利用MySQL的binlog恢复误删的数据库

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：

[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%";

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）

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)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 </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

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

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。

来源地址：https://blog.csdn.net/qq_45228323/article/details/129977643