测试环境
Mac OS 10.11.6
mysql 5.7.21
python 3.6.5
开启binlog
1、检查是否开启binlog
mysql>show variables like '%log_bin%';
2、开启binlog
mysql的配置文件路径查找优先级为
/etc/my.cnf
/etc/mysql/my.cnf
/usr/local/etc/my.cnf
通过Homebrew安装的my.cnf放在/usr/local/etc/中
$ vim my.cnf
[mysqld] server_id = 1 log_bin = /var/log/mysql/mysql-bin.log max_binlog_size = 1G binlog_format = row binlog_row_image = full
3、重启服务
$ mysql.server restart
4、再次检查是否开启binlog
5、查看日志文件:
$ cd /usr/local/var/mysql $ ls
数据恢复
0、几个术语
数据查询语言DQL
数据操纵语言DML
数据定义语言DDL
数据控制语言DCL
1、MySQL闪回原理
delete操作,delete -> insert
insert操作,insert -> delete
update操作,交换SET和WHERE
恢复实战
1、确认binlog已开启
2、数据准备
(1) 建表
mysql> use demo mysql> CREATE TABLE `user` ( `id` int(11) NOT NULL PRIMARY KEY AUTO_INCREMENT, `name` varchar(20) DEFAULT '', `age` tinyint(3) DEFAULT '0', `create_time` datetime DEFAULT CURRENT_TIMESTAMP ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='用户表测试';
(2) 插入数据
mysql> INSERT INTO `user` (`name`, `age`) VALUES ('小王', 21), ('小张', 22), ('小红', 22), ('小楠', 23), ('小柱', 25);
(3) 查看数据
mysql> select * from user; +----+--------+------+---------------------+ | id | name | age | create_time | +----+--------+------+---------------------+ | 1 | 小王 | 21 | 2019-01-21 18:18:41 | | 2 | 小张 | 22 | 2019-01-21 18:18:41 | | 3 | 小红 | 22 | 2019-01-21 18:18:41 | | 4 | 小楠 | 23 | 2019-01-21 18:18:41 | | 5 | 小柱 | 25 | 2019-01-21 18:18:41 | +----+--------+------+---------------------+
(4) 删除数据
mysql> delete from user;
(5)确认数据被删除
mysql> select * from user; Empty set (0.00 sec)
3、数据恢复
(1)下载所需工具
> git clone https://github.com/danfengcao/binlog2sql.git > cd binlog2sql > pip install -r requirements.txt
(2)查看目前的binlog
mysql> show master logs; +------------------+-----------+ | Log_name | File_size | +------------------+-----------+ | mysql-bin.000001 | 467 | | mysql-bin.000002 | 732 | | mysql-bin.000003 | 4574 | +------------------+-----------+
最新的biglog是 mysql-bin.000003
(3)查找删除语句
$ python binlog2sql/binlog2sql.py -h127.0.0.1 -P3306 -uroot -p'123456' -ddemo -tuser --start-file='mysql-bin.000003' --start-datetime='2019-01-21 18:10:00' --stop-datetime='2019-01-21 18:25:00' > raw.sql $ more raw.sql
字段说明
-h127.0.0.1 # 数据库地址 -P3306 # 端口号 -uroot # 用户名 -p'123456' # 密码 -ddemo # 数据库名称 -tuser # 表名称 --start-file='mysql-bin.000003' # binlog日志文件 --start-datetime='2019-01-21 18:10:00' # 开始时间 --stop-datetime='2019-01-21 18:25:00' # 结束时间
找到DELETE语句中类似如下字段,回忆一下时间是否差不多
#start 4228 end 4543 time 2019-01-21 18:20:15
(4)生成回滚语句
$ python binlog2sql/binlog2sql.py -h127.0.0.1 -P3306 -uroot -p'123456' -ddemo -tuser --start-file='mysql-bin.000003' --start-position=4228 --stop-position=4543 -B > rollback.sql $ more rollback.sql
(5) 执行回滚操作
其实就是重新插入数据
$ mysql -h127.0.0.1 -P3306 -uroot -p'123456' < rollback.sql
(6) 检查数据恢复情况
mysql> select * from user; +----+--------+------+---------------------+ | id | name | age | create_time | +----+--------+------+---------------------+ | 1 | 小王 | 21 | 2019-01-21 18:18:41 | | 2 | 小张 | 22 | 2019-01-21 18:18:41 | | 3 | 小红 | 22 | 2019-01-21 18:18:41 | | 4 | 小楠 | 23 | 2019-01-21 18:18:41 | | 5 | 小柱 | 25 | 2019-01-21 18:18:41 | +----+--------+------+---------------------+