MySQL怎么禁用autocommit

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 deniedyou 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

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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。

MySQLautocommit（自提交）默认启其mysql性能定影响举例说插入1000条数据mysqlcommit1000我autocommit关闭掉通程序控制要commit

1,我通set设置autocommit

查看复制打印?

mysql>set global init_connect="set autocommit=0"//提示用权限更高财户设置

ERROR 1227 (42000): Access deniedyou 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autocommit设置

+--------------+

| @@autocommit |

+--------------+

| 0 |

+--------------+

1 row in set (0.00 sec)

2,我修改mysql配置文件my.cnf关闭autocommit

查看复制打印?

[mysqld]

init_connect='SET autocommit=0' //mysqld面加些内容

用第二种关点要注意连接mysql用户权限能于启mysql用户权限init_connect='SET autocommit=0'根本启作用报任何错误汗先看实例

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启用户关闭autocommit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财户启功

+--------------+

| @@autocommit |

+--------------+

| 1 |

+--------------+

1 row in set (0.00 sec)

mysqlbug呢我网找找面问题真部内容：

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.

面点说清楚If a user has SUPER privilege, init_connect will not execute用户更高级权限init_connect根本执行

Internal HDD 内置硬盘驱动器

更改mysql中auto的方法：

利用这个变量，可以通过如下方式禁用 autocommit：

方法一：

mysql>SET GLOBAL init_connect='SET autocommit=0'

方法二：

在 MySQL 的配置文件中设置

init_connect='SET autocommit=0'

方法三：

启动 mysql 时带上命令行参数 –init_connect='SET autocommit=0'

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