alter tablespace/database语句中的reuse选项

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例子:

alter tablespace temp add  tempflie   ‘d:\temp1.dbf’   size 100m reuse

 

说明:

The way the database interprets filename also depends on whether you specify it with theSIZE andREUSE clauses.

  • If you specify filename only, or with theREUSE clause but without theSIZE clause, then the file mustalready exist.

  • If you specify filename withSIZE but withoutREUSE, then the file must be a new file.

  • If you specify filename with bothSIZE andREUSE, then the file can be either new or existing. If the file exists, then it is reused with the new size. If it does not exist, then the database ignores theREUSE keyword and creates a new file of the specified size.

注释:

filename指的就是例子中的  ‘d:\temp1.dbf’  。

参考:

http://docs.oracle.com/cd/E11882_01/server.112/e41084/clauses004.htm#CJADEBBF


 

解决办法:异地冷恢复时 如果发现v$datafile里的有些用户用的数据文件没有备份


alterdatabase语句中有reuse选项?那执行该语句后,数据文件到底是属于哪个表空间的?

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