Keywords and Parameters

Syntax Element	Description
KEEP	Overrides any configured retention policy for this backup or copy so that the backup is not obsolete. The BACKUP ... KEEP command specifies a new retention time for this backup. Use this option to create a long-term backup, that is, a backup that want you to archive.
FOREVER	Specifies that the backup or copy never expires. You must use a recovery catalog when FOREVER is specified, because the backup records eventually age out of the control file.
UNTIL TIME = 'date_string'	Specifies the date until which the backup or copy must be kept. You can either specify a specific time by using the current NLS_DATE_FORMAT, or a SQL date expression, such as 'SYSDATE+365'.
LOGS	Specifies that all of the archived logs required to recover this backup or copy must remain available as long as this backup or copy is available.
NOLOGS	Specifies that this backup or copy cannot be recovered because the archived logs needed to recover this backup will not be kept. The only use for this backup or copy is to restore the database to the point in time that the backup or copy was taken. This is the only valid recoverability option when the database operates in NOARCHIVELOG mode. This option is not valid if the backup or copy is inconsistent.
NOKEEP	Specifies that the backup or copy expires according to the user's retention policy. This is the default behavior. if no KEEP option is specified.

Examples

Making a Long-Term Backup: Example This example makes a long-term backup of the database and specifies that it should never become obsolete and that the logs required to recover it should not be retained:

SHUTDOWN IMMEDIATE;
STARTUP MOUNT;
BACKUP DATABASE
  KEEP FOREVER NOLOGS;
ALTER DATABASE OPEN;

Changing the Status of a Copy: Example This example specifies that any long-term image copies of datafiles and control files should lose their exempt status and so become eligible to be obsolete according to the existing retention policy:

CHANGE COPY OF DATABASE CONTROLFILE NOKEEP; --nokeep就是默认的


--以上的logs就是备份或拷贝对应的归档日志也要可用
--nologs就是用于非归档模式
--until time就是备份集可以一直保存到这个时间
--keep只是针对目前你进行的备份动作进行控制
--forever用于rman catalog中，因为controlfile record最终会age out，呵呵

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oracle10g_rman_语法测试_8

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