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如何利用MySQL的binlog恢复误删数据库详解

目录

  • 1 查看当前数据库内容并备份数据库
  • 2 开启bin_log功能
  • 3 模拟误操作（插入3条数据，删除数据库）
  • 4 数据恢复
  • 5 总结

1 查看当前数据库内容并备份数据库
查看数据库信息：
如何利用MySQL的binlog恢复误删数据库详解
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备份数据库：
[root@localhost ~]# mysqldump -u root -p t > /mnt/t.sqlEnter password: [root@localhost ~]# ll /mnt/t.sql -rw-r--r-- 1 root root 1771 Aug 25 11:56 /mnt/t.sql


2 开启bin_log功能
首先查看数据库是否开启bin_log功能
mysql> show variables like "%log_bin%";

如何利用MySQL的binlog恢复误删数据库详解
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需要修改mysql的配置文件，/etc/的my.cnf，添加一句log_bin = mysql_bin即可
如何利用MySQL的binlog恢复误删数据库详解
文章图片

如何利用MySQL的binlog恢复误删数据库详解
文章图片


3 模拟误操作（插入3条数据，删除数据库）
mysql> insert into t1 values (3); Query OK, 1 row affected (0.00 sec)mysql> insert into t1 values (4); Query OK, 1 row affected (0.00 sec)mysql> insert into t1 values (5); Query OK, 1 row affected (0.00 sec)mysql> select * from t1; +------+| id|+------+|1 ||2 ||5 ||4 ||3 |+------+5 rows in set (0.00 sec)mysql> flush logs; Query OK, 0 rows affected (0.00 sec)mysql> show master status; +------------------+----------+--------------+------------------+| File| Position | Binlog_Do_DB | Binlog_Ignore_DB |+------------------+----------+--------------+------------------+| mysql_bin.000003 |106 |||+------------------+----------+--------------+------------------+1 row in set (0.00 sec)

删除数据：
mysql> truncate t1; Query OK, 0 rows affected (0.00 sec)mysql> select * from t1; Empty set (0.00 sec)

此时突然数据库损坏或者人为删除
mysql> drop table t1; Query OK, 0 rows affected (0.00 sec)mysql> show tables; Empty set (0.00 sec)


4 数据恢复
1 用已经备份的/mnt/t.sql来恢复数据
mysql> source /mnt/t.sql; Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.01 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 2 rows affected (0.00 sec)Records: 2Duplicates: 0Warnings: 0Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)mysql> show tables; +-------------+| Tables_in_t |+-------------+| t1|+-------------+1 row in set (0.00 sec)mysql> select * from t1; +------+| id|+------+|1 ||2 |+------+2 rows in set (0.00 sec)

2 还有三条数据没有恢复，怎么办。只能用bin-log来恢复
[root@localhost ~]# mysqlbinlog --no-defaults /var/lib/mysql/mysql_bin.000002 | mysql -u root -p123.com t

mysql> use t; Reading table information for completion of table and column namesYou can turn off this feature to get a quicker startup with -ADatabase changedmysql> select * from t1; +------+| id|+------+|1 ||2 ||3 ||4 ||5 |+------+5 rows in set (0.00 sec)mysql>


5 总结
备份数据
mysqldump -uroot -p123456 test -l -F '/tmp/test.sql'-l:读锁（只能读取，不能更新）-F:即flush logs，可以重新生成新的日志文件，当然包括log-bin日志

查看binlog日志
mysql>show master status;

导入之前备份数据
mysql -uroot -p t -v -f
恢复binlog-file二进制日志文件
mysqlbinlog --no-defaults binlog-file | mysql -uroot -p t

从某一(367)点开始恢复
mysqlbinlog --no-defaults --stop-position="367" mysql-bin.000001| mysql -uroot -p t

先查好那一点，用more来查看
[root@localhost mysql]# /usr/bin/mysqlbinlog --no-defaults mysql-bin.000002 --start-position="794" --stop-position="1055" | more

【如何利用MySQL的binlog恢复误删数据库详解】然后恢复
[root@localhost mysql]# /usr/bin/mysqlbinlog --no-defaults mysql-bin.000002 --start-position="794" --stop-position="1055" | /usr/bin/mysql -uroot -p t

重置binlog日志
mysql> reset master; Query OK, 0 rows affected (0.01 sec)mysql> show master status; +------------------+----------+--------------+------------------+| File| Position | Binlog_Do_DB | Binlog_Ignore_DB |+------------------+----------+--------------+------------------+| mysql-bin.000001 |106 |||+------------------+----------+--------------+------------------+

mysql> flush logs; #关闭当前的二进制日志文件并创建一个新文件，新的二进制日志文件的名字在当前的二进制文件的编号上加1。

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