Oracle exp imp备份、恢复表空间数据步骤
Oracle 备份分为逻辑备份和物理备份。逻辑备份就是 exp/imp；物理备份有：冷备、热备和 RMAN 备份。exp/imp 有三种模式，表模式、
Oracle 备份分为逻辑备份和物理备份。逻辑备份就是 exp/imp；物理备份有：冷备、热备和 RMAN 备份。exp/imp 有三种模式，表模式、用户模 式和全库模式。
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Oracle中利用expdp/impdp备份数据库的使用说明
1、使用 exp/imp 备份表空间
exp user/password@server file=filefullpathname log=logfullpathname
例如，作者要导出用户名为 bsm，密码为 forebsm，sid 为 bsm 的表空间，Linux平台下使用的命令如下：
exp bsm/forebsm@bsm owner=bsm file=/home/bsm.ump log=/home/bsmexp.log
（bsm/forebsm@bsm
指用户名/密码@实例名，下同）
备份文件 bsm.mmp 将会在目录/home下生成
2、使用 exp/imp 恢复表空间
imp user/password@server ignore=y rows=y full=y commit=y buffer=4096000 file=filefullpathname
仍以上面的例子，将表空间数据恢复，Linux平台命令如下：
imp bsm/forebsm@bsm fromuser=bsm touser=bsm file=/home/bsm.ump log=/home/bsmimp.log
当在两个数据库中移植表空间时，需要注意在后面的哪个数据库中新建表空间需要比原来数据库的表空间大于或等于绝对不能小于，，否则会报错。
后记：exp/imp 进行数据恢复时，三种模式下都需要先建库，然后建立表空间，创建用户，最后使用上面介绍的语句进行恢复。
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