truncate table 的坑

truncate table，如果数据库硬盘不够用，可能会导致.ibd文件丢失。

适用于：
MySQL服务器版本4.0及以上
本文信息适用于所有平台。
 
症状
当尝试访问表test.t1时，出现以下错误：
150512 16:30:01 [ERROR] MySQL is trying to open a table handle but the .ibd
file for
table te st/t1 does not exist.
Have you deleted the .ibd fil e from the database directory under
the MySQL datadir, or have you used DISCARD TABLESPACE?
See http://dev.mysql.com/doc/refman/5.1/en/innodb‐troubl eshooting.html
how you can resolve the problem.
 
原因
这个问题的原因是缺少相关表t1中的.ibd文件。这表示没有任何语句可以对表T1运行。
由错误本身以及检查该文件是否存在确认：
shell> ls ‐lahR /var/lib/mysql/
/var/lib/mysql/test:
total 21G
drwx‐‐‐‐‐‐ 2 mysql mysql 32K may 12 03:55 .
drwxr‐xr‐x 7 mysql mysql 4,0K nov 10 2014 ..
…
‐rw‐rw‐‐‐‐ 1 mysql mysql 8,6K may 12 03:16 t.frm
‐rw‐rw‐‐‐‐ 1 mysql mysql 20M may 12 13:37 t.ibd
‐rw‐rw‐‐‐‐ 1 mysql mysql 8,5K ago 10 2014 t1.frm
‐rw‐rw‐‐‐‐ 1 mysql mysql 8,5K may 12 03:16 t2.frm
‐rw‐rw‐‐‐‐ 1 mysql mysql 128K may 12 03:16 t2.ibd
…
 
进一步查看MySQL错误日志，当错误开始出现，即truncate table在运行时，就能看到。该语句无法重建各自的.ibd文件，所以文件丢失：
140810 5:05:03 InnoDB: TRUNCATE TABLE test/t1 failed to create a new
tablespace
 
解决方案
重建表：
Drop table:
mysql> DROP TABLE test.t1;
The following error may be seen in the error log afterwards, but it’s basically saying the
tablespace was still present in InnoDB Data Dictionary and that eventually was removed:
150513 14:49:08 InnoDB: Error: table ‘test/t1’
InnoDB: in InnoDB data dictionary has tables pace id 607381,
InnoDB: but tablespace with that id or name does not exist. Have
InnoDB: you deleted or moved .ibd files?
InnoDB: This may also be a table created with CREATE TEMPORARY TABLE
InnoDB: whose .ibd and .frm files MySQL automatically removed, but t he
InnoDB: table still exists in the InnoDB internal data dictionary.
InnoDB: Please refer to
InnoDB: http://dev.mysql .com/doc/refman/5.1/en/innodb‐troubleshootingdatadict.
html
InnoDB: fo r how to resolve the issue.
InnoDB: We removed now the InnoDB int ernal data dictionary entry
InnoDB: of table `test`.`t1`.
 
再次Create table
测试表的访问来确认现在能运行 (ex: optimize table)
mysql> OPTIMIZE TABLE test.t1;

MYSQL会造成隐式提交的语句
MySQL InnoDB 表损坏，显示错误： “MySQL is trying to open a table handle but the .ibd file for table ### does not exist”