Home Database Mysql Tutorial mysql-bin.000001文件是怎么产生的及处理方法

mysql-bin.000001文件是怎么产生的及处理方法

Jun 07, 2016 pm 05:20 PM
mysql

mysql-bin.000001文件是怎么产生的及处理方法mysql-bin.000001、mysql-bin.000002等文件是数据库的操作日志,例如UPDATE一个表,

mysql-bin.000001文件是怎么产生的及处理方法
mysql-bin.000001、mysql-bin.000002等文件是数据库的操作日志,例如UPDATE一个表,或者DELETE一些数据,即使该语句没有匹配的数据,这个命令也会存储到日志文件中,还包括每个语句执行的时间,也会记录进去的。

这样做主要有以下两个目的:
1:数据恢复
如果你的数据库出问题了,而你之前有过备份,那么可以看日志文件,找出是哪个命令导致你的数据库出问题了,想办法挽回损失。

2:主从服务器之间同步数据
主服务器上所有的操作都在记录日志中,从服务器可以根据该日志来进行,以确保两个同步。

处理方法分两种情况:
1:只有一个mysql服务器,那么可以简单的注释掉这个选项就行了。
vi /etc/my.cnf把里面的 log-bin 这一行注释掉,重启mysql服务即可。

# Replication Master Server (default)

# binary logging is required for replication

log-bin=mysql-bin

2:如果你的环境是主从服务器,,那么就需要做以下操作了。
A:在每个从属服务器上,使用SHOW SLAVE STATUS来检查它正在读取哪个日志。
B:使用SHOW MASTER LOGS获得主服务器上的一系列日志。
C:在所有的从属服务器中判定最早的日志,这个是目标日志,如果所有的从属服务器是更新的,就是清单上的最后一个日志。
D:清理所有的日志,但是不包括目标日志,因为从服务器还要跟它同步。

清理日志方法为:

PURGE MASTER LOGS TO 'mysql-bin.010';

PURGE MASTER LOGS BEFORE '2008-12-19 21:00:00';

如果你确定从服务器已经同步过了,跟主服务器一样了,那么可以直接 RESET MASTER 将这些文件删除。

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