IO_CACHE 还有个pos_in_file属性,这是个整数值,我们也可以把它看成指针,指向内存 buffer 写满之后,里面的内容转移到磁盘临时文件中的哪个位置。 savepoint 中保存着它创建的那一时刻的binlog offset,binlog offset 减去 pos_in_file 就是write_pos要往回移动到的位置。 情况2:丢弃内存 buffer
In this article, we learned about the COMMIT, ROLLBACK, and SAVEPOINT statements in MySQL. These are transactional statements supported by the InnoDB engine, and we can use them to manage our transactions. As always, the SQL queries used in this article are availableover on GitHub....
The real HLS is the same HLS as for WL#1193 Rollback Savepoint implemented in NDB Cluster and in its table handler The interest of this is also to handle rollback of SQL statements to make the integration into MySQL smoother. The path ahead is to make use of the execute flag and savep...
1 row in set (0.00sec)//尝试回滚到第二个保存点, 出错mysql>rollback to a2;1305 -SAVEPOINT a2 does not exist mysql>
其他非相关信息我都隐藏掉了[(yejr@imysql.com)]> show slave status \G;Slave_IO_Running: YesSlave_SQL_Running: NoLast_Errno: 1064Last_Error: Error 'You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to ...
2 rows in set (0.00sec) mysql> update planet_user_blacklist set updated_at = 100 where id = 1; Query OK, 1 row affected (0.01sec) Rows matched: 1 Changed: 1 Warnings: 0mysql>savepoint test1; Query OK, 0 rows affected (0.00sec) ...
(For a new inserted row, the lock information is carried by the transaction ID stored in the row; the lock is not separately stored in memory. In this case, the row lock is released in the undo.) Savepoints that were set at a later time than the named savepoint are deleted. ...
The `RELEASE SAVEPOINT` statement in MySQL is used to remove a previously defined savepoint from the current transaction. It frees up resources by indicating that the savepoint is no longer needed. Usage `RELEASE SAVEPOINT` is used within a transaction to delete a savepoint that was set using ...
+---+ | a | +---+ | 1 | +---+ 1 row in set MySQL 兼容性 使用ROLLBACK TO SAVEPOINT 语句将事物回滚到指定保存点时,MySQL 会释放该保存点之后才持有的锁,但在 TiDB 悲观事务中,不会立即释放该保存点之后才持有的锁,而是等到事务提交或者回滚时,才释放全部持有的锁。
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