Mysql学习详解MySQL误操作后怎样进行数据恢复

《Mysql学习详解MySQL误操作后怎样进行数据恢复》要点：
本文介绍了Mysql学习详解MySQL误操作后怎样进行数据恢复，希望对您有用。如果有疑问，可以联系我们。

MYSQL入门一、开启binlog.

MYSQL入门首先查看binlog是否开启

MYSQL入门
mysql> show variables like "log_bin";
+---------------+-------+
|Variable_name | Value 
+---------------+-------+
| log_bin  OFF 
+---------------+-------+
1 row in set (0.00 sec)

MYSQL入门值为OFF,需开启,开启binlog方式如下：

MYSQL入门
#vim /etc/my.cnf

MYSQL入门在[mysqld]中加入

MYSQL入门
log-bin     = mysql-bin
log-bin     = /usr/local/mysql/log/mysql-bin.log

MYSQL入门重启mysql服务

MYSQL入门
#service mysqld stop
#service mysqld start

MYSQL入门二、模拟数据写入

MYSQL入门建库

MYSQL入门
create database backup;

MYSQL入门建表

MYSQL入门
CREATE TABLE `number` (
 `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '编号',`updatetime` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

MYSQL入门写入数据

MYSQL入门程序2-1

MYSQL入门
#coding:utf8
#python2.7
import MySQLdb
import time
def connect_mysql(db_host="192.168.11.169",user="martin",passwd="martin",db="backup",charset="utf8"):
 conn = MySQLdb.connect(host=db_host,user=user,passwd=passwd,db=db,charset=charset)
 conn.autocommit(True)
return conn.cursor()
#数据插入
for i in range(0,10):
#time=time.strftime("%Y-%m-%d %H:%M:%S")
sql = 'insert into number(updatetime) values(%s)'
values = [(time.strftime("%Y-%m-%d %H:%M:%S"))]
 db1 = connect_mysql()
print db1.executemany(sql,values)

MYSQL入门查询数据

MYSQL入门
mysql> select * from number;
+-------+------------------------+
| id | updatetime   
+--------------------------------+
| 1 | 2016-06-29 23:27:15 |
| 2 | 2016-06-29 23:27:15 |
| 3 | 2016-06-29 23:27:15 |
| 4 | 2016-06-29 23:27:15 |
| 5 | 2016-06-29 23:27:15 |
| 6 | 2016-06-29 23:27:15 |
| 7 | 2016-06-29 23:27:15 |
| 8 | 2016-06-29 23:27:15 |
| 9 | 2016-06-29 23:27:15 |
| 10 | 2016-06-29 23:27:15 |
+-------+------------------------+
10 rows in set (0.00 sec)

MYSQL入门三、全量备份

MYSQL入门
mysqldump -uroot -p -F --master-data=2 backup |gzip> /martin/data/backup_$(date +%F).sql.gz

MYSQL入门注：加-F能刷新binlog,方便恢复时操作.

MYSQL入门四、模拟写入增量数据

MYSQL入门继续执行程序2-1.

MYSQL入门查询数据

MYSQL入门
mysql> select * from number;
+----+---------------------------+
| id | updatetime   |
+----+---------------------------+
| 1 | 2016-06-29 23:27:15 |
| 2 | 2016-06-29 23:27:15 |
| 3 | 2016-06-29 23:27:15 |
| 4 | 2016-06-29 23:27:15 |
| 5 | 2016-06-29 23:27:15 |
| 6 | 2016-06-29 23:27:15 |
| 7 | 2016-06-29 23:27:15 |
| 8 | 2016-06-29 23:27:15 |
| 9 | 2016-06-29 23:27:15 |
| 10 | 2016-06-29 23:27:15 |
| 11 | 2016-06-29 23:31:03 |
| 12 | 2016-06-29 23:31:03 |
| 13 | 2016-06-29 23:31:03 |
| 14 | 2016-06-29 23:31:03 |
| 15 | 2016-06-29 23:31:03 |
| 16 | 2016-06-29 23:31:03 |
| 17 | 2016-06-29 23:31:03 |
| 18 | 2016-06-29 23:31:03 |
| 19 | 2016-06-29 23:31:03 |
| 20 | 2016-06-29 23:31:03 |
+-------+---------------------+
20 rows in set (0.00 sec)

MYSQL入门五、增量备份

MYSQL入门保留mysql-bin.000002及之后的binlog即可.

MYSQL入门六、模拟误操作

MYSQL入门
delete from number;

MYSQL入门七、再次写入增量数据

MYSQL入门执行程序2-1

MYSQL入门select * from bumber;

MYSQL入门
+------+------------------------+
| id | updatetime   |
+------+------------------------+
| 21 | 2016-06-29 23:41:06 |
| 22 | 2016-06-29 23:41:06 |
| 23 | 2016-06-29 23:41:06 |
| 24 | 2016-06-29 23:41:06 |
| 25 | 2016-06-29 23:41:06 |
| 26 | 2016-06-29 23:41:06 |
| 27 | 2016-06-29 23:41:06 |
| 28 | 2016-06-29 23:41:06 |
| 29 | 2016-06-29 23:41:06 |
| 30 | 2016-06-29 23:41:06 |
+------+------------------------+
10 rows in set (0.00 sec)

MYSQL入门八、恢复

MYSQL入门此时发现之前的delete操作为误操作,急需恢复,恢复过程如下

MYSQL入门给该表加上读锁

MYSQL入门
lock table number read;

MYSQL入门将全量备份的数据导入

MYSQL入门
#cd /martin/data/
#gzip -d number_2016-06-29.sql.gz
#grep -i "change" *.sql
-- CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000002',MASTER_LOG_POS=107;

MYSQL入门刷新日志

MYSQL入门
#mysqladmin -uroot -p'martin' flush-logs
#cd /usr/local/mysql/log
#ls|grep mysql-bin|grep -v index
mysql-bin.000001
mysql-bin.000002
mysql-bin.000003

MYSQL入门可确定mysql-bin.000002为增量数据binlog

MYSQL入门导入全量备份

MYSQL入门
#cd /martin/data/
#mysql -uroot -p backup < number_2016-06-29.sql
#cp /usr/local/mysql/log/mysql-bin.000002 /martin/data/
#mysqlbinlog mysql-bin.000002 >bin.sql
#vim bin.sql

MYSQL入门在bin.sql找到之前的delete语句,删除

MYSQL入门
mysql -uroot -p <bin.sql

MYSQL入门九、确认已恢复数据

MYSQL入门登录mysql

MYSQL入门
#mysql -uroot -p'martin' backup
select * from number;

MYSQL入门
+----+---------------------+
| id | updatetime   |
+----+---------------------+
| 1 | 2016-06-29 23:27:15 |
| 2 | 2016-06-29 23:27:15 |
| 3 | 2016-06-29 23:27:15 |
| 4 | 2016-06-29 23:27:15 |
| 5 | 2016-06-29 23:27:15 |
| 6 | 2016-06-29 23:27:15 |
| 7 | 2016-06-29 23:27:15 |
| 8 | 2016-06-29 23:27:15 |
| 9 | 2016-06-29 23:27:15 |
| 10 | 2016-06-29 23:27:15 |
| 11 | 2016-06-29 23:31:03 |
| 12 | 2016-06-29 23:31:03 |
| 13 | 2016-06-29 23:31:03 |
| 14 | 2016-06-29 23:31:03 |
| 15 | 2016-06-29 23:31:03 |
| 16 | 2016-06-29 23:31:03 |
| 17 | 2016-06-29 23:31:03 |
| 18 | 2016-06-29 23:31:03 |
| 19 | 2016-06-29 23:31:03 |
| 20 | 2016-06-29 23:31:03 |
| 21 | 2016-06-29 23:41:06 |
| 22 | 2016-06-29 23:41:06 |
| 23 | 2016-06-29 23:41:06 |
| 24 | 2016-06-29 23:41:06 |
| 25 | 2016-06-29 23:41:06 |
| 26 | 2016-06-29 23:41:06 |
| 27 | 2016-06-29 23:41:06 |
| 28 | 2016-06-29 23:41:06 |
| 29 | 2016-06-29 23:41:06 |
| 30 | 2016-06-29 23:41:06 |
+----+---------------------+
30 rows in set (0.00 sec)

MYSQL入门恢复完成!以上就是本文的全部内容,在操作数据库时候要多加小心尽量避免误操作,如果万一遇到了,希望本文能够帮助大家.

（编辑：李大同）

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