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doc: concurrency of gc delete-range #18117

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Aug 21, 2024
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doc: concurrency of gc delete-range #18117

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doc: concurrency of gc delete-range
ekexium Jul 25, 2024
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Update system-variables.md
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9 changes: 7 additions & 2 deletions system-variables.md
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Expand Up @@ -2574,9 +2574,14 @@ v5.0 后，用户仍可以单独修改以上系统变量（会有废弃警告）
- 是否受 Hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value) 控制：否
- 类型：整数型
- 默认值：`-1`
- 范围：`[1, 256]`
- 范围：`-1` 或 `[1, 256]`
- 单位：线程
- 这个变量用于指定 GC 在[Resolve Locks（清理锁）](/garbage-collection-overview.md#resolve-locks清理锁)步骤中线程的数量。默认值 `-1` 表示由 TiDB 自主判断运行 GC 要使用的线程的数量。
- 该变量用于控制[垃圾回收 (GC)](/garbage-collection-overview.md) 过程中 [Resolve Locks（清理锁）](/garbage-collection-overview.md#resolve-locks清理锁)的并发线程数。
- 从 v8.3.0 开始，该变量也用于控制 GC 过程中 [Delete Range（删除区间）](/garbage-collection-overview.md#delete-ranges删除区间)的并发线程数。
- 默认情况下，该变量值为 `-1`，TiDB 将根据负载情况自动决定适当的线程数。
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- 当设置为 `[1, 256]` 之间的数时：
- Resolve Locks（清理锁）直接使用该变量设定值作为线程数。
- Delete Range（删除区间）使用该变量设定值的 1/4 作为线程数。

### `tidb_gc_enable` <span class="version-mark">从 v5.0 版本开始引入</span>

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