查看/设置MySQL数据库的事务隔离级别

查看InnoDB存储引擎 系统级的隔离级别 和 会话级的隔离级别：

mysql> select @@global.tx_isolation,@@tx_isolation;
+-----------------------+-----------------+
| @@global.tx_isolation | @@tx_isolation  |
+-----------------------+-----------------+
| REPEATABLE-READ       | REPEATABLE-READ |
+-----------------------+-----------------+
1 row in set (0.00 sec)

修改隔离级别

SET [SESSION | GLOBAL] TRANSACTION ISOLATION LEVEL {READ UNCOMMITTED | READ COMMITTED | REPEATABLE READ | SERIALIZABLE}

例如：

mysql> set global transaction isolation level read committed; //全局的

mysql> set session transaction isolation level read committed; //当前会话