MySQL之truncate表后恢复思路整理（前提是有备份且开启binlog）

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MySQL之truncate表后恢复思路整理（前提是有备份且开启binlog）_MySQL

May 27, 2016 pm 01:46 PM

1.1对数据库thunder进行备份

mysqldump -S /tmp/mysql3316.sock  --single-transaction --master-data=2 thunder &gt;thunder_full_2015112.sql

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1.2进行truncate table操作并insert into table

(work)root@localhost:mysql3316.sock [(none)]&gt;select * from thunder.tb1;
+----+---------+
| id | name    |
+----+---------+
|  1 | test    |
|  4 | thun    |
|  5 | thunder |
|  6 | thun    |
|  7 | thun    |
|  8 | thun    |
|  9 | test    |
+----+---------+
7 rows in set (0.00 sec)
(work)root@localhost:mysql3316.sock [(none)]&gt;truncate table thunder.tb1;
Query OK, 0 rows affected (0.02 sec)
(work)root@localhost:mysql3316.sock [(none)]&gt;insert into thunder.tb1(name) values(&#39;like&#39;);  
Query OK, 1 row affected (0.00 sec)
(work)root@localhost:mysql3316.sock [(none)]&gt;insert into thunder.tb1(name) values(&#39;lik&#39;);
Query OK, 1 row affected (0.00 sec)
(work)root@localhost:mysql3316.sock [(none)]&gt;insert into thunder.tb1(name) values(&#39;li&#39;);
Query OK, 1 row affected (0.00 sec)
(work)root@localhost:mysql3316.sock [(none)]&gt;insert into thunder.tb1(name) values(&#39;l&#39;);
Query OK, 1 row affected (0.00 sec)
(work)root@localhost:mysql3316.sock [(none)]&gt;select * from thunder.tb1;
+----+---------+
| id | name    |
+----+---------+
|  1 | test    |
|  4 | thun    |
|  5 | thunder |
|  6 | thun    |
|  7 | thun    |
|  8 | thun    |
|  9 | test    |
| 10 | like    |
| 11 | lik     |
| 12 | li      |
| 13 | l       |
+----+---------+
11 rows in set (0.00 sec)

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1.3查看备份时binlog位置并找出误操作语句的位置

[root@mysqlnode1 mysql3316]# grep MASTER thunder_full_2015112.sql 
-- CHANGE MASTER TO MASTER_LOG_FILE=&#39;mysql-bin.000003&#39;, MASTER_LOG_POS=25191;
[root@mysqlnode1 ~]# mysql -S /tmp/mysql3316.sock -e &quot;show binlog events in &#39;mysql-bin.000003&#39;&quot;|grep -i truncate
mysql-bin.000003        1011    Query   1163316 1091    truncate mysql.db
mysql-bin.000003        25239   Query   1163316 25328   truncate table thunder.tb1

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1.4用mysqlbinlog命令在binlog中找出相关记录

[root@mysqlnode1 mysql3316]# mysqlbinlog -v --base64-output=decode-rows 
/data/mysql/mysql3316/logs/mysql-bin.000003 &gt;3.sql 
[root@mysqlnode1 mysql3316]# vim 3.sql 
# at 25191
#151122 19:59:50 server id 1163316  end_log_pos 25239 CRC32 0xac936e4e  GTID [commit=yes]
SET @@SESSION.GTID_NEXT= &#39;c009ae77-8def-11e5-ab11-000c29ea831c:78&#39;/*!*/;
# at 25239
#151122 19:59:50 server id 1163316  end_log_pos 25328 CRC32 0xd020ddc8  Query   thread_id=175   exec_time=0    
 error_code=0
SET TIMESTAMP=1448193590/*!*/;
truncate table thunder.tb1
/*!*/;
# at 25328
#151122 20:00:50 server id 1163316  end_log_pos 25376 CRC32 0xa12c299c  GTID [commit=yes]
SET @@SESSION.GTID_NEXT= &#39;c009ae77-8def-11e5-ab11-000c29ea831c:79&#39;/*!*/;
# at 25376
#151122 20:00:50 server id 1163316  end_log_pos 25444 CRC32 0xaa7072db  Query   thread_id=175   exec_time=0    
 error_code=0
SET TIMESTAMP=1448193650/*!*/;
BEGIN
/*!*/;
# at 25444
#151122 20:00:50 server id 1163316  end_log_pos 25496 CRC32 0xd45864c2  Table_map: `thunder`.`
tb1` mapped to number 267
# at 25496
#151122 20:00:50 server id 1163316  end_log_pos 25541 CRC32 0x71343558 
 Write_rows: table id 267 flags: STMT_END_F
### INSERT INTO `thunder`.`tb1`
### SET
###   @1=1
###   @2=&#39;like&#39;
# at 25541
#151122 20:00:50 server id 1163316  end_log_pos 25572 CRC32 0xd860159a  Xid = 4442
COMMIT/*!*/;

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经查看在备份前master status位置后紧跟truncate命令，而后是insert，所以不需要执行binlog增量恢复,只需要把insert的数据还原，此处如果有数据，在导入备份后还需要执行这条语句

mysqlbinlog  --start-position=18311 --stop-position=19557 mysql-bin.000003 |mysql -S /tmp/mysql3316.sock 
thunder

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其中--start-position为数据备份文件中的位置，--stop-position为误操作前的位置

。

1.5新建一个数据库thued，并还原之前thunder库的备份

[root@mysqlnode1 mysql3316]# mysql -S /tmp/mysql3316.sock thued&lt;thunder_full_2015112.sql

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1.6在thued.tb1中插入新增加的数据，并查看

(work)root@localhost:mysql3316.sock [thued]&gt;insert into tb1(name) select name from thunder.tb1;
Query OK, 4 rows affected (0.00 sec)
Records: 4  Duplicates: 0  Warnings: 0
(work)root@localhost:mysql3316.sock [thued]&gt;select * from tb1;                                 
+----+---------+
| id | name    |
+----+---------+
|  1 | test    |
|  4 | thun    |
|  5 | thunder |
|  6 | thun    |
|  7 | thun    |
|  8 | thun    |
|  9 | test    |
| 10 | like    |
| 11 | lik     |
| 12 | li      |
| 13 | l       |
+----+---------+
11 rows in set (0.00 sec)

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1.7删除thunder.tb1，把thued.tb1改名成thunder.tb1

(work)root@localhost:mysql3316.sock [thued]&gt;drop table thunder.tb1;
Query OK, 0 rows affected (0.00 sec)
(work)root@localhost:mysql3316.sock [thued]&gt;rename table thued.tb1 to thunder.tb1;
Query OK, 0 rows affected (0.00 sec)
(work)root@localhost:mysql3316.sock [thued]&gt;select * from thunder.tb1;
+----+---------+
| id | name    |
+----+---------+
|  1 | test    |
|  4 | thun    |
|  5 | thunder |
|  6 | thun    |
|  7 | thun    |
|  8 | thun    |
|  9 | test    |
| 10 | like    |
| 11 | lik     |
| 12 | li      |
| 13 | l       |
+----+---------+
11 rows in set (0.00 sec)

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