MySQL數(shù)據(jù)庫被修改后的恢復(fù)方法
MySQL數(shù)據(jù)庫的恢復(fù),之前已經(jīng)為大家介紹了MySQL數(shù)據(jù)庫中數(shù)據(jù)被刪除后的恢復(fù),本文為大家介紹另外一種恢復(fù)的情況,即MySQL數(shù)據(jù)庫被修改后的恢復(fù)。
當(dāng)數(shù)據(jù)庫被修改后的恢復(fù)方法:
數(shù)據(jù)庫被修改,可能存在著多方面的原因,被入侵、以及相應(yīng)程序存在Bug等等,這里不作詳細(xì)介紹。這里將只介紹在數(shù)據(jù)庫被修改后,如果恢復(fù)到被修改前狀態(tài)的方法。
具體和上面所述的“數(shù)據(jù)庫被刪除后的恢復(fù)方法”相類似。這里,測試用數(shù)據(jù)庫接著使用剛剛在前面用過的test。這里為了使剛剛接觸數(shù)據(jù)庫的朋友不至于理解混亂,我們再次登錄到MySQL服務(wù)器上確認(rèn)一下剛剛建立的測試用的數(shù)據(jù)庫test的相關(guān)信息。
[root@CentOS ~]# mysql -u root -p ← 用root登錄到MySQL服務(wù)器
Enter password: ← 輸入MySQL的root用戶密碼
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 14 to server version: 4.1.20
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
mysql> show databases; ← 查看當(dāng)前存在的數(shù)據(jù)庫
+-------------+
| Database |
+-------------+
| mysql |
| test |
+------------+
2 rows in set (0.00 sec)
mysql> use test ← 連接到test數(shù)據(jù)庫
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> show tables; ← 查看test數(shù)據(jù)庫中存在的表
+-------------------+
| Tables_in_test |
+-------------------+
| test |
+-------------------+
1 row in set (0.00 sec)
mysql> select * from test; ← 查看數(shù)據(jù)庫中的內(nèi)容
+------+--------------------+
| num | name |
+------+--------------------+
| 1 | Hello,CentOS|
+------+--------------------+
1 row in set (0.01 sec)
mysql> exit ← 退出MySQL服務(wù)器
Bye
然后,我們再次運(yùn)行數(shù)據(jù)庫備份腳本,將當(dāng)前狀態(tài)的數(shù)據(jù)庫,再做一次備份。
[root@CentOS ~]# cd ← 回到腳本所在的root用戶的根目錄
[root@CentOS ~]# ./mysql-backup.sh ← 運(yùn)行腳本進(jìn)行數(shù)據(jù)庫備份
接下來,我們再次登錄到MySQL服務(wù)器中,對測試用的數(shù)據(jù)庫test進(jìn)行一些修改,以便于測試數(shù)據(jù)恢復(fù)能否成功。
[root@sample ~]# mysql -u root -p ← 用root登錄到MySQL服務(wù)器
Enter password: ← 輸入MySQL的root用戶密碼
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 15 to server version: 4.1.20
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
mysql> use test ← 連接到test數(shù)據(jù)庫
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> update test set name='Shit,Windows'; ← 然后將test中表的值重新定義為“Shit,Windows”(原來為“Hello,CentOS”)
Query OK, 1 row affected (0.07 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> select * from test; ← 確認(rèn)test中的表被定義的值
+------+--------------------+
| num | name |
+------+-------------------+
| 1 | Shit,Windows | ← 確認(rèn)已經(jīng)將原test數(shù)據(jù)庫表中的值修改為新的值“Shit,Windows”
+------+-------------------+
1 row in set (0.00 sec)
mysql> exit ← 退出MySQL服務(wù)器
Bye
以上,我們就等于模擬了數(shù)據(jù)庫被篡改的過程。接下來,是數(shù)據(jù)庫被“篡改”后,用備份進(jìn)行恢復(fù)的方法。
[root@CentOS ~]# /bin/cp -Rf /backup/mysql/test/ /var/lib/mysql/ ← 復(fù)制備份的數(shù)據(jù)庫test到相應(yīng)目錄
然后,再次登錄到MySQL服務(wù)器上,看數(shù)據(jù)庫是否被恢復(fù)到了被“篡改”之前的狀態(tài)。
[root@CentOS ~]# mysql -u root -p ← 用root登錄到MySQL服務(wù)器
Enter password: ← 輸入MySQL的root用戶密碼
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 16 to server version: 4.1.20
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
mysql> use test ← 連接到test數(shù)據(jù)庫
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> select * from test; ← 查看數(shù)據(jù)庫中的內(nèi)容
+------+----------------+
| num | name |
+------+----------------+
| 1| Hello,CentOS | ← 確認(rèn)數(shù)據(jù)表中的內(nèi)容與被修改前定義的“Hello,CentOS”一樣!
+------+----------------+
1 row in set (0.01 sec)
mysql> exit ← 退出MySQL服務(wù)器
Bye
以上結(jié)果表示,數(shù)據(jù)庫被修改后,用備份后的數(shù)據(jù)庫成功的將數(shù)據(jù)恢復(fù)到了被“篡改”前的狀態(tài)。
測試后…
測試完成后,將測試用過的遺留信息刪除。
[root@CentOS ~]# mysql -u root -p ← 用root登錄到MySQL服務(wù)器
Enter password: ← 輸入MySQL的root用戶密碼
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 19 to server version: 4.1.20
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
mysql> use test ← 連接到test數(shù)據(jù)庫
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> drop table test; ← 刪除test數(shù)據(jù)庫中的表
Query OK, 0 rows affected (0.01 sec)
mysql> drop database test; ← 刪除測試用數(shù)據(jù)庫test
Query OK, 0 rows affected (0.00 sec)
mysql> show databases; ← 查看當(dāng)前存在的數(shù)據(jù)庫
+-------------+
| Database |
+-------------+
| mysql | ← 確認(rèn)測試用數(shù)據(jù)庫test不存在、已被刪除
+-------------+
1 row in set (0.00 sec)
mysql> exit ← 退出MySQL服務(wù)器
Bye
如果大家以后在工作中遇到MySQL數(shù)據(jù)庫被修改,通過本文的學(xué)習(xí),到時候就能很輕松的應(yīng)對,利用上文中介紹的進(jìn)行數(shù)據(jù)庫的恢復(fù)。
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