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alter tablespace users begin backup;  

cp +DATA/ora11g/USERS.259.833721555 +DATA/ora11g/backup/users.dbf

alter tablespace users end backup;

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col name for a21

select b.file#,d.name,b.status,b.time from v$datafile d join v$backup b on d.file#=b.file#;

SYS@ora11g>desc v$backup  (displays the backup status of all online datafiles.)

 Name                                      Null?    Type

 ----------------------------------------- -------- ----------------------------

 FILE#                                              NUMBER

 STATUS                                             VARCHAR2(18)

 CHANGE#                                            NUMBER

 TIME                                               DATE

FILE#      NUMBER      File identifier

STATUS  VARCHAR2(18)    File status: NOT ACTIVE,ACTIVE (backup in progress),OFFLINE NORMAL, or description of an error.

NOT ACTIVE indicates that the file is not currently in backup mode (that is, an ALTER TABLESPACE ... BEGIN BACKUP or ALTER DATABASE BEGIN BACKUP statement has not been issued), whereas ACTIVE indicates that the file is currently in backup mode.

CHANGE#     NUMBER      System change number when backup started

TIME      DATE      Time the backup started

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原文地址：http://www.cnblogs.com/wwxbi/p/4216785.html