MySQL數(shù)據(jù)庫中數(shù)據(jù)被刪除后的恢復
當數(shù)據(jù)庫被刪除后的恢復方法:
一、首先建立一個測試用的數(shù)據(jù)庫。
[root@CentOS ~]# mysql -u root -p ← 用root登錄到MySQL服務器
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 8 to server version: 4.1.20
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
mysql> create database test; ← 建立一個測試用的數(shù)據(jù)庫test
Query OK, 1 row affected (0.00 sec)
mysql> use test ← 連接到這個數(shù)據(jù)庫
Database changed
mysql> create table test(num int, name varchar(50)); ← 在數(shù)據(jù)庫中建立一個表
Query OK, 0 rows affected (0.07 sec)
mysql> insert into test values(1,'Hello,CentOS'); ← 插入一個值到這個表(這里以“Hello,CentOS”為例)
Query OK, 1 row affected (0.02 sec)
mysql> select * from test; ← 查看數(shù)據(jù)庫中的內容
+------+-----------------+
| num | name |
+------+-----------------+
|1 | Hello,Centos | ← 確認剛剛插入到表中的值的存在
+------+------------------+
1 row in set (0.01 sec)
mysql> exit ← 退出MySQL服務器
Bye
二、然后,運行剛才建立的數(shù)據(jù)庫備份腳本,備份剛剛建立的測試用的數(shù)據(jù)庫。
[root@sample ~]# cd ← 回到腳本所在的root用戶的根目錄
[root@sample ~]# ./mysql-backup.sh ← 運行腳本進行數(shù)據(jù)庫備份
三、接下來,我們再次登錄到MySQL服務器中,刪除剛剛建立的測試用的數(shù)據(jù)庫test,以便于測試數(shù)據(jù)恢復能否成功。
[root@Centos ~]# mysql -u root -p ← 用root登錄到MySQL服務器
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 13 to server version: 4.1.20
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
mysql> use test ← 連接到測試用的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; ← 刪除數(shù)據(jù)中的表
Query OK, 0 rows affected (0.04 sec)
mysql> drop database test; ← 刪除測試用數(shù)據(jù)庫test
Query OK, 0 rows affected (0.01 sec)
mysql> show databases;
+---------------+
| Database |
+---------------+
| mysql | ← 確認測試用的test數(shù)據(jù)庫已不存在、已被刪除
+---------------+
1 row in set (0.01 sec)
mysql> exit ← 退出MySQL服務器
Bye
以上,我們就等于模擬了數(shù)據(jù)庫被破壞的過程。接下來,是數(shù)據(jù)庫被“破壞”后,用備份進行恢復的方法。
[root@Centos ~]# /bin/cp -Rf /backup/mysql/test/ /var/lib/mysql/ ← 復制備份的數(shù)據(jù)庫test到相應目錄
[root@Centos ~]# chown -R mysql:mysql /var/lib/mysql/test/ ← 改變數(shù)據(jù)庫test的歸屬為mysql
[root@Centos ~]# chmod 700 /var/lib/mysql/test/ ← 改變數(shù)據(jù)庫目錄屬性為700
[root@Centos ~]# chmod 660 /var/lib/mysql/test/* ← 改變數(shù)據(jù)庫中數(shù)據(jù)的屬性為660
然后,再次登錄到MySQL服務器上,看是否已經成功恢復了數(shù)據(jù)庫。
[root@CentOS ~]# mysql -u root -p ← 用root登錄到MySQL服務器
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; ← 查看當前存在的數(shù)據(jù)庫
+-------------+
| Database |
+-------------+
| mysql |
| test | ← 確認剛剛被刪除的test數(shù)據(jù)庫已經成功被恢復回來!
+------------+
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)庫中的內容
+------+---------------------+
| num | name |
+------+---------------------+
| 1 | Hello,CentOS | ← 確認數(shù)據(jù)表中的內容與刪除前定義的“Hello,CentOS”一樣!
+------+---------------------+
1 row in set (0.01 sec)
mysql> exit ← 退出MySQL服務器
Bye
以上結果表示,數(shù)據(jù)庫被刪除后,用備份后的數(shù)據(jù)庫成功的將數(shù)據(jù)恢復到了刪除前的狀態(tài)。
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