MySQL 历史 binlog 日志处理

一、问题的引出

MySQL binlog 如果不清理会占用服务器的空间,那么怎么处理binlog日志呢

二、解决办法

1、物理删除

df -Th 查看磁盘空间

➜ bob@bob-pc ~ df -Th

文件系统 类型 容量 已用 可用 已用% 挂载点

udev devtmpfs 7.8G 0 7.8G 0% /dev

tmpfs tmpfs 1.6G 2.4M 1.6G 1% /run

/dev/sda1 ext4 110G 101G 3.6G 97% /

tmpfs tmpfs 7.8G 399M 7.4G 6% /dev/shm

tmpfs tmpfs 5.0M 4.0K 5.0M 1% /run/lock

tmpfs tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup

/dev/sdb1 ext4 458G 35G 400G 8% /data/mnt

tmpfs tmpfs 1.6G 68K 1.6G 1% /run/user/1000

cat bin.index 文件看数据库binlog文件

➜ bob@bob-pc /data/mnt/mysql_data sudo cat bin.index

./bin.000112

./bin.000113

./bin.000114

./bin.000115

./bin.000116

rm -rf bin.000112 bin.000113 删除开始的数据

rm -rf bin.000112 bin.000113

vim bin.index 编辑bin.index 文件 ,删除掉刚刚删掉的binlog，不然下次mysql 重启会起不来

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2、逻辑删除

(root@localhost:mysql3306.sock)[(none)]> show binary logs;

+------------+-----------+

| Log_name | File_size |

+------------+-----------+

| bin.000112 | 0 |

| bin.000113 | 0 |

| bin.000114 | 217 |

| bin.000115 | 194 |

| bin.000116 | 194 |

+------------+-----------+

5 rows in set (0.00 sec)

(root@localhost:mysql3306.sock)[(none)]> show variables like '%expire_logs_days%';

+------------------+-------+

| Variable_name | Value |

+------------------+-------+

| expire_logs_days | 7 |

+------------------+-------+

1 row in set (0.00 sec)

(root@localhost:mysql3306.sock)[(none)]> set global expire_logs_days = 4;

Query OK, 0 rows affected (0.00 sec)

这里修改/etc/my.cnf 重启mysql

3、手动清除binlog文件

登录机器 执行 删除3天前的MySQL binlog日志

(root@localhost:mysql3306.sock)[(none)]> PURGE MASTER LOGS BEFORE DATE_SUB(CURRENT_DATE, INTERVAL 3 DAY);

Query OK, 0 rows affected (0.01 sec)

(root@localhost:mysql3306.sock)[(none)]> show master logs ;

+------------+-----------+

| Log_name | File_size |

+------------+-----------+

| bin.000112 | 0 |

| bin.000113 | 0 |

| bin.000114 | 217 |

| bin.000115 | 194 |

| bin.000116 | 194 |

+------------+-----------+

删除mysql-bin.000114 之前的binlog 这里是个开区间(-无穷,bin.000114)

(root@localhost:mysql3306.sock)[(none)]> PURGE MASTER LOGS to 'bin.000114';

Query OK, 0 rows affected, 2 warnings (0.11 sec)

清除了运行,一下命令显示已经删除了

(root@localhost:mysql3306.sock)[(none)]> show master logs;

+------------+-----------+

| Log_name | File_size |

+------------+-----------+

| bin.000114 | 217 |

| bin.000115 | 194 |

| bin.000116 | 194 |

+------------+-----------+

3 rows in set (0.00 sec)