如何利用MySQL的binlog恢复误删数据库详解

1 查看当前数据库内容并备份数据库

查看数据库信息：

备份数据库：

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[root@localhost ~]# mysqldump -u root -p t > /mnt/t.sql enter 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

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1	mysql> show variables like "%log_bin%" ;

需要修改mysql的配置文件，/etc/的my.cnf，添加一句log_bin = mysql_bin即可

3 模拟误操作（插入3条数据，删除数据库）

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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：

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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

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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

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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: 2  duplicates: 0  warnings: 0   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) 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

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1	[root@localhost ~]# mysqlbinlog --no-defaults /var/lib/mysql/mysql_bin.000002 | mysql -u root -p123.com t

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

5 总结

备份数据

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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

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1	mysql>show master status;

导入之前备份数据

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mysql -uroot -p t -v -f </mnt/t.sql -v查看导入的详细信息 -f是当中间遇到错误时，可以skip过去，继续执行下面的语句

恢复binlog-file二进制日志文件

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1	mysqlbinlog --no-defaults binlog-file | mysql -uroot -p t

从某一(367)点开始恢复

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1	mysqlbinlog --no-defaults --stop-position="367" mysql-bin.000001| mysql -uroot -p t

先查好那一点，用more来查看

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1	[root@localhost mysql]# /usr/bin/mysqlbinlog --no-defaults mysql-bin.000002 --start-position="794" --stop-position="1055" | more

然后恢复

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1	[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

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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 |              |                  | + ------------------+----------+--------------+------------------+

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1	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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原文链接：https://juejin.cn/post/7012122461110009863