Skip to content

v8.1.3: tidb: add description for var tidb_ddl_reorg_max_write_speed (#19071) #19258

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 9 commits into
base: release-8.1
Choose a base branch
from
+14 −0
Open

v8.1.3: tidb: add description for var tidb_ddl_reorg_max_write_speed (#19071) #19258

Changes from all commits
Commits
Show all changes
9 commits
Select commit Hold shift + click to select a range
101b6ed
tidb: add description for var `tidb_ddl_reorg_max_write_speed`
CbcWestwolf Nov 13, 2024
9f272b5
Update system-variables.md
CbcWestwolf Nov 14, 2024
28079af
Update system-variables.md
CbcWestwolf Nov 18, 2024
631dfa4
Update system-variables.md
CbcWestwolf Nov 18, 2024
40b6eef
Update system-variables.md
CbcWestwolf Nov 19, 2024
ab4217d
update
CbcWestwolf Nov 19, 2024
5b27dd9
Update system-variables.md
CbcWestwolf Nov 22, 2024
b8bc025
Update system-variables.md
CbcWestwolf Nov 26, 2024
13758e8
update
CbcWestwolf Jun 24, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
14 changes: 14 additions & 0 deletions system-variables.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1508,6 +1508,20 @@ 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 v6.5.12 和 v7.5.5 版本开始引入</span>
Copy link
Collaborator

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Suggested change
### `tidb_ddl_reorg_max_write_speed` <span class="version-mark">从 v6.5.12 和 v7.5.5 版本开始引入</span>
### `tidb_ddl_reorg_max_write_speed` <span class="version-mark">从 v6.5.12、v7.5.5 和 v8.1.3 版本开始引入</span>


- 作用域：GLOBAL
- 是否持久化到集群：是
- 是否受 Hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value) 控制：否
- 类型：字符串
- 默认值：`0`
- 范围：`[0, 1PiB]`
- 这个变量用于限制每个 TiKV 节点写入的带宽，仅在开启添加索引加速功能时生效（由变量 [`tidb_ddl_enable_fast_reorg`](#tidb_ddl_enable_fast_reorg-从-v630-版本开始引入) 控制）。在数据量特别大的情况下（如数十亿行数据），降低加索引时写入 TiKV 节点的带宽可以有效减少对业务负载的影响。
- 默认值 `0` 表示不限制写入带宽。
- 该变量可设置为带单位的格式或不带单位的格式。
- 当该变量值不带单位时，默认单位为字节每秒。例如 `67108864` 表示 `64MiB` 每秒。
- 当该变量值带单位时，支持的单位包括 KiB、MiB、GiB、TiB。例如，`'1GiB'` 表示 1 GiB 每秒， `'256MiB'` 表示 256 MiB 每秒。

### `tidb_ddl_reorg_worker_cnt`

- 作用域：GLOBAL
Expand Down
Loading