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Add/clarify SQL length limits #16172

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Jan 22, 2024
Merged

Add/clarify SQL length limits #16172

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c3d0481
translate-docs-pr#15602
pushmeintheair Jan 12, 2024
7b06cb5
Update dashboard/dashboard-slow-query.md
pushmeintheair Jan 21, 2024
5560254
Update system-variables.md
pushmeintheair Jan 21, 2024
128f8dc
Update system-variables.md
hfxsd Jan 22, 2024
d6e3fa9
Update dashboard/dashboard-slow-query.md
hfxsd Jan 22, 2024
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4 changes: 4 additions & 0 deletions dashboard/dashboard-slow-query.md
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Expand Up @@ -60,6 +60,10 @@ aliases: ['/docs-cn/dev/dashboard/dashboard-slow-query/']

### SQL

>**注意：**
>
> 记录在 `Query` 中的查询的长度会受到 [`tidb_stmt_summary_max_sql_length`](/system-variables.md#tidb_stmt_summary_max_sql_length-从-v40-版本开始引入) 系统变量的限制。

点击**展开** (**Expand**) 可以展开相应项的完整内容，点击**复制** (**Copy**) 可以复制内容到剪贴板。

### 执行计划
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6 changes: 3 additions & 3 deletions information-schema/information-schema-slow-query.md
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Expand Up @@ -202,9 +202,9 @@ DESC SELECT COUNT(*) FROM CLUSTER_SLOW_QUERY WHERE user = 'u1';
| id | estRows | task | access object | operator info |
+----------------------------+----------+-----------+--------------------------+------------------------------------------------------+
| StreamAgg_7 | 1.00 | root | | funcs:count(1)->Column#75 |
| └─TableReader_13 | 10.00 | root | | data:Selection_12 |
| └─Selection_12 | 10.00 | cop[tidb] | | eq(INFORMATION_SCHEMA.cluster_slow_query.user, "u1") |
| └─TableFullScan_11 | 10000.00 | cop[tidb] | table:CLUSTER_SLOW_QUERY | keep order:false, stats:pseudo |
| └─TableReader_13 | 10.00 | root | | data:Selection_12 |
| └─Selection_12 | 10.00 | cop[tidb] | | eq(INFORMATION_SCHEMA.cluster_slow_query.user, "u1") |
| └─TableFullScan_11 | 10000.00 | cop[tidb] | table:CLUSTER_SLOW_QUERY | keep order:false, stats:pseudo |
+----------------------------+----------+-----------+--------------------------+------------------------------------------------------+
4 rows in set (0.00 sec)
```
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2 changes: 1 addition & 1 deletion system-variables.md
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Expand Up @@ -4475,7 +4475,7 @@ Query OK, 0 rows affected, 1 warning (0.00 sec)
- 类型：整数型
- 默认值：`4096`
- 范围：`[0, 2147483647]`
- 这个变量控制 [statement summary tables](/statement-summary-tables.md) 显示的 SQL 字符串长度。
- 这个变量用来控制 [Statement Summary Tables](/statement-summary-tables.md)、[`SLOW_QUERY`](/information-schema/information-schema-slow-query.md) 表和 [TiDB Dashboard](/dashboard/dashboard-intro.md) 中显示的 SQL 字符串长度。

### `tidb_stmt_summary_max_stmt_count` <span class="version-mark">从 v4.0 版本开始引入</span>

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