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add explaination about last_plan_from_binding (#3702) #4113

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Merged
ti-srebot merged 2 commits into from
Jul 30, 2020
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add explaination about last_plan_from_binding (#3702) #4113

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7f6d02f
cherry pick #3702 to release-4.0
Reminiscent Jul 30, 2020
2f31e4c
Merge branch 'release-4.0' into release-4.0-43b053119880
ti-srebot Jul 30, 2020
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8 changes: 8 additions & 0 deletions system-variables.md
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Expand Up @@ -60,6 +60,14 @@ SET GLOBAL tidb_distsql_scan_concurrency = 10;
- 默认值：0
- 这个变量用来显示上一个 `execute` 语句所使用的执行计划是不是直接从 plan cache 中取出来的。

### last_plan_from_binding <span class="version-mark">从 v4.0 版本开始引入</span>

作用域：SESSION

默认值：0

这个变量用来显示上一条执行的语句所使用的执行计划是不是来自 binding 的执行计划。

### `max_execution_time`

- 作用域：SESSION | GLOBAL
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