MyISAM表的.frm文件丢失后的恢复方法：

1、创建实验用的MyISAM表t1，并插入数据：

mysql> create table t1(id int) engine=myisam;

Query OK, 0 rows affected (0.01 sec)

mysql> insert into t1 values(1),(2),(3),(4),(5),(6),(7),(8);

Query OK, 8 rows affected (0.00 sec)

Records: 8 Duplicates: 0 Warnings: 0

2、删除t1表的.frm文件

[root@localhost gusha]# cd /var/lib/mysql/gusha

[root@localhost gusha]# ls

db.opt t1.MYIt1.frm t1.MYD

[root@localhost gusha]# rm -rf t1.frm

此时在gusha库里已经查询不到t1表了：

mysql> show tables;

Empty set (0.00 sec)

还能查询t1表里的内容是因为有缓存，清下缓存：

mysql> select * from t1;

+------+

| id|

+------+

|1 |

|2 |

|3 |

|4 |

|5 |

|6 |

|7 |

|8 |

+------+

8 rows in set (0.00 sec)

mysql> flush tables;

Query OK, 0 rows affected (0.00 sec)

mysql> select * from t1;

ERROR 1146 (42S02): Table 'gusha.t1' doesn't exist

3、进行恢复，把gusha库对应的文件夹里的t1.MYD和t1.MYI文件移动到其它文件夹：

[root@localhost gusha]# mv t1.MY* /var/lib/backup/

[root@localhost gusha]# ls

db.opt

在gusha库里重新创建一个t1表，表结构和原来的t1表一样：

mysql> create table t1(id int) engine=myisam;

Query OK, 0 rows affected (0.00 sec)

把t1.MYD和t1.MYI文件移动会gusha库对应的文件夹：

[root@localhost gusha]# mv /var/lib/backup/t1.MY* .

mv: overwrite `./t1.MYD'? y

mv: overwrite `./t1.MYI'? y

此时MySQL会自动修复t1表

mysql> select * from t1;

+------+

| id|

+------+

|1 |

|2 |

|3 |

|4 |

|5 |

|6 |

|7 |

|8 |

+------+

8 rows in set (0.00 sec)

如果没有自动修复，则执行下面命令进行修复：

mysql> repair table t1;

+----------+--------+----------+----------+

| Table| Op | Msg_type | Msg_text |

+----------+--------+----------+----------+

| gusha.t1 | repair | status| OK|

+----------+--------+----------+----------+

1 row in set (0.00 sec)