ORA-19573: cannot obtain exclusive enqueue for datafile XXX解决方法

一个朋友说自己使用RMAN进行恢复datafile 3，出现ORA-19573，不能正常恢复。与朋友沟通，朋友执行恢复的时候，竟还有实例处于OPEN状态。把所有实例mount后，恢复成功

RMAN-00571: ===========================================================

RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============

RMAN-03002: failure of restore command at 07/26/2013 11:45:33

ORA-19870: error while restoring backup piece /rman/backup/data/level0_RACDB_93_1_2tofn3hn_20130726.bak

ORA-19573: cannot obtain exclusive enqueue for datafile3

[oracle@racdb 2 rman]$ oerr ora 19573

19573,00000,"cannot obtain %s enqueue for datafile %s"

// *Cause:The file access enqueue could not be obtained for a file

//specified in a backup,copy or restore operation.

//If the enqueue type shown is 'shared',then the file is the

//input file for a backup or copy.If the type is 'exclusive',then

//the file is the output file for a datafile copy or restore which

//is attempting to overwrite the currently active version of that

//file - in this case,the file must be offline or the database must

//be closed.If the type is 'read-only',then you are attempting

//to back up or copy this file while the database is in NOARCHIVELOG

//mode.

// *Action: Wait until the conflicting operation is complete,then retry

//the copy or backup.If the database is in NOARCHIVELOG mode,102)">//all files being backed up must be closed cleanly.

解决方法：所有实例mount状态下执行恢复！