2017-08-31 14:18:05 4122 [Note] InnoDB: Database was not shutdown normally!
2017-08-31 14:18:05 4122 [Note] InnoDB: Starting crash recovery.
2017-08-31 14:18:05 4122 [Note] InnoDB: Reading tablespace information from the .ibd files...
2017-08-31 14:18:05 4122 [ERROR] InnoDB: Attempted to open a previously opened tablespace. Previous tablespace dev/tb_test uses spac
e ID: 1 at filepath: ./dev/tb_test.ibd. Cannot open tablespace mysql/innodb_table_stats which uses space ID: 1 at filepath: ./mysql/
innodb_table_stats.ibd
2017-08-31 14:18:05 2ad861898590  InnoDB: Operating system error number 2 in a file operation.
InnoDB: The error means the system cannot find the path specified.
InnoDB: If you are installing InnoDB, remember that you must create
InnoDB: directories yourself, InnoDB does not create them.
InnoDB: Error: could not open single-table tablespace file ./mysql/innodb_table_stats.ibd
InnoDB: We do not continue the crash recovery, because the table may becomeInnoDB: corrupt if we cannot apply the log records in the InnoDB log to it.
InnoDB: To fix the problem and start mysqld:
InnoDB: 1) If there is a permission problem in the file and mysqld cannot
InnoDB: open the file, you should modify the permissions.
InnoDB: 2) If the table is not needed, or you can restore it from a backup,
InnoDB: then you can remove the .ibd file, and InnoDB will do a normal
InnoDB: crash recovery and ignore that table.
InnoDB: 3) If the file system or the disk is broken, and you cannot remove
InnoDB: the .ibd file, you can set innodb_force_recovery > 0 in my.cnf
InnoDB: and force InnoDB to continue crash recovery here.
150126 14:18:06 mysqld_safe mysqld from pid file /home/mysql/mysql_app/dbdata/liuyazhuang136.pid ended

二、解決方案

1.在my.cnf中添加如下參數

在[mysqld]組中加入：

innodb_force_recovery=6

innodb_force_recovery參數解釋：
innodb_force_recovery影響整個InnoDB存儲引擎的恢復狀況，默認值為0，表示當需要恢復時執行所有的恢復操作。
當不能進行有效的恢復操作時，mysql有可能無法啟動，并記錄下錯誤日志。
innodb_force_recovery可以設置為1-6,大的數字包含前面所有數字的影響。
當設置參數值大于0后，可以對表進行select,create,drop操作,但insert,update或者delete這類操作是不允許的。
1(SRV_FORCE_IGNORE_CORRUPT):忽略檢查到的corrupt頁
2(SRV_FORCE_NO_BACKGROUND):阻止主線程的運行，如主線程需要執行full purge操作，會導致crash
3(SRV_FORCE_NO_TRX_UNDO):不執行事務回滾操作。
4(SRV_FORCE_NO_IBUF_MERGE):不執行插入緩沖的合并操作。
5(SRV_FORCE_NO_UNDO_LOG_SCAN):不查看重做日志，InnoDB存儲引擎會將未提交的事務視為已提交。
6(SRV_FORCE_NO_LOG_REDO):不執行前滾的操作。

2.備份數據庫

$mysqldump -h 192.168.209.136 -uroot -p dev > /home/mysql/dev.sql

3.刪除數據庫

$mysql -h 192.168.209.136 -uroot -p
mysql> drop database dev;
ERROR 1051 (42S02): Unknown table 'dev.tb_test'

物理刪除tb_test對應的frm和ibd文件

mysql> drop database dev;
Query OK, 0 rows affected (0.00 sec)

4.創建數據庫

mysql> create database dev;
Query OK, 1 row affected (0.03 sec)

5.去掉參數innodb_force_recovery
將之前設置的參數去掉后，重新啟動數據庫

##innodb_force_recovery=6

6.導入數據

[mysql@liuyazhuang136 dev]$ mysql -h 192.168.209.136 -uroot -pmysql dev</home/mysql/dev.sql
Warning: Using a password on the command line interface can be insecure.
ERROR 1050 (42S01) at line 25: Table '`dev`.`tb_test`' already exists

提示表已經存在，這是因為將innodb_force_recovery參數去掉后，數據庫會進行回滾操作，會生成相應的ibd文件，所有需要將該文件刪除掉.
刪除后重新導入

[mysql@liuyazhuang136 dev]$ mysql -h 192.168.209.136 -uroot -pmysql dev</home/mysql/dev.sql

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