mysql禁用autocommit,以及遇到的问题(转)
2016-06-18 17:38
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MySQL的autocommit(自动提交)默认是开启,其对mysql的性能有一定影响,举个例子来说,如果你插入了1000条数据,mysql会commit1000次的,如果我们把autocommit关闭掉,通过程序来控制,只要一次commit就可以了。
1,我们可以通过set来设置autocommit
查看复制打印?
mysql> set global init_connect="set autocommit=0"; //提示你用权限更高的财户来设置
ERROR 1227 (42000): Access denied; you need (at least one of) the SUPER privilege(s) for this operation
mysql> set autocommit=0;
Query OK, 0 rows affected (0.00 sec)
mysql> select @@autocommit; //查看一下autocommit的设置
+--------------+
| @@autocommit |
+--------------+
| 0 |
+--------------+
1 row in set (0.00 sec)
2,我们可以修改mysql的配置文件my.cnf来关闭autocommit
查看复制打印?
[mysqld]
init_connect='SET autocommit=0' //在mysqld里面加上这些内容
用第二种方法关,有一点要注意,连接mysql用户的权限不能大于启动mysql的用户的权限,不然init_connect='SET autocommit=0'根本不会启作用,也不会报任何错误,汗一个先。看以下实例
查看复制打印?
zhangy@ubuntu:~$ mysql -umysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.5.2-m2-log Source distribution
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> select @@autocommit; //mysql是启动用户,关闭autocommit成功
+--------------+
| @@autocommit |
+--------------+
| 0 |
+--------------+
1 row in set (0.00 sec)
mysql> Ctrl-C -- exit!
Aborted
zhangy@ubuntu:~$ mysql -uroot
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.5.2-m2-log Source distribution
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> select @@autocommit; //用root财户启动,不成功。
+--------------+
| @@autocommit |
+--------------+
| 1 |
+--------------+
1 row in set (0.00 sec)
这个会不会是mysql的bug呢?我在网上找了找这方面的问题,还真有。部分内容如下:
If a user has SUPER privilege, init_connect will not execute
(otherwise if init_connect will a wrong query no one can connect to server).
Note, if init_connect is a wrong query, the connection is closing without any errors
and next command will clause 'lost connection' error.
里面有一点说的很清楚If a user has SUPER privilege, init_connect will not execute,如果用户有更高级的权限,init_connect根本不会执行。
http://blog.csdn.net/ying_593254979/article/details/12095169
1,我们可以通过set来设置autocommit
查看复制打印?
mysql> set global init_connect="set autocommit=0"; //提示你用权限更高的财户来设置
ERROR 1227 (42000): Access denied; you need (at least one of) the SUPER privilege(s) for this operation
mysql> set autocommit=0;
Query OK, 0 rows affected (0.00 sec)
mysql> select @@autocommit; //查看一下autocommit的设置
+--------------+
| @@autocommit |
+--------------+
| 0 |
+--------------+
1 row in set (0.00 sec)
2,我们可以修改mysql的配置文件my.cnf来关闭autocommit
查看复制打印?
[mysqld]
init_connect='SET autocommit=0' //在mysqld里面加上这些内容
用第二种方法关,有一点要注意,连接mysql用户的权限不能大于启动mysql的用户的权限,不然init_connect='SET autocommit=0'根本不会启作用,也不会报任何错误,汗一个先。看以下实例
查看复制打印?
zhangy@ubuntu:~$ mysql -umysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.5.2-m2-log Source distribution
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> select @@autocommit; //mysql是启动用户,关闭autocommit成功
+--------------+
| @@autocommit |
+--------------+
| 0 |
+--------------+
1 row in set (0.00 sec)
mysql> Ctrl-C -- exit!
Aborted
zhangy@ubuntu:~$ mysql -uroot
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.5.2-m2-log Source distribution
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> select @@autocommit; //用root财户启动,不成功。
+--------------+
| @@autocommit |
+--------------+
| 1 |
+--------------+
1 row in set (0.00 sec)
这个会不会是mysql的bug呢?我在网上找了找这方面的问题,还真有。部分内容如下:
If a user has SUPER privilege, init_connect will not execute
(otherwise if init_connect will a wrong query no one can connect to server).
Note, if init_connect is a wrong query, the connection is closing without any errors
and next command will clause 'lost connection' error.
里面有一点说的很清楚If a user has SUPER privilege, init_connect will not execute,如果用户有更高级的权限,init_connect根本不会执行。
http://blog.csdn.net/ying_593254979/article/details/12095169
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