mysql ibdata1文件的缩小-释放磁盘空间_MySQL
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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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