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system-variables: remove the default value descriptions for last_xxx variables #19982

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Mar 6, 2025
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system-variables: remove the default value descriptions for last_xxx variables #19982

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4 changes: 1 addition & 3 deletions system-variables.md
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Expand Up @@ -570,22 +570,20 @@ mysql> SELECT * FROM t1;
- 作用域：SESSION
- 是否受 Hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value) 控制：否
- 类型：布尔型
- 默认值：`OFF`
- 该变量用来显示上一条执行的语句所使用的执行计划是否来自 binding 的[执行计划](/sql-plan-management.md)。

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

- 作用域：SESSION
- 是否受 Hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value) 控制：否
- 类型：布尔型
- 默认值：`OFF`
- 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_sql_use_alloc` <span class="version-mark">从 v6.4.0 版本开始引入</span>

- 作用域：SESSION
- 是否受 Hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value) 控制：否
- 默认值：`OFF`
- 类型：布尔型
- 这个变量是一个只读变量，用来显示上一个语句是否使用了缓存的 Chunk 对象 (Chunk allocation)。

### `license`
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