MySQL之delete 忘加where條件誤刪除恢復
mysql數據庫指定字符集位utf8,同時表的字符集也得為utf8,同時mysql要開啟row模式的bin-log日誌
/etc/my.cnf文件字符集參數設置:
[root@git-server ~]# grep character-set /etc/my.cnf
[client]
port = 3306
socket = /tmp/mysql.sock
default-character-set=utf8
[mysqld]
port = 3306
socket = /tmp/mysql.sock
character-set-server = utf8
同時要求表的字符集也是utf8的
MySQL [zixun3]> show create table zixun3.zx_scores\G *************************** 1. row *************************** Table: zx_scores Create Table: CREATE TABLE `zx_scores` ( `id` int(11) unsigned NOT NULL AUTO_INCREMENT, `titles` char(15) NOT NULL, `icon` smallint(6) unsigned DEFAULT ‘0‘, `integral` int(10) NOT NULL DEFAULT ‘0‘, `isdefault` tinyint(1) unsigned NOT NULL DEFAULT ‘0‘, PRIMARY KEY (`id`), KEY `integral` (`integral`) ) ENGINE=MyISAM AUTO_INCREMENT=16 DEFAULT CHARSET=utf8 1 row in set (0.00 sec)
如果表的字符集不是uft8的話要修改表的字符集位uft8,否則在mysqlbinlog 解析出來的sql文件對於中文漢字的會出現亂碼,導致最後恢復到線上的表中報錯
修改表的字符集位utf8:MySQL [zixun3]> alter table zx_scores convert to character set utf8;
二、事故處理:
2018-05-16開發在delete刪除數據時忘記加條件,直接執行delete from zx_scores ,導致此表中的數據全部刪除
MySQL [zixun3]> delete from zx_scores; Query OK, 6 rows affected (0.00 sec) MySQL [zixun3]> select * from zx_scores; Empty set (0.00 sec)
以下是恢復誤刪數據的過程:
首先要確定delete誤操作寫進了那個binlog二進制日誌文件裏面,然後從這個二進制日誌中恢復相關行操作。因為啟用的是row行格式,所有的每條記錄
的修改等等操作都會記錄在二進制日誌裏面。
MySQL [zixun3]> show master status\G
*************************** 1. row ***************************
File: mysql-bin.000036
Position: 7620
Binlog_Do_DB:
Binlog_Ignore_DB:
Executed_Gtid_Set:
1 row in set (0.00 sec)
MySQL [zixun3]>
如果沒有其他人flush logs的話,誤操作就記錄在mysql_bin.000036這個二進制日誌文件中。如果有他人flush logs。就往以上找。直到發現誤操作的記錄。
開始恢復,在線上的話,應該比較復雜,要先進行鎖表,以免數據再次被汙染。(鎖表,查看正在寫哪個二進制日誌)
mysql> lock table zixun3.zx_scores read;
Query OK, 0 rows affected (0.00 sec)
MySQL [zixun3]> show master status\G
*************************** 1. row ***************************
File: mysql-bin.000036
Position: 7620
Binlog_Do_DB:
Binlog_Ignore_DB:
Executed_Gtid_Set:
1 row in set (0.00 sec)
MySQL [zixun3]>
把binlog日誌 中2018年05月16日的delete語句提取出來 供恢復數據
/usr/local/mysql/bin/mysqlbinlog --no-defaults --base64-output=decode-rows -v -v -v /data/mysql/data/mysql-bin.000036 >/tmp/info.txt
cat /tmp/info.txt |awk -F ‘[/*]+‘ ‘{print $1}‘ >/tmp/info1.txt
經過上述2個命令處理,得到的最終的binlog日誌文件的sql為如下:
[root@git-server ~]# cat /tmp/info1.txt
DELIMITER
#at 4
#180516 23:15:16 server id 1 end_log_pos 120 CRC32 0x183f4334 Start: binlog v 4, server v 5.6.36-log created 180516 23:15:16 at startup
#Warning: this binlog is either in use or was not closed properly.
ROLLBACK
#at 120
#180516 23:15:39 server id 1 end_log_pos 194 CRC32 0x0a6c78ee Query thread_id=1 exec_time=0 error_code=0
SET TIMESTAMP=1526483739
SET @@session.pseudo_thread_id=1
SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=0, @@session.unique_checks=1, @@session.autocommit=1
SET @@session.sql_mode=1075838976
SET @@session.auto_increment_increment=1, @@session.auto_increment_offset=1
SET @@session.character_set_client=33,@@session.collation_connection=33,@@session.collation_server=33
SET @@session.lc_time_names=0
SET @@session.collation_database=DEFAULT
BEGIN
#at 194
#180516 23:15:39 server id 1 end_log_pos 254 CRC32 0x10198556 Table_map: `zixun3`.`zx_scores` mapped to number 70
#at 254
#180516 23:15:39 server id 1 end_log_pos 517 CRC32 0x59f30b1c Delete_rows: table id 70 flags: STMT_END_F
### DELETE FROM `zixun3`.`zx_scores`
### WHERE
### @1=15
### @2=‘大將‘
### @3=12
### @4=29000
### @5=1
### DELETE FROM `zixun3`.`zx_scores`
### WHERE
### @1=12
### @2=‘上將‘
### @3=11
### @4=24000
### @5=1
### DELETE FROM `zixun3`.`zx_scores`
### WHERE
### @1=11
### @2=‘中將‘
### @3=10
### @4=19000
### @5=1
### DELETE FROM `zixun3`.`zx_scores`
### WHERE
### @1=10
### @2=‘少將‘
### @3=9
### @4=14000
### @5=1
### DELETE FROM `zixun3`.`zx_scores`
### WHERE
### @1=9
### @2=‘上校‘
### @3=8
### @4=9000
### @5=1
### DELETE FROM `zixun3`.`zx_scores`
### WHERE
### @1=8
### @2=‘中校‘
### @3=7
### @4=6000
### @5=1
### DELETE FROM `zixun3`.`zx_scores`
### WHERE
### @1=7
### @2=‘少校‘
### @3=6
### @4=5000
### @5=1
### DELETE FROM `zixun3`.`zx_scores`
### WHERE
### @1=6
### @2=‘上尉‘
### @3=5
### @4=4000
### @5=1
### DELETE FROM `zixun3`.`zx_scores`
### WHERE
### @1=5
### @2=‘中尉‘
### @3=4
### @4=3000
### @5=1
### DELETE FROM `zixun3`.`zx_scores`
### WHERE
### @1=4
### @2=‘少尉‘
### @3=3
### @4=2000
### @5=1
### DELETE FROM `zixun3`.`zx_scores`
### WHERE
### @1=3
### @2=‘班長‘
### @3=2
### @4=1000
### @5=1
### DELETE FROM `zixun3`.`zx_scores`
### WHERE
### @1=2
### @2=‘列兵‘
### @3=1
### @4=0
### @5=1
#at 517
#180516 23:15:39 server id 1 end_log_pos 592 CRC32 0x36661206 Query thread_id=1 exec_time=0 error_code=0
SET TIMESTAMP=1526483739
COMMIT
DELIMITER ;
#End of log file
ROLLBACK
三、已刪除數據的提取腳本
[root@git-server ~]# cat /tmp/test.sh
#!/bin/bash
#bl表列數(表字段) #語句yj
bl=5
yj=DELETE
zs1=`awk ‘/#180516/,/#180517/ {print $0}‘ /tmp/info1.txt|awk ‘"/$yj/",/# at/ {print $0}‘|grep ^###|grep "@"|cut -d"=" -f2`
zs2=`echo $zs1|awk ‘{print NF}‘`
zt=`echo "$zs2/$bl"|bc`
hs=0
##databa指數據庫 ###tab指表 ###a1--a5指的是此表一共有5個字段
databa=zixun3
tab=zx_scores
ztt=$(($zt+0))
ii=0
a1=1
a2=2
a3=3
a4=4
a5=5
while [[ $ii -lt $ztt ]];do
l1=`echo $zs1|awk ‘{print $‘"$a1"‘}‘`
l2=`echo $zs1|awk ‘{print $‘"$a2"‘}‘`
l3=`echo $zs1|awk ‘{print $‘"$a3"‘}‘`
l4=`echo $zs1|awk ‘{print $‘"$a4"‘}‘`
echo "use $databa;insert into $tab values($l1,$l2,$l3,$l4,$l5)" >>/tmp/hf
a1=$(($a1+$bl))
a2=$(($a2+$bl))
a3=$(($a3+$bl))
a4=$(($a4+$bl))
a5=$(($a5+$bl))
ii=$(($ii+1));
done
四、執腳本提取數據成功
[root@git-server ~]# sh /tmp/test.sh
[root@git-server ~]# cat /tmp/hf
use zizun3;insert into zx_scores values(15,‘大將‘,12,29000,1);
use zizun3;insert into zx_scores values(12,‘上將‘,11,24000,1);
use zizun3;insert into zx_scores values(11,‘中將‘,10,19000,1);
use zizun3;insert into zx_scores values(10,‘少將‘,9,14000,1);
use zizun3;insert into zx_scores values(9,‘上校‘,8,9000,1);
use zizun3;insert into zx_scores values(8,‘中校‘,7,6000,1);
use zizun3;insert into zx_scores values(7,‘少校‘,6,5000,1);
use zizun3;insert into zx_scores values(6,‘上尉‘,5,4000,1);
use zizun3;insert into zx_scores values(5,‘中尉‘,4,3000,1);
use zizun3;insert into zx_scores values(4,‘少尉‘,3,2000,1);
use zizun3;insert into zx_scores values(3,‘班長‘,2,1000,1);
use zizun3;insert into zx_scores values(2,‘列兵‘,1,0,1);
五、恢復數據到數據庫中
MySQL [zixun3]> insert into zx_scores values(12,‘上將‘,11,24000,1);
Query OK, 1 row affected (0.00 sec)
MySQL [zixun3]> insert into zx_scores values(11,‘中將‘,10,19000,1);
Query OK, 1 row affected (0.00 sec)
MySQL [zixun3]> insert into zx_scores values(10,‘少將‘,9,14000,1);
Query OK, 1 row affected (0.00 sec)
MySQL [zixun3]> insert into zx_scores values(9,‘上校‘,8,9000,1);
Query OK, 1 row affected (0.00 sec)
MySQL [zixun3]> insert into zx_scores values(8,‘中校‘,7,6000,1);
Query OK, 1 row affected (0.00 sec)
MySQL [zixun3]> insert into zx_scores values(7,‘少校‘,6,5000,1);
Query OK, 1 row affected (0.00 sec)
MySQL [zixun3]> insert into zx_scores values(6,‘上尉‘,5,4000,1);
Query OK, 1 row affected (0.00 sec)
MySQL [zixun3]> insert into zx_scores values(5,‘中尉‘,4,3000,1);
Query OK, 1 row affected (0.00 sec)
MySQL [zixun3]> insert into zx_scores values(4,‘少尉‘,3,2000,1);
Query OK, 1 row affected (0.00 sec)
MySQL [zixun3]> insert into zx_scores values(3,‘班長‘,2,1000,1);
Query OK, 1 row affected (0.00 sec)
MySQL [zixun3]> insert into zx_scores values(2,‘列兵‘,1,0,1);
Query OK, 1 row affected (0.00 sec)
MySQL [zixun3]> select * from zx_scores ;
+----+--------+------+----------+-----------+
| id | titles | icon | integral | isdefault |
+----+--------+------+----------+-----------+
| 2 | 列兵 | 1 | 0 | 1 |
| 3 | 班長 | 2 | 1000 | 1 |
| 4 | 少尉 | 3 | 2000 | 1 |
| 5 | 中尉 | 4 | 3000 | 1 |
| 6 | 上尉 | 5 | 4000 | 1 |
| 7 | 少校 | 6 | 5000 | 1 |
| 8 | 中校 | 7 | 6000 | 1 |
| 9 | 上校 | 8 | 9000 | 1 |
| 10 | 少將 | 9 | 14000 | 1 |
| 11 | 中將 | 10 | 19000 | 1 |
| 12 | 上將 | 11 | 24000 | 1 |
| 15 | 大將 | 12 | 29000 | 1 |
+----+--------+------+----------+-----------+
12 rows in set (0.00 sec)
到此處刪除的數據已經恢復完成。
提示:經過多次測試,此腳本在恢復數據時,對數據庫的表結構是有要求的 ,並不是誤刪了任何的表結構中的數據來采用此腳本都可以恢復的,所以此腳本具有很大的局限性。
自腳本只能是恢復簡單的表字段的表中被誤刪的數據
MySQL之delete 忘加where條件誤刪除恢復