MySQL/定期清空日志 二进制日志清除 ? ''' 主同步服务器产生的二进制日志会占据大量的磁盘空间,应定期删除过期的bin-log。 ''' ? 通过PURGE MASTER LOGS删除 ? 如果您有一个在用的从属服务器,该服务器当前正在读取您正在试图删除的日志之一,则本语句不会起
MySQL/定期清空日志二进制日志清除
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''' 主同步服务器产生的二进制日志会占据大量的磁盘空间,应定期删除过期的bin-log。 '''
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通过PURGE MASTER LOGS删除
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如果您有一个在用的从属服务器,该服务器当前正在读取您正在试图删除的日志之一,则本语句不会起作用,而是会失败,并伴随一个错误。不过,如果从属服务器是停止的,并且您碰巧清理了其想要读取的日志之一,则从属服务器启动后不能复制。当从属服务器正在复制时,本语句可以安全运行。您不需要停止它们。
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要清理日志,需按照以下步骤:
写道 1、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。2、使用SHOW MASTER LOGS获得主服务器上的一系列日志。
3、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,这是清单上的最后一个日志。
4、制作您将要删除的所有日志的备份。(建议备份)
5、清理所有的日志,但是不包括目标日志。
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PURGE 语法
写道 PURGE {MASTER | BINARY} LOGS TO ‘log_name’PURGE {MASTER | BINARY} LOGS BEFORE ‘date’
用于删除列于在指定的日志或日期之前的日志索引中的所有二进制日志。这些日志也会从记录在日志索引文件中的清单中被删除,这样被给定的日志成为第一个。
BEFORE变量的date自变量可以为’YYYY-MM-DD hh:mm:ss’格式。MASTER和BINARY是同义词。
例如:
#删除binlog.000002之前的而不包含binlog.000002
mysql> PURGE MASTER LOGS TO 'binlog.000002';
#删除2011-05-28 1:35:00之前的
mysql> PURGE MASTER LOGS BEFORE '2011-05-28 1:35:00';
#清除3天前的binlog
mysql> PURGE MASTER LOGS BEFORE DATE_SUB(NOW( ), INTERVAL 3 DAY);
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设置expire-logs-days参数
缺省expire-logs-days为30天。这里设为7天,可根据自己情况调整。
写道 [mysqld]expire-logs-days = 7
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参考: http://www.mike.org.cn/articles/mysql-master-slave-sync-conf-detail/ ? ?Mysql主从同步详解
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