MySQL日志保留策略：设置binlog日志保存天数、文件大小限制

一、查看当前binlog保留时长，文件大小限制

## 查看binlog的保留时长[expire_logs_days]
## 0表示永久保留
mysql> show variables like 'expire_logs_days';
+------------------+-------+
| Variable_name    | Value |
+------------------+-------+
| expire_logs_days | 0     |
+------------------+-------+
1 row in set (0.00 sec)

## 查看binlog的文件大小限制[max_binlog_size]
## 1073741824
mysql> show variables like 'max_binlog_size';
+-----------------+------------+
| Variable_name   | Value      |
+-----------------+------------+
| max_binlog_size | 1073741824 |
+-----------------+------------+
1 row in set (0.01 sec)

二、修改保留时长

临时生效：

这种方法调整后，立即生效，但是数据库重启后，会失效

## 设置日志保留时长为30天
mysql> set global expire_logs_days=30;
Query OK, 0 rows affected (0.00 sec)

mysql> flush logs;
Query OK, 0 rows affected (0.01 sec)

mysql>  show variables like 'expire_logs_days';
+------------------+-------+
| Variable_name    | Value |
+------------------+-------+
| expire_logs_days | 30    |
+------------------+-------+
1 row in set (0.00 sec)

mysql>

永久生效：

修改my.cnf文件，永久生效，数据库启动的适合会自动加载该文件

## 打开my.cnf配置文件
[root@zxy_slave1 mysql]# vim /etc/my.cnf
## [mysqld]模块下添加：expire_logs_days
[mysqld]
expire_logs_days = 30

三、设置文件大小限制

临时生效：

这种方法调整后，立即生效，但是数据库重启后，会失效

## 将max_binlog_size设置为500M
mysql> set global max_binlog_size = 524288000;
Query OK, 0 rows affected (0.00 sec)

mysql> show variables like 'max_binlog_size';
+-----------------+-----------+
| Variable_name   | Value     |
+-----------------+-----------+
| max_binlog_size | 524288000 |
+-----------------+-----------+
1 row in set (0.00 sec)

mysql> flush logs;
Query OK, 0 rows affected (0.02 sec)

永久生效

修改my.cnf文件，永久生效，数据库启动的适合会自动加载该文件

## 打开my.cnf配置文件
[root@zxy_slave1 mysql]# vim /etc/my.cnf
## [mysqld]模块下添加：max_binlog_size
[mysqld]
expire_logs_days = 30
max_binlog_size = 500M

四、手动清理binlog

按照binlog名称删除

## 将mysql-bin.000010之前的日志清理掉
mysql> purge binary logs to 'mysql-bin.000010';
Query OK, 0 rows affected (0.01 sec)

## 清理前
[root@zxy_slave1 mysql]# ls
mysql-bin.000007  mysql-bin.000012  mysql-bin.000017   mysql-bin.000008  mysql-bin.000013  mysql-bin.index mysql-bin.000009  mysql-bin.000014  mysql-bin.000005  mysql-bin.000010  mysql-bin.000015   mysql-bin.000006  mysql-bin.000011  mysql-bin.000016
## 清理后
[root@zxy_slave1 mysql]# ls
mysql-bin.000012  mysql-bin.000017    mysql-bin.000013  mysql-bin.index     mysql-bin.000014  mysql-bin.000010  mysql-bin.000015   mysql-bin.000011  mysql-bin.000016  
[root@zxy_slave1 mysql]#

按照时间删除

## 删除2022-04-21 18:08:00之前的binlog日志
mysql> purge binary logs before '2022-04-21 18:08:00';
Query OK, 0 rows affected, 1 warning (0.02 sec)

## 删除前
[root@zxy_slave1 mysql]# vim mysql-bin.
mysql-bin.000010  mysql-bin.000012  mysql-bin.000014  mysql-bin.000016  mysql-bin.index
mysql-bin.000011  mysql-bin.000013  mysql-bin.000015  mysql-bin.000017
[root@zxy_slave1 mysql]# ls

## 删除后
[root@zxy_slave1 mysql]# ls
mysql-bin.000017  mysql-bin.index