ORA-19573: cannot obtain exclusive enqueue for datafile 1

还原Oracle数据库时出现ORA-19870和ORA-19573错误，如：

RMAN> restore database;

Starting restore at 11-DEC-12 using channel ORA_DISK_1

channel ORA_DISK_1: starting datafile backupset restore channel ORA_DISK_1: specifying datafile(s) to restore from backup set restoring datafile 00001 to /u02/oradata/orcl/system01.dbf restoring datafile 00002 to /u02/oradata/orcl/undotbs01.dbf restoring datafile 00003 to /u02/oradata/orcl/sysaux01.dbf restoring datafile 00004 to /u02/oradata/orcl/users01.dbf restoring datafile 00005 to /u02/oradata/orcl/dolphin01.dbf channel ORA_DISK_1: reading from backup piece /home/oracle/backup/dbf_07nsjs47_1_1.bak RMAN-00571: =========================================================== RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS =============== RMAN-00571: =========================================================== RMAN-03002: failure of restore command at 12/11/2012 16:07:19

ORA-19870: error reading backup piece /home/oracle/backup/dbf_07nsjs47_1_1.bak

ORA-19573: cannot obtain exclusive enqueue for datafile 1

该问题的原因是由于数据库处于open状态导致的，将数据库置于mount状态该问题即可解决

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