原创 mysql top sql 查看
###語句兼容mysql 5.6 ,5.7,8.0 ###top 10 sql: SELECT SCHEMA_NAME, DIGEST_TEXT, COUNT_STAR, sys.format_time
原创 mysql 高負載下限流參數:Innodb_concurrency_tickets And Innodb_thread_concurrency
The two settings --innodb-thread-concurrency and --innodb-concurrency-tickets work together to help control how much wo
原创 Oracle AFD 18c Supported Platforms
ACFS and AFD 18c Supported Platforms Vendor Version Update/Kernel Architecture ACFS Bug or RU/RUR AF
原创 oracle AFD 19c Supported Platforms
ACFS and AFD 19c Supported Platforms Vendor Version Update/Kernel Architecture ACFS Bug or RU/RUR AFD
原创 mysql 5.6 以後版本union all 操作優化
mysql 5.6 vs 5.7 vs 8.0 版本優化器參數對比: mysql 5.6.42@@optimizer_switch: index_merge=on,index_merge_union=on,index_merge_sor
原创 Oracle AFD 12.2.0.1 Supported Platforms
ACFS and AFD 12.2.0.1 Supported Platforms Vendor Version Update/Kernel Architecture ACFS Bug or PS
原创 RHEL7.X MySQL 5.7.X 數據庫 標準建議 安裝手冊
MySQL Expert REVIEW RHEL7.X MySQL 5.7.X 數據庫 安裝手冊 目 錄 系統需求... 1 安裝方式... 1 介質準備... 1 mysql 用
原创 Diagnosing MySQL Server Freezes and Stalls, Sometimes Called Crashes
Diagnosing MySQL Server Freezes and Stalls, Sometimes Called Crashes 轉到底部 In this Document Purpose T
原创 mysql 自增鍵的上限後異常處理
一般情況下對於自增鍵 會使用 int ,自增鍵上限 :2的32次方 -1(4294967295) 達到自增上限後,數據就無法繼續插入,報“ERROR 1062 (23000): Duplicate entry '4294967295'
原创 檢查oracle 表統計信息是否過期
--刷新數據庫監控信息: exec dbms_stats.flush_database_monitoring_info; --過期狀態查看:stale_stats 狀態是否爲“YES” select owner,table_name,ob
原创 mysql internal: ALTER TABLE ... IMPORT TABLESPACE 操作原理
When ALTER TABLE ... IMPORT TABLESPACE is run on the destination instance, the import algorithm performs the following
原创 Database Startup On Solaris 10 Fails With Ora-27102 Out Of Memory Error (Doc ID 399895.1)
Database Startup On Solaris 10 Fails With Ora-27102 Out Of Memory Error (Doc ID 399895.1) To Bottom APPLIES TO:
原创 mysql ibd 數據文件恢復極速恢復工具 ibd recover tool
mysql ibd 數據文件恢復極速恢復 最近不少朋友遇到mysql 丟失ibddata 數據文件或者文件系統損壞只有部分ibd 文件的故障找我來幫忙處理,有些朋友的環境有幾百上千個ibd 文件,手動恢復着實麻煩,寫了一個工具,批量恢復m