在ALTER TABLE之后,MySQL shell中的回滚不起作用

Question

(MySQL 5.5,InnoDB表)为什么我不能回滚,无论是保存点还是以前的begin语句？

mysql> set autocommit=0;
Query OK, 0 rows affected (0.00 sec)

mysql> start transaction;
Query OK, 0 rows affected (0.00 sec)

mysql> savepoint id;
Query OK, 0 rows affected (0.00 sec)

mysql> alter table sg_Section add column (published tinyint(1) default 0);
Query OK, 2 rows affected (0.30 sec)
Records: 2  Duplicates: 0  Warnings: 0

mysql> rollback to savepoint id;
ERROR 1305 (42000): SAVEPOINT id does not exist

在保存点之后没有运行任何命令时,它似乎"工作":

mysql> savepoint id;
Query OK, 0 rows affected (0.00 sec)

mysql> rollback to savepoint id;
Query OK, 0 rows affected (0.00 sec)

Answer 1

DDL在MySQL中不是事务性的.

任何DDL语句都隐式提交open事务.

手册中的更多细节:http://dev.mysql.com/doc/refman/5.5/en/implicit-commit.html