MySql恢复误删的表或数据(不完全恢复）
一：实验目的
利用mysqldump全备及二进制日志恢复误删的表或数据（不完全恢复）
二：实验步骤
2.1：准备测试数据
use test;
mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| t |
| t3 |
| t4 |
| t5 |
+----------------+
4 rows in set (0.00 sec)
mysql> create table t6(id int);
Query OK, 0 rows affected (0.01 sec)
mysql> insert into t6 values(1);
Query OK, 1 row affected (0.00 sec)
mysql> commit;
Query OK, 0 rows affected (0.00 sec)
mysql> insert into t6 values(2);
Query OK, 1 row affected (0.00 sec)
mysql> commit;
Query OK, 0 rows affected (0.00 sec)
mysql> delete
-> from t6
-> where id=1;
Query OK, 1 row affected (0.00 sec)
mysql> insert into t6 values(3);
Query OK, 1 row affected (0.00 sec)
mysql> insert into t6 values(4);
Query OK, 1 row affected (0.01 sec)
mysql> commit;
Query OK, 0 rows affected (0.00 sec)
mysql> select *
-> from t6;
+------+
| id |
+------+
| 2 |
| 3 |
| 4 |
+------+
3 rows in set (0.00 sec)
mysql> drop table t6;
Query OK, 0 rows affected (0.01 sec)
mysql> select *
-> from t6;
ERROR 1146 (42S02): Table 'test.t6' doesn't exist
2.2：恢复
2.2.1：用最近的一个全备恢复
[root@target_pc ~]# mysql -u root -p test< /backup/databasefile/database_test_201410081042.bak Enter password: --查看此时数据库情况： mysql> use test; 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; +----------------+ | Tables_in_test | +----------------+ | t | | t3 | | t4 | | t5 | +----------------+ 4 rows in set (0.00 sec) 看到，此时还没还原t6。
2.2.2：用二进制日志进行恢复
mysql> show binary logs;
+----------------+-----------+
| Log_name | File_size |
+----------------+-----------+
| log-bin.000006 | 120 |
| log-bin.000007 | 9609 |
| log-bin.000008 | 120 |
| log-bin.000009 | 4904 |
+----------------+-----------+
4 rows in set (0.00 sec)
全备是在log-bin.000007前进行的，所以这里需要恢复二进制日志文件log-bin.000007,log-bin.000008,log-bin.000009
--表t6信息是在log-bin.000009里
2.2.2.1：先恢复log-bin.000007,log-bin.000008
[root@target_pc ~]# mysqlbinlog /var/lib/mysql/log-bin.000007 | mysql -u root -p
Enter password:
[root@target_pc ~]# mysqlbinlog /var/lib/mysql/log-bin.000008 | mysql -u root -p
Enter password:
2.2.2.2：恢复log-bin.000009
2.2.2.2.1：查看log-bin.000009具体内容
--这里只显示关于t6表的内容：
+----------------+------+-------------+-----------+-------------+----------------------------------------------------------------------------------------------------+
| Log_name | Pos | Event_type | Server_id | End_log_pos | Info |
+----------------+------+-------------+-----------+-------------+----------------------------------------------------------------------------------------------------+
| log-bin.000009 | 4599 | Query | 1 | 4696 | use `test`; create table t6(id int) |
| log-bin.000009 | 4696 | Query | 1 | 4775 | BEGIN |
| log-bin.000009 | 4775 | Query | 1 | 4873 | use `test`; insert into t6 values(1) |
| log-bin.000009 | 4873 | Xid | 1 | 4904 | COMMIT /* xid=202 */ |
| log-bin.000009 | 4904 | Query | 1 | 4983 | BEGIN |
| log-bin.000009 | 4983 | Query | 1 | 5081 | use `test`; insert into t6 values(2) |
| log-bin.000009 | 5081 | Xid | 1 | 5112 | COMMIT /* xid=210 */ |
| log-bin.000009 | 5112 | Query | 1 | 5191 | BEGIN |
| log-bin.000009 | 5191 | Query | 1 | 5290 | use `test`; delete
from t6
where id=1 |
| log-bin.000009 | 5290 | Xid | 1 | 5321 | COMMIT /* xid=212 */ |
| log-bin.000009 | 5321 | Query | 1 | 5400 | BEGIN |
| log-bin.000009 | 5400 | Query | 1 | 5498 | use `test`; insert into t6 values(3) |
| log-bin.000009 | 5498 | Xid | 1 | 5529 | COMMIT /* xid=213 */ |
| log-bin.000009 | 5529 | Query | 1 | 5608 | BEGIN |
| log-bin.000009 | 5608 | Query | 1 | 5706 | use `test`; insert into t6 values(4) |
| log-bin.000009 | 5706 | Xid | 1 | 5737 | COMMIT /* xid=214 */ |
| log-bin.000009 | 5737 | Query | 1 | 5852 | use `test`; DROP TABLE `t6` /* generated by server */ |
+----------------+------+-------------+-----------+-------------+----------------------------------------------------------------------------------------------------+
64 rows in set (0.00 sec)
2.2.2.2.2：恢复t6表删除数据前的数据
[root@target_pc ~]# mysqlbinlog /var/lib/mysql/log-bin.000009 --stop-position='5112' | mysql -u root -p
Enter password:
此时，t6有1,2两条数据
mysql> select *
-> from t6;
+------+
| id |
+------+
| 1 |
| 2 |
+------+
2 rows in set (0.00 sec)
2.2.2.2.3：跳过删除语句，恢复剩下的几条插入语句
[root@target_pc ~]# mysqlbinlog /var/lib/mysql/log-bin.000009 --start-position='5400' --stop-position='5737' | mysql -u root -p
Enter password:
此时：
mysql> select *
-> from t6;
+------+
| id |
+------+
| 1 |
| 2 |
| 3 |
| 4 |
+------+
4 rows in set (0.00 sec)
2.2.2.2.4：剩下的是drop table语句，就不恢复了
如果drop table 后有别的数据库DML操作，继续恢复即可。
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