mysql误删数据后快速回滚

binlog2sql快速回滚

首先，确认你的MySQL server开启了binlog，设置了以下参数:

[mysqld]
server-id = 1
log_bin = /var/log/mysql/mysql-bin.log
max_binlog_size = 1000M
binlog-format = row

如果没有开启binlog，也没有预先生成回滚SQL，那真的无法快速回滚了。对存放重要业务数据的MySQL，强烈建议开启binlog。

随后，安装开源工具binlog2sql。binlog2sql是一款简单易用的binlog解析工具，其中一个功能就是生成回滚SQL。

git clone https://github.com/danfengcao/binlog2sql.git
pip install -r requirements.txt

然后，我们就可以生成回滚SQL了。

背景：误删了test库f表整张表的数据，需要紧急回滚。

原有数据
mysql> select * from f;
+-----+-----+---------------------+
| uid | did | updateTime          |
+-----+-----+---------------------+
|   1 |  18 | 2016-12-06 12:28:18 |
|   2 |  19 | 2016-12-06 12:55:56 |
|   3 |  20 | 2016-12-07 14:00:58 |
|   4 |  21 | 2016-12-07 14:01:00 |
+-----+-----+---------------------+

误操作
mysql> delete from f;
Query OK, 4 rows affected (0.00 sec)

f表被清空
mysql> select * from f;
Empty set (0.00 sec)

回滚步骤：

1. 登录mysql，查看目前的binlog文件

   mysql> show master logs;
   +------------------+-----------+
   | Log_name         | File_size |
   +------------------+-----------+
   | mysql-bin.000001 |  12262268 |
   | mysql-bin.000002 |    132776 |
   +------------------+-----------+

2. 最新的binlog文件是mysql-bin.000002，我们再定位误操作SQL的binlog位置

   扫描二维码关注公众号，回复： 3616050 查看本文章

   $ python binlog2sql/binlog2sql.py -h127.0.0.1 -P3306 -uadmin -p'admin' -dtest -t f --start-file='mysql-bin.000002'
   
   输出：
   DELETE FROM `test`.`f` WHERE `did`=18 AND `updateTime`='2016-12-06 12:28:18' AND `uid`=1 LIMIT 1; #start 4 end 314
   DELETE FROM `test`.`f` WHERE `did`=19 AND `updateTime`='2016-12-06 12:55:56' AND `uid`=2 LIMIT 1; #start 4 end 314
   DELETE FROM `test`.`f` WHERE `did`=20 AND `updateTime`='2016-12-07 14:00:58' AND `uid`=3 LIMIT 1; #start 4 end 314
   DELETE FROM `test`.`f` WHERE `did`=21 AND `updateTime`='2016-12-07 14:01:00' AND `uid`=4 LIMIT 1; #start 4 end 314

3. 生成回滚sql，并检查回滚sql是否正确

   $ python binlog2sql/binlog2sql.py -h127.0.0.1 -P3306 -uadmin -p'admin' -dtest -t f --start-file='mysql-bin.000002' --start-pos=4 --end-pos=314 -B
   
   输出：
   INSERT INTO `test`.`f`(`did`, `updateTime`, `uid`) VALUES (21, '2016-12-07 14:01:00', 4); #start 4 end 314
   INSERT INTO `test`.`f`(`did`, `updateTime`, `uid`) VALUES (20, '2016-12-07 14:00:58', 3); #start 4 end 314
   INSERT INTO `test`.`f`(`did`, `updateTime`, `uid`) VALUES (19, '2016-12-06 12:55:56', 2); #start 4 end 314
   INSERT INTO `test`.`f`(`did`, `updateTime`, `uid`) VALUES (18, '2016-12-06 12:28:18', 1); #start 4 end 314

4. 确认回滚sql正确，执行回滚语句。登录mysql，数据回滚成功。

   $ python binlog2sql.py -h127.0.0.1 -P3306 -uadmin -p'admin' -dtest -t f --start-file='mysql-bin.000002' --start-pos=4 --end-pos=314 -B | mysql -h127.0.0.1 -P3306 -uadmin -p'admin'
   
   mysql> select * from f;
   +-----+-----+---------------------+
   | uid | did | updateTime          |
   +-----+-----+---------------------+
   |   1 |  18 | 2016-12-06 12:28:18 |
   |   2 |  19 | 2016-12-06 12:55:56 |
   |   3 |  20 | 2016-12-07 14:00:58 |
   |   4 |  21 | 2016-12-07 14:01:00 |
   +-----+-----+---------------------+