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partitioned tables: add some restrictions (#18290) #18306

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Aug 6, 2024
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partitioned tables: add some restrictions (#18290) #18306

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6 changes: 6 additions & 0 deletions partitioned-table.md
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Expand Up @@ -1450,6 +1450,12 @@ SELECT store_id, COUNT(department_id) AS c

本节介绍当前 TiDB 分区表的一些约束和限制。

- 不支持使用 [`ALTER TABLE ... CHANGE COLUMN`](/sql-statements/sql-statement-change-column.md) 语句更改分区表的列类型。
- 不支持使用 [`ALTER TABLE ... CACHE`](/cached-tables.md) 语句将分区表设为缓存表。
- 与 TiDB 的[临时表](/temporary-tables.md)功能不兼容。
- 不支持在分区表上创建[外键](/foreign-key.md)。
- [`ORDER_INDEX(t1_name, idx1_name [, idx2_name ...])`](/optimizer-hints.md#order_indext1_name-idx1_name--idx2_name-) Hint 对分区表及其相关索引不生效，因为分区表上的索引不支持按顺序读取。

### 分区键，主键和唯一键

本节讨论分区键，主键和唯一键之间的关系。一句话总结它们之间的关系要满足的规则：**分区表的每个唯一键，必须包含分区表达式中用到的所有列**。
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2 changes: 1 addition & 1 deletion sql-statements/sql-statement-create-table.md
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Expand Up @@ -232,7 +232,7 @@ mysql> DESC t1;
* 为了与 MySQL 兼容，TiDB 会解析但忽略 `index_col_name` 属性的 `[ASC | DESC]` 索引排序选项。
* `COMMENT` 属性不支持 `WITH PARSER` 选项。
* TiDB 在单个表中默认支持 1017 列，最大可支持 4096 列。InnoDB 中相应的数量限制为 1017 列，MySQL 中的硬限制为 4096 列。详情参阅 [TiDB 使用限制](/tidb-limitations.md)。
* 当前仅支持 Range、Hash 和 Range Columns（单列）类型的分区表，详情参阅[分区表](/partitioned-table.md)。
* 分区表支持 `HASH`、`RANGE`、`LIST` 和 `KEY` [分区类型](/partitioned-table.md#分区类型)。对于不支持的分区类型，TiDB 会报 `Warning: Unsupported partition type %s, treat as normal table` 错误，其中 `%s` 为不支持的具体分区类型。

## 另请参阅

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