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v7.5.5: introduce tidb_ddl_reorg_max_write_speed #19282

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v7.5.5: introduce tidb_ddl_reorg_max_write_speed #19282

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2 changes: 1 addition & 1 deletion sql-statements/sql-statement-admin-alter-ddl.md
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Expand Up @@ -25,7 +25,7 @@ ADMIN ALTER DDL JOBS 101 THREAD = 8;
- `ADD INDEX`：
- `THREAD`：并发度，初始值由系统变量 `tidb_ddl_reorg_worker_cnt` 设置。
- `BATCH_SIZE`：批大小，初始值由系统变量 [`tidb_ddl_reorg_batch_size`](/system-variables.md#tidb_ddl_reorg_batch_size) 设置。
- `MAX_WRITE_SPEED`：向每个 TiKV 导入索引记录时的最大带宽限制，初始值由系统变量 [`tidb_ddl_reorg_max_write_speed`](/system-variables.md#tidb_ddl_reorg_max_write_speed-从-v850-版本开始引入) 设置。
- `MAX_WRITE_SPEED`：向每个 TiKV 导入索引记录时的最大带宽限制，初始值由系统变量 [`tidb_ddl_reorg_max_write_speed`](/system-variables.md#tidb_ddl_reorg_max_write_speed-从-v755-和-v850-版本开始引入) 设置。

以上设置，当前仅对关闭 [`tidb_enable_dist_task`](/system-variables.md#tidb_enable_dist_task-从-v710-版本开始引入) 后，提交并运行中的 `ADD INDEX` 的作业生效。

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2 changes: 1 addition & 1 deletion system-variables.md
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Expand Up @@ -1512,7 +1512,7 @@ mysql> SELECT job_info FROM mysql.analyze_jobs ORDER BY end_time DESC LIMIT 1;
- 可选值：`PRIORITY_LOW`、`PRIORITY_NORMAL`、`PRIORITY_HIGH`
- 这个变量用来设置 `ADD INDEX` 操作 `re-organize` 阶段的执行优先级，可设置为 `PRIORITY_LOW`/`PRIORITY_NORMAL`/`PRIORITY_HIGH`。

### `tidb_ddl_reorg_max_write_speed` <span class="version-mark">从 v8.5.0 版本开始引入</span>
### `tidb_ddl_reorg_max_write_speed` <span class="version-mark">从 v7.5.5 和 v8.5.0 版本开始引入</span>

- 作用域：GLOBAL
- 是否持久化到集群：是
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