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Revert "Add description on admin pause ddl jobs and admin resume ddl jobs" #14078

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May 30, 2023
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Revert "Add description on admin pause ddl jobs and admin resume ddl jobs" #14078

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9b354da
Revert "Add description on `admin pause ddl jobs` and `admin resume d…
Oreoxmt May 30, 2023
f087ae7
update basic-features and release notes
Oreoxmt May 30, 2023
2ae8d4c
fix format
Oreoxmt May 30, 2023
d499e56
remove descriptions in smooth upgrade
ran-huang May 30, 2023
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1 change: 0 additions & 1 deletion basic-features.md
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Expand Up @@ -124,7 +124,6 @@ aliases: ['/docs-cn/dev/basic-features/','/docs-cn/dev/experimental-features-4.0
| [添加索引加速](/system-variables.md#tidb_ddl_enable_fast_reorg-从-v630-版本开始引入) | Y | Y | N | N | N | N | N | N | N |
| [元数据锁](/metadata-lock.md) | Y | Y | N | N | N | N | N | N | N |
| [`FLASHBACK CLUSTER TO TIMESTAMP`](/sql-statements/sql-statement-flashback-to-timestamp.md) | Y | Y | N | N | N | N | N | N | N |
| [暂停/恢复 DDL](/ddl-introduction.md#ddl-相关的命令介绍) | E | N | N | N | N | N | N | N | N |

## 事务

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10 changes: 1 addition & 9 deletions ddl-introduction.md
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Expand Up @@ -176,15 +176,7 @@ absent -> delete only -> write only -> write reorg -> public

- `ADMIN CANCEL DDL JOBS job_id [, job_id]`：用于取消已经提交但未执行完成的 DDL 任务。取消完成后，执行 DDL 任务的 SQL 语句会返回 `ERROR 8214 (HY000): Cancelled DDL job` 错误。

取消一个已经执行完成的 DDL 任务会在 `RESULT` 列看到 `DDL Job:90 not found` 的错误，表示该任务已从 DDL 等待队列中被移除。

- `ADMIN PAUSE DDL JOBS job_id [, job_id]`：用于暂停正在执行的 DDL 任务。执行该命令后，执行 DDL 任务的 SQL 语句体现为正在执行，后台任务暂停执行。（实验特性）

只有处于执行中或仍在等待中的 DDL 任务可以暂停，否则会在 `RESULT` 列看到 `Job 3 can't be paused now`。

- `ADMIN RESUME DDL JOBS job_id [, job_id]`：用于恢复已被暂停的 DDL 任务。执行该命令后，执行 DDL 任务的 SQL 语句体现为正在执行，后台任务正常执行。（实验特性）

你只能对暂停状态的 DDL 任务进行恢复操作，否则会在 `RESULT` 列看到 `Job 3 can't be resumed`。
取消一个已经执行完成的 DDL 任务会在 RESULT 列看到 `DDL Job:90 not found` 的错误，表示该任务已从 DDL 等待队列中被移除。
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## 常见问题

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15 changes: 0 additions & 15 deletions releases/release-7.1.0.md
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Expand Up @@ -154,21 +154,6 @@ TiDB 版本：7.1.0 (upcoming)

更多信息，请参考[用户文档](/generated-columns.md)。

### 数据库管理

* DDL 任务支持暂停和恢复操作（实验特性）[#18015](https://github.com/pingcap/tidb/issues/18015) @[godouxm](https://github.com/godouxm)

TiDB v7.1.0 之前的版本中，当 DDL 任务执行期间遇到业务高峰时间点时，为了减少对业务的影响，只能手动取消 DDL 任务。TiDB v7.1.0 引入了 DDL 任务的暂停和恢复功能，你可以在高峰时间点暂停 DDL 任务，等到业务高峰时间结束后再恢复 DDL 任务，从而避免了 DDL 操作对业务负载的影响。

例如，可以通过如下 `ADMIN PAUSE DDL JOBS` 或 `ADMIN RESUME DDL JOBS` 语句暂停或者恢复多个 DDL 任务：

```sql
ADMIN PAUSE DDL JOBS 1,2;
ADMIN RESUME DDL JOBS 1,2;
```

更多信息，请参考[用户文档](/ddl-introduction.md#ddl-相关的命令介绍)。

### 可观测性

* 增加优化器诊断信息 [#43122](https://github.com/pingcap/tidb/issues/43122) @[time-and-fate](https://github.com/time-and-fate)
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