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mysql ibdata1文件的缩小-释放磁盘空间

 

mysql ibdata1文件存放数据,索引等。

如果不把数据库中数据分开存放的话,这个文件的大小很容易就上了G,甚至几十G。对于某些应用、磁盘较小的server来说,并不是太合适。因此要把此文件缩小。

方法:数据文件单独存放。

 

步骤:

1,备份数据库

从命令行进入MySQL Server 5.5/bin

备份全部数据库,执行命令mysqldump -q -uusername -pyourpassword --add-drop-table --all-databases > /all.sql

做完此步后,停止数据库服务。

2,修改mysql配置文件

修改my.ini文件,增加下面配置

iinnodb_file_per_table = 1

对每张表使用单独的innoDB文件, 修改/etc/my.cnf文件

3,删除原数据文件

删除原来的ibdata1文件及日志文件ib_logfile*,删除data目录下的应用数据库文件夹(mysql文件夹不要删)

4,还原数据库

启动数据库服务

从命令行进入MySQL Server 5.5/bin

还原全部数据库,执行命令mysql -uusername -pyourpassword

经过以上几步后,可以看到新的ibdata1文件就只有几十M了,数据及索引都变成了针对单个表的小ibd文件了,它们在相应数据库的文件夹下面。

 

注:目前还没有找到不导出数据再导入,直接缩小ibdata文件体积的办法。对于ibdata文件有坏道、表空间有损坏的数据库来说,只能跳过损坏的id,dump出数据成sql文件,再导入了。

 

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