mysql恢复drop表

drop误操作删除表后，恢复的大概流程是
1、从备份中将表恢复到备份时间点
2、找到drop操作点
3、从binlog中找到备份点到drop点中间所有事件，并筛选出该表的事件
4、执行找到该表的事件

一、实验数据：
MySQL> select * from sale;

+--------+---------+--------+

| month | user_id | amount |

+--------+---------+--------+

| 201601 | 1 | 500 |

| 201601 | 2 | 300 |

| 201601 | 3 | 500 |

| 201602 | 1 | 1000 |

| 201602 | 2 | 800 |

| 201603 | 2 | 1000 |

| 201603 | 3 | 500 |

| 201604 | 1 | 1000 |

+--------+---------+--------+

8 rows in set (0.00 sec)

二：备份

[root@wd-gtt-system-db data]# mysqldump -S /data/DB/mysql/mysql.sock -h272.30.249.143 -P3306 -uroot -p --single-transaction -B test --tables sale --master-data=2 >/data/backup/mysql_dump.sql

这里一定要加--master-data参数，因为要记录备份时binlog位置

[root@wd-gtt-system-db data]# cat /data/backup/mysql_dump.sql

-- MySQL dump 10.13 Distrib 5.6.27-76.0, for Linux (x86_64)

-- Host: 172.30.249.143 Database: test

-- ------------------------------------------------------

-- Server version 5.6.27-76.0-log

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;

/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;

/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;

/*!40101 SET NAMES utf8 */;

/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;

/*!40103 SET TIME_ZONE='+00:00' */;

/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;

/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;

/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;

/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;

-- Position to start replication or point-in-time recovery from

-- CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000002', MASTER_LOG_POS=309610;

.......

标红处就是备份点，在后面从binlog中找到备份点到drop点中间所有事件用得上

三：增加测试数据并drop表

insert into sale values(201605,'5',10000)

update sale set amount=0 where user_id=1

mysql> select * from sale;

+--------+---------+--------+

| month | user_id | amount |

+--------+---------+--------+

| 201601 | 1 | 0 |

| 201601 | 2 | 300 |

| 201601 | 3 | 500 |

| 201602 | 1 | 0 |

| 201602 | 2 | 800 |

| 201603 | 2 | 1000 |

| 201603 | 3 | 500 |

| 201604 | 1 | 0 |

| 201605 | 5 | 10000 |

+--------+---------+--------+

9 rows in set (0.00 sec)

mysql> drop table sale;

四：从备份中恢复数据到备份点
因为备份的是全库，要从备份中找到sale表相关的建表语句和数据

[root@wd-gtt-system-db ~]# sed -e'/./{H;$!d;}' -e 'x;/CREATE TABLE `sale`/!d;q' /data/backup/mysql_dump.sql

DROP TABLE IF EXISTS `sale`;

/*!40101 SET @saved_cs_client = @@character_set_client */;

/*!40101 SET character_set_client = utf8 */;

CREATE TABLE `sale` (

`month` int(10) DEFAULT NULL,

`user_id` varchar(64) DEFAULT NULL,

`amount` int(11) DEFAULT NULL

) ENGINE=InnoDB DEFAULT CHARSET=utf8;

/*!40101 SET character_set_client = @saved_cs_client */;

[root@wd-gtt-system-db ~]# grep 'INSERT INTO `sale`' /data/backup/mysql_dump.sql>data.sql

[root@wd-gtt-system-db ~]# cat data.sql

INSERT INTO `sale` VALUES (201601,'1',500),(201601,'2',300),(201601,'3',500),(201602,'1',1000),(201602,'2',800),(201603,'2',1000),(201603,'3',500),(201604,'1',1000);

执行上面的语句，查看数据，已经恢复备份点的状态

mysql> select * from sale;

+--------+---------+--------+

| month | user_id | amount |

+--------+---------+--------+

| 201601 | 1 | 500 |

| 201601 | 2 | 300 |

| 201601 | 3 | 500 |

| 201602 | 1 | 1000 |

| 201602 | 2 | 800 |

| 201603 | 2 | 1000 |

| 201603 | 3 | 500 |

| 201604 | 1 | 1000 |

+--------+---------+--------+

8 rows in set (0.00 sec)

五、查询dorp操作的position
因为drop操作是在备份后发生的，加个 --start-position=309610

[root@wd-gtt-system-db mysql]# mysqlbinlog -v -v --base64-output=DECODE-ROWS --set-charset=UTF-8 --start-position=309610 /data/DB/mysql/mysql-bin.000002 |grep DROP -A10 -B10

### @1=201604 /* INT meta=0 nullable=1 is_null=0 */

### @2='1' /* VARSTRING(192) meta=192 nullable=1 is_null=0 */

### @3=0 /* INT meta=0 nullable=1 is_null=0 */

# at 328220

#161220 15:30:49 server id 2 end_log_pos 328251 CRC32 0xb42e62b5 Xid = 8713

COMMIT/*!*/;

# at 328251

#161220 15:31:12 server id 2 end_log_pos328368 CRC32 0xf8c5dde3 Query thread_id=127 exec_time=0 error_code=0

use `test`/*!*/;

SET TIMESTAMP=1482219072/*!*/;

DROP TABLE `sale` /* generated by server */

......

标红的地方表示position=328368 执行的drop操作，我们要恢复到这个之前，也就是328251 这个事件

六：从binlog中找到备份点到drop点中间所有事件
--start-position=备份点
--stop-position=drop操作前的事件点

[root@wd-gtt-system-db mysql]# mysqlbinlog -v -v --base64-output=DECODE-ROWS --set-charset=UTF-8 --start-position=309610 --stop-position=328251 mysql-bin.000002 > recover.sql
检索出sale表相关事件

[root@trcloud opt]# more recover.sql |grep --ignore-case -E 'insert|update|delete' -A2 -B2|grep sale

insert into sale values(201605,'5',10000)

update sale set amount=0 where user_id=1

注：binlog是MIXED或者Statement模式才可通过上述方法找到事件的DML语句
七：执行上面找出来的语句
查看数据，全部恢复

mysql> select * from sale;

+--------+---------+--------+

| month | user_id | amount |

+--------+---------+--------+

| 201601 | 1 | 0 |

| 201601 | 2 | 300 |

| 201601 | 3 | 500 |

| 201602 | 1 | 0 |

| 201602 | 2 | 800 |

| 201603 | 2 | 1000 |

| 201603 | 3 | 500 |

| 201604 | 1 | 0 |

| 201605 | 5 | 10000 |

+--------+---------+--------+

9 rows in set (0.00 sec)

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mysql恢复drop表

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