查看当前日志保存天数：
mysql> show variables like '%expire_logs_days%';
+------------------+-------+
| Variable_name | Value |
+------------------+-------+
| expire_logs_days | 0 |
+------------------+-------+
1 row in set (0.08 sec)默认是0，也就是logs不过期。
也可以使用 show variables like '%expire%' 查看是否有开启日志到期自动删除
mysql> show variables like '%expire%';
+--------------------------------+--------+
| Variable_name | Value |
+--------------------------------+--------+
| binlog_expire_logs_auto_purge | ON |
| binlog_expire_logs_seconds | 432000 |
| disconnect_on_expired_password | ON |
| expire_logs_days | 0 |
+--------------------------------+--------+
4 rows in set (0.00 sec)
设置BINLOG到期时间
临时生效,无需重起mysql
如果数据库此时不便重启，可以设置全局的参数，使他临时生效：
mysql> set global expire_logs_days=5;
设置了只保留5天BINLOG, 下次重启mysql这个参数默认会失败。
如果上面指令报错，则改为set global binlog_expire_logs_seconds=432000
mysql> set global expire_logs_days=7;
ERROR 3683 (HY000): The option expire_logs_days and binlog_expire_logs_seconds cannot be used together. Please use binlog_expire_logs_seconds to set the expire time (expire_logs_days is deprecated)
mysql> set global binlog_expire_logs_seconds=432000;
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> show variables like '%expire%';
+--------------------------------+--------+
| Variable_name | Value |
+--------------------------------+--------+
| binlog_expire_logs_auto_purge | ON |
| binlog_expire_logs_seconds | 432000 |
| disconnect_on_expired_password | ON |
| expire_logs_days | 0 |
+--------------------------------+--------+
4 rows in set (0.00 sec)
写入配置文件,mysql重启依旧生效
如果要永久生效，需要在my.cnf中设置
vi /etc/my.cnf
追加内容：
binlog_expire_logs_seconds=432000
手动删除BINLOG
也可以先手动删除BINLOG (purge binary logs)
删除指定的日志
mysql> PURGE {MASTER | BINARY} LOGS TO 'log_name'
例：删除binlog.1000
mysql> PURGE MASTER LOGS TO 'binlog.1000';
或删除指定日期之前的日志索引中的所有二进制日志。
mysql> PURGE {MASTER | BINARY} LOGS BEFORE 'date'
例：删除2023-06-03 12:00:00前的文件
mysql> PURGE MASTER LOGS BEFORE '2023-06-03 12:00:00';
例：删除3天前的日志
mysql> PURGE MASTER LOGS BEFORE DATE_SUB( NOW( ), INTERVAL 3 DAY);
