Skip to content

tidb_row_checksum(): Update docs (#17491) #17498

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

Merged
merged 2 commits into from
May 31, 2024
Merged

tidb_row_checksum(): Update docs (#17491) #17498

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
0fff11d
initial tran
hfxsd May 31, 2024
32e3fcf
Update functions-and-operators/tidb-functions.md
hfxsd May 31, 2024
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
6 changes: 4 additions & 2 deletions functions-and-operators/tidb-functions.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -312,12 +312,14 @@ select tidb_decode_sql_digests(@digests, 10);
SET GLOBAL tidb_enable_row_level_checksum = ON;
```

上述配置仅对新创建的会话生效，因此需要重新连接 TiDB。

创建表 `t` 并插入数据：

```sql
USE test;
CREATE TABLE t (id INT PRIMARY KEY, k INT, c int);
INSERT INTO TABLE t values (1, 10, a);
CREATE TABLE t (id INT PRIMARY KEY, k INT, c CHAR(1));
INSERT INTO t values (1, 10, 'a');
```

查询表 `t` 中 `id = 1` 的行数据的 Checksum 值：
Expand Down
1 change: 1 addition & 0 deletions system-variables.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2439,6 +2439,7 @@ Query OK, 0 rows affected (0.09 sec)
- 类型：布尔型
- 默认值：`OFF`
- 这个变量用于控制是否开启 [TiCDC 单行数据正确性校验](/ticdc/ticdc-integrity-check.md)功能。
- 你可以使用 [`TIDB_ROW_CHECKSUM()`](/functions-and-operators/tidb-functions.md#tidb_row_checksum) 函数查询行数据的 Checksum 值。

### `tidb_enforce_mpp` <span class="version-mark">从 v5.1 版本开始引入</span>

Expand Down