mysql主从日志的定期清理
mysql主从的binlog定时删除是很重要的，一般是通过expire_logs_days=10来设置binlog保留的天数（mysql5.0一下版本不支持），但有时这还不够，假如有几天的日志量
mysql主从的binlog定时删除是很重要的，一般是通过expire_logs_days = 10来设置binlog保留的天数（mysql5.0一下版本不支持），但有时这还不够，服务器空间，假如有几天的日志量非常大，硬盘可能会满，美国空间，所以不但要设置保留的天数，还要监控硬盘的空间使用情况。写了一个脚本，适合各个版本的mysql，保留3天的日志，当存放日志的硬盘使用率超过80%，则保留2天，但至少会保留一天的binlog日志文件。
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