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pessimistic-transaction: clarify Point Get lock behavior for non-existing keys under different isolation levels #21740

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Jun 24, 2026
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pessimistic-transaction: clarify Point Get lock behavior for non-existing keys under different isolation levels #21740

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Expand Up @@ -75,7 +75,11 @@ BEGIN /*T! PESSIMISTIC */;

- 如果 `Point Get` 和 `Batch Point Get` 算子没有读到数据，依然会对给定的主键或者唯一键加锁，阻塞其他事务对相同主键唯一键加锁或者进行写入操作。

- 支持 `FOR UPDATE OF TABLES` 语法，对于存在多表 join 的语句，只对 `OF TABLES` 中包含的表关联的行进行悲观锁加锁操作。
> **注意：**
>
> 此行为仅适用于[可重复读 (Repeatable Read)](/transaction-isolation-levels.md#可重复读隔离级别-repeatable-read) 隔离级别。在[读已提交 (Read Committed)](/transaction-isolation-levels.md#读已提交隔离级别-read-committed) 隔离级别下，`Point Get` 和 `Batch Point Get` 算子不会对不存在的键加锁。

- 支持 `FOR UPDATE OF TABLES` 语法，对于存在多表 join 的语句，只对 `OF TABLES` 中包含的表关联的行进行悲观锁加锁操作。

## 和 MySQL InnoDB 的差异

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