3.5 状态图 以下是MySQL Undo项目的状态图,用于展示Undo操作的状态变化: UndoEnabledQueryExecutedUndoRequiredRollbackCommit 4. 总结 本项目提出了一个MySQL Undo打开的方案,通过配置Undo日志的相关参数来打开Undo功能,并提供了使用Undo日志进行撤销和回滚操作的示例代码。希望本方案能够帮助用户正确配置和使用MySQL的Undo...
MAXQUERYLENIdentifies the length of the longest query (in seconds) executed in the instance during the period. You can use this statistic to estimate the proper setting of the UNDO_RETENTION initialization parameter. The length of a query is measured from the cursor open time to the last fetch...
MAXQUERYLENIdentifies the length of the longest query (in seconds) executed in the instance during the period. You can use this statistic to estimate the proper setting of the UNDO_RETENTION initialization parameter. The length of a query is measured from the cursor open time to the last fetch...
mysql的binlog文件中记录的是对数据库的各种修改操作, 用来表示修改操作的数据结构是 log event, 不同的修改操作对应的不同的log event 比较常用的 log event 有: Query event, Row event, XID Event...
SQLQueryUnchecked SQLServerObjectExplorer SquareCap SSlash StackedAreaChart StackedAreaDashLineChart StackedBarChart StackedBarDashLineChart StackedColumnChart StackedColumnDashLineChart StackedLineChart StackPanel StartGraphicDiagnostics StartHierarchy StartLogging StartPoint StartTestGroupWithDebugger StartTestWithoutDe...
SQLQueryChecked SQLQueryUnchecked SQLServerObjectExplorer SquareCap SSlash StackedAreaChart StackedAreaDashLineChart StackedBarChart StackedBarDashLineChart StackedColumnChart StackedColumnDashLineChart StackedLineChart StackPanel StartGraphicDiagnostics StartHierarchy StartLogging StartPoint StartTestGroupWithDebugger ...
t_cid holds the command id (cid), which means how many SQL commands were executed before this command was executed within the current transaction beginning from 0. For example, assume that we execute three INSERT commands within a single transaction: 'BEGIN; INSERT; INSERT; INSERT; COMMIT;'....
mysql>showmaster status;+---+---+---+---+---+|File|Position|Binlog_Do_DB|Binlog_Ignore_DB|Executed_Gtid_Set|+---+---+---+---+---+|binlog.000745|155|||+---+---+---+---
MAXQUERYLENIdentifies the length of the longest query (in seconds) executed in the instance during the period. You can use this statistic to estimate the proper setting of the UNDO_RETENTION initialization parameter. The length of a query is measured from the cursor open time to the last fetch...
After the database has completed a workload cycle, you can view the Longest Running Query field on the System Activity subpage of the Automatic Undo Management page. The longest interval that you will require for Oracle Flashback operations ...