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.
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 中的全部 binlog...
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...
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 us...
1 row in set (0.01sec)//插入第二条数据mysql> insert into t_x value(2, '2'); Query OK,1 row affected (0.01sec)//设置保存点2mysql>savepoint a2; Query OK,0 rows affected (0.01sec)//查询两条数据mysql> select *from t_x;+---+---+ | id ...
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) ...
results in a transaction savepoint with the specified name, which is returned by the operation as a string. The session.setSavepoint('name') operation can be called multiple times in this way, and if the name has already been used for a savepoint then the previous savepoint is is deleted ...
MySQL RELEASE SAVEPOINT-Anweisung Die Anweisung `RELEASE SAVEPOINT` in MySQL wird verwendet, um einen zuvor definierten Savepoint aus der aktuellen Transaktion zu entfernen. Er gibt Ressourcen frei, indem er anzeigt, dass der Speicherpunkt nicht mehr benötigt wird. Verwendung RELEASE SAVEPOINT" ...
In mysql on deadlock occurance all savepoints will be deleted. so trying to rollback to previous savepoint will cause error: SAVEPOINT ... does not exist; here is example: 1 Query create table user2(id int primary key) engine=innodb; 1 Query set autocommit=0;INSERT INTO `user2` (`...
+---+ | 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。