-innodb Yes Yes No
- Variable: ignore_builtin_innodb Yes Global No
information_schema_stats_expiry Yes Yes Yes Session Yes
init_connect Yes Yes Yes Global Yes
init-file Yes Yes No
- Variable: init_file Yes Global No
init_slave Yes Yes Yes Global Yes
innodb_adaptive_flushing Yes Yes Yes Global Yes
innodb_adaptive_flushing_lwm Yes Yes Yes Global Yes
innodb_adaptive_hash_index Yes Yes Yes Global Yes
innodb_adaptive_hash_index_parts Yes Yes Yes Global No
innodb_adaptive_max_sleep_delay Yes Yes Yes Global Yes
innodb_api_bk_commit_interval Yes Yes Yes Global Yes
innodb_api_disable_rowlock Yes Yes Yes Global No
innodb_api_enable_binlog Yes Yes Yes Global No
innodb_api_enable_mdl Yes Yes Yes Global No
innodb_api_trx_level Yes Yes Yes Global Yes
innodb_autoextend_increment Yes Yes Yes Global Yes
innodb_autoinc_lock_mode Yes Yes Yes Global No
innodb_background_drop_list_empty Yes Yes Yes Global Yes
innodb_buffer_pool_chunk_size Yes Yes Yes Global No
innodb_buffer_pool_debug Yes Yes Yes Global No
innodb_buffer_pool_dump_at_shutdown Yes Yes Yes Global Yes
innodb_buffer_pool_dump_now Yes Yes Yes Global Yes
innodb_buffer_pool_dump_pct Yes Yes Yes Global Yes
innodb_buffer_pool_filename Yes Yes Yes Global Yes
innodb_buffer_pool_instances Yes Yes Yes Global No
innodb_buffer_pool_load_abort Yes Yes Yes Global Yes
innodb_buffer_pool_load_at_startup Yes Yes Yes Global No
innodb_buffer_pool_load_now Yes Yes Yes Global Yes
innodb_buffer_pool_size Yes Yes Yes Global Yes
innodb_change_buffer_max_size Yes Yes Yes Global Yes
innodb_change_buffering Yes Yes Yes Global Yes
innodb_change_buffering_debug Yes Yes Yes Global Yes
innodb_checkpoint_disabled Yes Yes Yes Global Yes
innodb_checksum_algorithm Yes Yes Yes Global Yes
innodb_cmp_per_index_enabled Yes Yes Yes Global Yes
innodb_commit_concurrency Yes Yes Yes Global Yes
innodb_compress_debug Yes Yes Yes Global Yes
innodb_compression_failure_threshold_pct Yes Yes Yes Global Yes
innodb_compression_level Yes Yes Yes Global Yes
innodb_compression_pad_pct_max Yes Yes Yes Global Yes
innodb_concurrency_tickets Yes Yes Yes Global Yes
innodb_data_file_path Yes Yes Yes Global No
innodb_data_home_dir Yes Yes Yes Global No
innodb_ddl_log_crash_reset_debug Yes Yes Yes Global Yes
innodb_deadlock_detect Yes Yes Yes Global Yes
innodb_dedicated_server Yes Yes Yes Global No
innodb_default_row_format Yes Yes Yes Global Yes
innodb_directories Yes Yes Yes Global No
innodb_disable_sort_file_cache Yes Yes Yes Global Yes
innodb_doublewrite Yes Yes Yes Global No
innodb_fast_shutdown Yes Yes Yes Global Yes
innodb_fil_make_page_dirty_debug Yes Yes Yes Global Yes
innodb_file_per_table Yes Yes Yes Global Yes
innodb_fill_factor Yes Yes Yes Global Yes
innodb_flush_log_at_timeout Yes Global Yes
innodb_flush_log_at_trx_commit Yes Yes Yes Global Yes
innodb_flush_method Yes Yes Yes Global No
innodb_flush_neighbors Yes Yes Yes Global Yes
innodb_flush_sync Yes Yes Yes Global Yes
innodb_flushing_avg_loops Yes Yes Yes Global Yes
innodb_force_load_corrupted Yes Yes Yes Global No
innodb_force_recovery Yes Yes Yes Global No
innodb_ft_aux_table Yes Yes Yes Global Yes
innodb_ft_cache_size Yes Yes Yes Global No
innodb_ft_enable_diag_print Yes Yes Yes Global Yes
innodb_ft_enable_stopword Yes Yes Yes Global Yes
innodb_ft_max_token_size Yes Yes Yes Global No
innodb_ft_min_token_size Yes Yes Yes Global No
innodb_ft_num_word_optimize Yes Yes Yes Global Yes
innodb_ft_result_cache_limit Yes Yes Yes Global Yes
innodb_ft_server_stopword_table Yes Yes Yes Global Yes
innodb_ft_sort_pll_degree Yes Yes Yes Global No
innodb_ft_total_cache_size Yes Yes Yes Global No
innodb_ft_user_stopword_table Yes Yes Yes Both Yes
innodb_io_capacity Yes Yes Yes Global Yes
innodb_io_capacity_max Yes Yes Yes Global Yes
innodb_limit_optimistic_insert_debug Yes Yes Yes Global Yes
innodb_lock_wait_timeout Yes Yes Yes Both Yes
innodb_log_buffer_size Yes Yes Yes Global Varies
innodb_log_checksums Yes Yes Yes Global Yes
innodb_log_compressed_pages Yes Yes Yes Global Yes
innodb_log_file_size Yes Yes Yes Global No
innodb_log_files_in_group Yes Yes Yes Global No
innodb_log_group_home_dir Yes Yes Yes Global No
innodb_log_spin_cpu_abs_lwm Yes Yes Yes Global Yes
innodb_log_spin_cpu_pct_hwm Yes Yes Yes Global Yes
innodb_log_wait_for_flush_spin_hwm Yes Yes Yes Global Yes
innodb_log_write_ahead_size Yes Yes Yes Global Yes
innodb_lru_scan_depth Yes Yes Yes Global Yes
innodb_max_dirty_pages_pct Yes Yes Yes Global Yes
innodb_max_dirty_pages_pct_lwm Yes Yes Yes Global Yes
innodb_max_purge_lag Yes Yes Yes Global Yes
innodb_max_purge_lag_delay Yes Yes Yes Global Yes
innodb_max_undo_log_size Yes Yes Yes Global Yes
innodb_merge_threshold_set_all_debug Yes Yes Yes Global Yes
innodb_monitor_disable Yes Yes Yes Global Yes
innodb_monitor_enable Yes Yes Yes Global Yes
innodb_monitor_reset Yes Yes Yes Global Yes
innodb_monitor_reset_all Yes Yes Yes Global Yes
innodb_numa_interleave Yes Yes Yes Global No
innodb_old_blocks_pct Yes Yes Yes Global Yes
innodb_old_blocks_time Yes Yes Yes Global Yes
innodb_online_alter_log_max_size Yes Yes Yes Global Yes
innodb_open_files Yes Yes Yes Global No
innodb_optimize_fulltext_only Yes Yes Yes Global Yes
innodb_page_cleaners Yes Yes Yes Global No
innodb_page_size Yes Yes Yes Global No
innodb_print_all_deadlocks Yes Yes Yes Global Yes
innodb_print_ddl_logs Yes Yes Yes Global Yes
innodb_purge_batch_size Yes Yes Yes Global Yes
innodb_purge_rseg_truncate_frequency Yes Yes Yes Global Yes
innodb_purge_threads Yes Yes Yes Global No
innodb_random_read_ahead Yes Yes Yes Global Yes
innodb_read_ahead_threshold Yes Yes Yes Global Yes
innodb_read_io_threads Yes Yes Yes Global No
innodb_read_only Yes Yes Yes Global No
innodb_redo_log_encrypt Yes Yes Yes Global Yes
innodb_replication_delay Yes Yes Yes Global Yes
innodb_rollback_on_timeout Yes Yes Yes Global No
innodb_rollback_segments Yes Yes Yes Global Yes
innodb_saved_page_number_debug Yes Yes Yes Global Yes
innodb_scan_directories Yes Yes Yes Global No
innodb_sort_buffer_size Yes Yes Yes Global No
innodb_spin_wait_delay Yes Yes Yes Global Yes
innodb_stats_auto_recalc Yes Yes Yes Global Yes
innodb_stats_include_delete_marked Yes Yes Yes Global Yes
innodb_stats_method Yes Yes Yes Global Yes
innodb_stats_on_metadata Yes Yes Yes Global Yes
innodb_stats_persistent Yes Yes Yes Global Yes
innodb_stats_persistent_sample_pages Yes Yes Yes Global Yes
innodb_stats_transient_sample_pages Yes Yes Yes Global Yes
innodb_status_output Yes Yes Yes Global Yes
innodb_status_output_locks Yes Yes Yes Global Yes
innodb_strict_mode Yes Yes Yes Both Yes
innodb_sync_array_size Yes Yes Yes Global No
innodb_sync_debug Yes Yes Yes Global No
innodb_sync_spin_loops Yes Yes Yes Global Yes
innodb_table_locks Yes Yes Yes Both Yes
innodb_temp_data_file_path Yes Yes Yes Global No
innodb_thread_concurrency Yes Yes Yes Global Yes
innodb_thread_sleep_delay Yes Yes Yes Global Yes
innodb_tmpdir Yes Yes Yes Both Yes
innodb_trx_purge_view_update_only_debug Yes Yes Yes Global Yes
innodb_trx_rseg_n_slots_debug Yes Yes Yes Global Yes
innodb_undo_directory Yes Yes Yes Global No
innodb_undo_log_encrypt Yes Yes Yes Global Yes
innodb_undo_log_truncate Yes Yes Yes Global Yes
innodb_undo_logs Yes Yes Yes Global Yes
innodb_undo_tablespaces Yes Yes Yes Global Varies
innodb_use_native_aio Yes Yes Yes Global No
innodb_version Yes Global No
innodb_write_io_threads Yes Yes Yes Global No
insert_id Yes Session Yes
interactive_timeout Yes Yes Yes Both Yes
internal_tmp_disk_storage_engine Yes Yes Yes Global Yes
internal_tmp_mem_storage_engine Yes Yes Yes Session Yes
join_buffer_size Yes Yes Yes Both Yes
keep_files_on_create Yes Yes Yes Both Yes
key_buffer_size Yes Yes Yes Global Yes
key_cache_age_threshold Yes Yes Yes Global Yes
key_cache_block_size Yes Yes Yes Global Yes
key_cache_division_limit Yes Yes Yes Global Yes
keyring_file_data Yes Yes Yes Global Yes
keyring_operations Yes Global Yes
language Yes Yes Yes Global No
large_files_support Yes Global No
large_page_size Yes Global No
large-pages Yes Yes No
- Variable: large_pages Yes Global No
last_insert_id Yes Session Yes
lc-messages Yes Yes Yes
- Variable: lc_messages Yes Both Yes
lc-messages-dir Yes Yes No
- Variable: lc_messages_dir Yes Global No
lc_time_names Yes Both Yes
license Yes Global No
local_infile Yes Global Yes
lock_wait_timeout Yes Yes Yes Both Yes
locked_in_memory Yes Global No
log-bin Yes Yes Yes Global No
log_bin Yes Global No
log_bin_basename Yes Global No
log_bin_index Yes Global No
log-bin-trust-function-creators Yes Yes Yes
- Variable: log_bin_trust_function_creators Yes Global Yes
log-bin-use-v1-row-events Yes Yes No
- Variable: log_bin_use_v1_row_events Yes Global No
log_bin_use_v1_row_events Yes Yes Yes Global No
log_builtin_as_identified_by_password Yes Yes Yes Global Yes
log-error Yes Yes No
- Variable: log_error Yes Global No
log_error_filter_rules Yes Yes Yes Global Yes
log_error_services Yes Yes Yes Global Yes
log_error_verbosity Yes Yes Yes Global Yes
log-output Yes Yes Yes
- Variable: log_output Yes Global Yes
log-queries-not-using-indexes Yes Yes Yes
- Variable: log_queries_not_using_indexes Yes Global Yes
log-slave-updates Yes Yes No
- Variable: log_slave_updates Yes Global No
log_slave_updates Yes Yes Yes Global No
log_slow_admin_statements Yes Global Yes
log_slow_slave_statements Yes Global Yes
log_statements_unsafe_for_binlog Yes Global Yes
log_syslog Yes Yes Yes Global Yes
log_syslog_facility Yes Yes Yes Global Yes
log_syslog_include_pid Yes Yes Yes Global Yes
log_syslog_tag Yes Yes Yes Global Yes
log_throttle_queries_not_using_indexes Yes Global Yes
log_timestamps Yes Yes Yes Global Yes
log-warnings Yes Yes Yes
- Variable: log_warnings Yes Global Yes
long_query_time Yes Yes Yes Both Yes
low-priority-updates Yes Yes Yes
- Variable: low_priority_updates Yes Both Yes
lower_case_file_system Yes Global No
lower_case_table_names Yes Yes Yes Global No
mandatory_roles Yes Yes Yes Global Yes
master_info_repository Yes Yes Yes Global Yes
master_verify_checksum Yes Global Yes
max_allowed_packet Yes Yes Yes Both Yes
max_binlog_cache_size Yes Yes Yes Global Yes
max_binlog_size Yes Yes Yes Global Yes
max_binlog_stmt_cache_size Yes Yes Yes Global Yes
max_connect_errors Yes Yes Yes Global Yes
max_connections Yes Yes Yes Global Yes
max_delayed_threads Yes Yes Yes Both Yes
max_digest_length Yes Yes Yes Global No
max_error_count Yes Yes Yes Both Yes
max_execution_time Yes Yes Yes Both Yes
max_heap_table_size Yes Yes Yes Both Yes
max_insert_delayed_threads Yes Both Yes
max_join_size Yes Yes Yes Both Yes
max_length_for_sort_data Yes Yes Yes Both Yes
max_points_in_geometry Yes Yes Yes Both Yes
max_prepared_stmt_count Yes Yes Yes Global Yes
max_relay_log_size Yes Yes Yes Global Yes
max_seeks_for_key Yes Yes Yes Both Yes
max_sort_length Yes Yes Yes Both Yes
max_sp_recursion_depth Yes Yes Yes Both Yes
max_tmp_tables Yes Both Yes
max_user_connections Yes Yes Yes Both Yes
max_write_lock_count Yes Yes Yes Global Yes
mecab_rc_file Yes Yes Yes Global No
metadata_locks_cache_size Yes Global No
metadata_locks_hash_instances Yes Global No
min-examined-row-limit Yes Yes Yes Both Yes
multi_range_count Yes Yes Yes Both Yes
myisam_data_pointer_size Yes Yes Yes Global Yes
myisam_max_sort_file_size Yes Yes Yes Global Yes
myisam_mmap_size Yes Yes Yes Global No
myisam_recover_options Yes Global No
myisam_repair_threads Yes Yes Yes Both Yes
myisam_sort_buffer_size Yes Yes Yes Both Yes
myisam_stats_method Yes Yes Yes Both Yes
myisam_use_mmap Yes Yes Yes Global Yes
mysql_native_password_proxy_users Yes Yes Yes Global Yes
mysqlx-bind-address Yes Yes Yes Global No
mysqlx_bind_address Yes Yes Yes Global No
mysqlx-connect-timeout Yes Yes Yes Global Yes
mysqlx_connect_timeout Yes Yes Yes Global Yes
mysqlx_document_id_unique_prefix Yes Yes Yes Global Yes
mysqlx-idle-worker-thread-timeout Yes Yes Yes Global Yes
mysqlx_idle_worker_thread_timeout Yes Yes Yes Global Yes
mysqlx-interactive-timeout Yes Yes Yes Global Yes
mysqlx_interactive_timeout Yes Yes Yes Global Yes
mysqlx-max-allowed-packet Yes Yes Yes Global Yes
mysqlx_max_allowed_packet Yes Yes Yes Global Yes
mysqlx-max-connections Yes Yes Yes Global Yes
mysqlx_max_connections Yes Yes Yes Global Yes
mysqlx-min-worker-threads Yes Yes Yes Global Yes
mysqlx_min_worker_threads Yes Yes Yes Global Yes
mysqlx-port Yes Yes Yes Global No
mysqlx_port Yes Yes Yes Global No
mysqlx-port-open-timeout Yes Yes Yes Global No
mysqlx_port_open_timeout Yes Yes Yes Global No
mysqlx-read-timeout Yes Yes Yes Session Yes
mysqlx_read_timeout Yes Yes Yes Session Yes
mysqlx-socket Yes Yes Yes Global No
mysqlx_socket Yes Yes Yes Global No
mysqlx-ssl Yes Yes Yes Global No
mysqlx-ssl-ca Yes Yes Yes Global No
mysqlx-ssl-capath Yes Yes Yes Global No
mysqlx-ssl-cert Yes Yes Yes Global No
mysqlx-ssl-crl Yes Yes Yes Global No
mysqlx-ssl-crlpath Yes Yes Yes Global No
mysqlx-ssl-key Yes Yes Yes Global No
mysqlx-wait-timeout Yes Yes Yes Session Yes
mysqlx_wait_timeout Yes Yes Yes Session Yes
mysqlx-write-timeout Yes Yes Yes Session Yes
mysqlx_write_timeout Yes Yes Yes Session Yes
named_pipe Yes Global No
ndb-batch-size Yes Yes Yes Global No
ndb-blob-write-batch-bytes Yes Yes Yes Both Yes
ndb-cluster-connection-pool Yes Yes Yes Global No
ndb-cluster-connection-pool-nodeids Yes Yes Yes Global No
ndb-deferred-constraints Yes Yes Yes
- Variable: ndb_deferred_constraints Yes Both Yes
ndb_deferred_constraints Yes Yes Yes Both Yes
ndb-distribution Yes Yes Yes
- Variable: ndb_distribution Yes Global Yes
ndb_distribution Yes Yes Yes Global Yes
ndb_eventbuffer_free_percent Yes Yes Yes Global Yes
ndb_eventbuffer_max_alloc Yes Yes Yes Global Yes
ndb_force_send Yes Yes Yes Both Yes
ndb_index_stat_enable Yes Yes Yes Both Yes
ndb_index_stat_option Yes Yes Yes Both Yes
ndb_join_pushdown Yes Both Yes
ndb-log-apply-status Yes Yes No
- Variable: ndb_log_apply_status Yes Global No
ndb_log_apply_status Yes Yes Yes Global No
ndb_log_binlog_index Yes Yes Global Yes
ndb-log-empty-epochs Yes Yes Yes Global Yes
ndb-log-empty-update Yes Yes Yes Global Yes
ndb-log-transaction-id Yes Yes No
- Variable: ndb_log_transaction_id Yes Global No
ndb_log_updated_only Yes Yes Yes Global Yes
ndb_optimization_delay Yes Global Yes
ndb_optimized_node_selection Yes Yes Yes Global No
ndb_recv_thread_cpu_mask Yes Global Yes
ndb_report_thresh_binlog_epoch_slip Yes Yes Yes Global Yes
ndb_report_thresh_binlog_mem_usage Yes Yes Yes Global Yes
ndb_show_foreign_key_mock_tables Yes Yes Yes Global Yes
Ndb_slave_max_replicated_epoch Yes Global No
ndb_table_no_logging Yes Session Yes
ndb_use_transactions Yes Yes Yes Both Yes
ndb_version Yes Global No
ndb_version_string Yes Global No
ndb-wait-setup Yes Yes Yes Global No
ndbinfo_database Yes Global No
ndbinfo_max_rows Yes Yes Both Yes
ndbinfo_show_hidden Yes Yes Both Yes
ndbinfo_version Yes Global No
net_buffer_length Yes Yes Yes Both Yes
net_read_timeout Yes Yes Yes Both Yes
net_retry_count Yes Yes Yes Both Yes
net_write_timeout Yes Yes Yes Both Yes
new Yes Yes Yes Both Yes
ngram_token_size Yes Yes Yes Global No
offline_mode Yes Yes Yes Global Yes
old Yes Yes Yes Global No
old-alter-table Yes Yes Yes
- Variable: old_alter_table Yes Both Yes
old_passwords Yes Both Yes
open-files-limit Yes Yes No
- Variable: open_files_limit Yes Global No
optimizer_prune_level Yes Yes Yes Both Yes
optimizer_search_depth Yes Yes Yes Both Yes
optimizer_switch Yes Yes Yes Both Yes
optimizer_trace Yes Both Yes
optimizer_trace_features Yes Both Yes
optimizer_trace_limit Yes Both Yes
optimizer_trace_max_mem_size Yes Both Yes
optimizer_trace_offset Yes Both Yes
parser_max_mem_size Yes Yes Yes Both Yes
password_history Yes Yes Yes Global Yes
password_reuse_interval Yes Yes Yes Global Yes
performance_schema Yes Yes Yes Global No
performance_schema_accounts_size Yes Yes Yes Global No
performance_schema_digests_size Yes Yes Yes Global No
performance_schema_error_size Yes Yes Yes Global No
performance_schema_events_stages_history_long_size Yes Yes Yes Global No
performance_schema_events_stages_history_size Yes Yes Yes Global No
performance_schema_events_statements_history_long_size Yes Yes Yes Global No
performance_schema_events_statements_history_size Yes Yes Yes Global No
performance_schema_events_transactions_history_long_size Yes Yes Yes Global No
performance_schema_events_transactions_history_size Yes Yes Yes Global No
performance_schema_events_waits_history_long_size Yes Yes Yes Global No
performance_schema_events_waits_history_size Yes Yes Yes Global No
performance_schema_hosts_size Yes Yes Yes Global No
performance_schema_max_cond_classes Yes Yes Yes Global No
performance_schema_max_cond_instances Yes Yes Yes Global No
performance_schema_max_digest_length Yes Yes Yes Global No
performance_schema_max_digest_sample_age Yes Yes Yes Global Yes
performance_schema_max_file_classes Yes Yes Yes Global No
performance_schema_max_file_handles Yes Yes Yes Global No
performance_schema_max_file_instances Yes Yes Yes Global No
performance_schema_max_index_stat Yes Yes Yes Global No
performance_schema_max_memory_classes Yes Yes Yes Global No
performance_schema_max_metadata_locks Yes Yes Yes Global No
performance_schema_max_mutex_classes Yes Yes Yes Global No
performance_schema_max_mutex_instances Yes Yes Yes Global No
performance_schema_max_prepared_statements_instances Yes Yes Yes Global No
performance_schema_max_program_instances Yes Yes Yes Global No
performance_schema_max_rwlock_classes Yes Yes Yes Global No
performance_schema_max_rwlock_instances Yes Yes Yes Global No
performance_schema_max_socket_classes Yes Yes Yes Global No
performance_schema_max_socket_instances Yes Yes Yes Global No
performance_schema_max_sql_text_length Yes Yes Yes Global No
performance_schema_max_stage_classes Yes Yes Yes Global No
performance_schema_max_statement_classes Yes Yes Yes Global No
performance_schema_max_statement_stack Yes Yes Yes Global No
performance_schema_max_table_handles Yes Yes Yes Global No
performance_schema_max_table_instances Yes Yes Yes Global No
performance_schema_max_table_lock_stat Yes Yes Yes Global No
performance_schema_max_thread_classes Yes Yes Yes Global No
performance_schema_max_thread_instances Yes Yes Yes Global No
performance_schema_session_connect_attrs_size Yes Yes Yes Global No
performance_schema_setup_actors_size Yes Yes Yes Global No
performance_schema_setup_objects_size Yes Yes Yes Global No
performance_schema_users_size Yes Yes Yes Global No
persisted_globals_load Yes Yes Yes Global No
pid-file Yes Yes No
- Variable: pid_file Yes Global No
plugin_dir Yes Yes Yes Global No
port Yes Yes Yes Global No
preload_buffer_size Yes Yes Yes Both Yes
profiling Yes Both Yes
profiling_history_size Yes Yes Yes Both Yes
protocol_version Yes Global No
proxy_user Yes Session No
pseudo_slave_mode Yes Session Yes
pseudo_thread_id Yes Session Yes
query_alloc_block_size Yes Yes Yes Both Yes
query_cache_limit Yes Yes Yes Global Yes
query_cache_min_res_unit Yes Yes Yes Global Yes
query_cache_size Yes Yes Yes Global Yes
query_cache_type Yes Yes Yes Both Yes
query_cache_wlock_invalidate Yes Yes Yes Both Yes
query_prealloc_size Yes Yes Yes Both Yes
rand_seed1 Yes Session Yes
rand_seed2 Yes Session Yes
range_alloc_block_size Yes Yes Yes Both Yes
range_optimizer_max_mem_size Yes Yes Yes Both Yes
rbr_exec_mode Yes Session Yes
read_buffer_size Yes Yes Yes Both Yes
read_only Yes Yes Yes Global Yes
read_rnd_buffer_size Yes Yes Yes Both Yes
regexp_stack_limit Yes Yes Yes Global Yes
regexp_time_limit Yes Yes Yes Global Yes
relay-log Yes Yes No
- Variable: relay_log Yes Global No
relay_log_basename Yes Global No
relay-log-index Yes Yes No
- Variable: relay_log_index Yes Global No
relay_log_index Yes Yes Yes Global No
relay_log_info_file Yes Yes Yes Global No
relay_log_info_repository Yes Global Yes
relay_log_purge Yes Yes Yes Global Yes
relay_log_recovery Yes Yes Yes Global No
relay_log_space_limit Yes Yes Yes Global No
report-host Yes Yes No
- Variable: report_host Yes Global No
report-password Yes Yes No
- Variable: report_password Yes Global No
report-port Yes Yes No
- Variable: report_port Yes Global No
report-user Yes Yes No
- Variable: report_user Yes Global No
require_secure_transport Yes Yes Yes Global Yes
resultset_metadata Yes Session Yes
rewriter_enabled Yes Global Yes
rewriter_verbose Yes Global Yes
rpl_read_size Yes Yes Yes Global Yes
rpl_semi_sync_master_enabled Yes Global Yes
rpl_semi_sync_master_timeout Yes Global Yes
rpl_semi_sync_master_trace_level Yes Global Yes
rpl_semi_sync_master_wait_for_slave_count Yes Global Yes
rpl_semi_sync_master_wait_no_slave Yes Global Yes
rpl_semi_sync_master_wait_point Yes Global Yes
rpl_semi_sync_slave_enabled Yes Global Yes
rpl_semi_sync_slave_trace_level Yes Global Yes
rpl_stop_slave_timeout Yes Yes Yes Global Yes
schema_definition_cache Yes Yes Yes Global Yes
secure-auth Yes Yes Yes
- Variable: secure_auth Yes Global Yes
secure-file-priv Yes Yes No
- Variable: secure_file_priv Yes Global No
server-id Yes Yes Yes
- Variable: server_id Yes Global Yes
server_uuid Yes Global No
session_track_gtids Yes Yes Yes Both Yes
session_track_schema Yes Yes Yes Both Yes
session_track_state_change Yes Yes Yes Both Yes
session_track_system_variables Yes Yes Yes Both Yes
sha256_password_auto_generate_rsa_keys Yes Yes Yes Global No
sha256_password_private_key_path Yes Yes Yes Global No
sha256_password_proxy_users Yes Yes Yes Global Yes
sha256_password_public_key_path Yes Yes Yes Global No
shared_memory Yes Yes Yes Global No
shared_memory_base_name Yes Yes Yes Global No
show_compatibility_56 Yes Yes Yes Global Yes
show_create_table_verbosity Yes Yes Yes Both Yes
show_old_temporals Yes Yes Yes Both Yes
simplified_binlog_gtid_recovery Yes Yes Yes Global No
skip_external_locking Yes Yes Yes Global No
skip-name-resolve Yes Yes No
- Variable: skip_name_resolve Yes Global No
skip-networking Yes Yes No
- Variable: skip_networking Yes Global No
skip-show-database Yes Yes No
- Variable: skip_show_database Yes Global No
slave_allow_batching Yes Yes Yes Global Yes
slave_checkpoint_group Yes Yes Yes Global Yes
slave_checkpoint_period Yes Yes Yes Global Yes
slave_compressed_protocol Yes Yes Yes Global Yes
slave_exec_mode Yes Yes Yes Global Yes
slave-load-tmpdir Yes Yes No
- Variable: slave_load_tmpdir Yes Global No
slave_max_allowed_packet Yes Global Yes
slave-net-timeout Yes Yes Yes
- Variable: slave_net_timeout Yes Global Yes
slave_parallel_type Yes Global Yes
slave_parallel_workers Yes Yes Global Yes
slave_pending_jobs_size_max Yes Global Yes
slave_preserve_commit_order Yes Yes Global Yes
slave_rows_search_algorithms Yes Global Yes
slave-skip-errors Yes Yes No
- Variable: slave_skip_errors Yes Global No
slave_sql_verify_checksum Yes Global Yes
slave_transaction_retries Yes Yes Yes Global Yes
slave_type_conversions Yes Yes Yes Global No
slow_launch_time Yes Yes Yes Global Yes
slow-query-log Yes Yes Yes
- Variable: slow_query_log Yes Global Yes
slow_query_log_file Yes Yes Yes Global Yes
socket Yes Yes Yes Global No
sort_buffer_size Yes Yes Yes Both Yes
sql_auto_is_null Yes Both Yes
sql_big_selects Yes Both Yes
sql_buffer_result Yes Both Yes
sql_log_bin Yes Session Yes
sql_log_off Yes Both Yes
sql-mode Yes Yes Yes
- Variable: sql_mode Yes Both Yes
sql_notes Yes Both Yes
sql_quote_show_create Yes Both Yes
sql_safe_updates Yes Both Yes
sql_select_limit Yes Both Yes
sql_slave_skip_counter Yes Global Yes
sql_warnings Yes Both Yes
ssl-ca Yes Yes No
- Variable: ssl_ca Yes Global No
ssl-capath Yes Yes No
- Variable: ssl_capath Yes Global No
ssl-cert Yes Yes No
- Variable: ssl_cert Yes Global No
ssl-cipher Yes Yes No
- Variable: ssl_cipher Yes Global No
ssl-crl Yes Yes No
- Variable: ssl_crl Yes Global No
ssl-crlpath Yes Yes No
- Variable: ssl_crlpath Yes Global No
ssl-key Yes Yes No
- Variable: ssl_key Yes Global No
stored_program_cache Yes Yes Yes Global Yes
stored_program_definition_cache Yes Yes Yes Global Yes
super_read_only Yes Yes Yes Global Yes
sync_binlog Yes Yes Yes Global Yes
sync_master_info Yes Yes Yes Global Yes
sync_relay_log Yes Yes Yes Global Yes
sync_relay_log_info Yes Yes Yes Global Yes
system_time_zone Yes Global No
table_definition_cache Yes Global Yes
table_open_cache Yes Global Yes
table_open_cache_instances Yes Global No
tablespace_definition_cache Yes Yes Yes Global Yes
temptable_max_ram Yes Yes Yes Global Yes
thread_cache_size Yes Yes Yes Global Yes
thread_handling Yes Yes Yes Global No
thread_stack Yes Yes Yes Global No
time_format Yes Global No
time_zone Yes Both Yes
timestamp Yes Session Yes
tls_version Yes Yes Yes Global No
tmp_table_size Yes Yes Yes Both Yes
tmpdir Yes Yes Yes Global No
transaction_alloc_block_size Yes Yes Yes Both Yes
transaction_allow_batching Yes Session Yes
transaction-isolation Yes Yes Yes
- Variable: transaction_isolation Yes Both Yes
transaction_prealloc_size Yes Yes Yes Both Yes
transaction-read-only Yes Yes Yes
- Variable: transaction_read_only Yes Both Yes
transaction_write_set_extraction Yes Yes Both Yes
tx_isolation Yes Both Yes
tx_read_only Yes Both Yes
unique_checks Yes Both Yes
updatable_views_with_limit Yes Yes Yes Both Yes
validate_password_check_user_name Yes Yes Yes Global Yes
validate_password_dictionary_file Yes Global Yes
validate_password_length Yes Global Yes
validate_password_mixed_case_count Yes Global Yes
validate_password_number_count Yes Global Yes
validate_password_policy Yes Global Yes
validate_password_special_char_count Yes Global Yes
validate_password.check_user_name Yes Yes Yes Global Yes
validate_password.dictionary_file Yes Global Yes
validate_password.length Yes Global Yes
validate_password.mixed_case_count Yes Global Yes
validate_password.number_count Yes Global Yes
validate_password.policy Yes Global Yes
validate_password.special_char_count Yes Global Yes
validate_user_plugins Yes Global No
version Yes Global No
version_comment Yes Global No
version_compile_machine Yes Global No
version_compile_os Yes Global No
version_compile_zlib Yes Global No
version_tokens_session Yes Yes Yes Both Yes
version_tokens_session_number Yes Yes Yes Both No
wait_timeout Yes Yes Yes Both Yes
warning_count Yes Session No

windowing_use_high_precision Yes Yes Yes Both Yes

注意

以下一些變量描述涉及 “ 啓用 ”或“ 禁用 ”變量。可以通過將這些變量SET 設置爲ON或 來啓用這些變量1，或者通過將它們設置爲OFF或來禁用 這些變量 0。布爾變量可以在啓動時被設置爲的值 ON，TRUE， OFF，和FALSE（不區分大小寫），以及1和 0。

一些系統變量控制緩衝區或緩存的大小。對於給定的緩衝區，服務器可能需要分配內部數據結構。這些結構通常是從分配給緩衝區的總內存中分配的，而所需的空間量可能與平臺有關。這意味着，當您爲控制緩衝區大小的系統變量賦值時，實際可用的空間量可能與指定的值不同。在某些情況下，金額可能小於指定的金額。服務器也可能會向上調整一個值。例如，如果將值0賦予最小值爲1024的變量，則服務器將將該值設置爲1024。

除非另有說明，緩衝區大小，長度和堆棧大小的值以字節爲單位給出。

一些系統變量採用文件名稱值。除非另有說明，否則如果該值是相對路徑名稱，則默認文件位置是數據目錄。要明確指定位置，請使用絕對路徑名稱。假設數據目錄是/var/mysql/data。如果文件值變量是作爲相對路徑名給出的，它將位於下方 /var/mysql/data。如果該值是絕對路徑名，則其位置如路徑名所示。

• activate_all_roles_on_login

  屬性	值
  命令行格式	--activate-all-roles-on-login
  介紹	8.0.2
  系統變量	activate_all_roles_on_login
  範圍	全球
  動態	是
  SET_VAR提示應用	沒有
  類型	布爾
  默認	OFF

  是否在用戶登錄服務器時啓用所有授權角色的自動激活：

  • 如果 activate_all_roles_on_login 啓用，服務器會在登錄時激活授予每個帳戶的所有角色。這優先於使用指定的默認角色SET DEFAULT ROLE。

  • 如果 activate_all_roles_on_login 禁用，則服務器SET DEFAULT ROLE在登錄時激活使用（如果有的話）指定的默認角色。

  授予的角色包括明確授予用戶的角色和mandatory_roles系統變量值中指定的角色 。

  activate_all_roles_on_login 僅適用於登錄時，以及在定義上下文中執行的存儲程序和視圖的執行開始時。要更改會話中的活動角色，請使用 SET ROLE。要更改存儲程序的活動角色，程序主體應該執行 SET ROLE。

• autocommit

  屬性	值
  命令行格式	--autocommit[=#]
  系統變量	autocommit
  範圍	全球，會議
  動態	是
  SET_VAR提示應用	沒有
  類型	布爾
  默認	ON

  自動提交模式。如果設置爲1，則對錶的所有更改立即生效。如果設置爲0，則必須使用 COMMIT接受事務或ROLLBACK 取消事務。如果autocommit 爲0，並將其更改爲1，則MySQL會自動執行 COMMIT任何打開的事務。開始交易的另一種方式是使用一個START TRANSACTION或 一個 BEGIN 語句。

  默認情況下，客戶端連接開始時 autocommit設置爲1.要使客戶端以默認值0 autocommit開始，請使用--autocommit=0選項啓動服務器來設置全局 值 。要使用選項文件設置變量，請包含以下行：

  [mysqld]
  autocommit=0

• automatic_sp_privileges

  屬性	值
  系統變量	automatic_sp_privileges
  範圍	全球
  動態	是
  SET_VAR提示應用	沒有
  類型	布爾
  默認	TRUE

  當該變量具有1（默認值）的一個值時，服務器自動授予 EXECUTE和 ALTER ROUTINE特權一個存儲程序的創建者，如果用戶已經不能執行和變更或刪除該程序。（ ALTER ROUTINE需要特權才能刪除例程。）當例程被刪除時，服務器也會自動從創建者那裏刪除這些特權。如果 automatic_sp_privileges爲0，則服務器不會自動添加或刪除這些權限。

  例程的創建者是用於爲其執行CREATE語句的帳戶 。這可能與DEFINER在例程定義中以名稱命名的帳戶 不同。本文由學什麼技術好