现象：
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 01/12/2013 21:16:08
ORA-19870: error reading backup piece /u01/rmanbak/for18dg/standby_PORT_20130112_1fnv8622_1_1.bak
ORA-19573: cannot obtain exclusive enqueue for datafile 26
RMAN>
原因：数据库处于OPEN状态
处理方法：
shutdown immediate;
startup mount;
本文转自zylhsy 51CTO博客，原文链接：http://blog.51cto.com/yunlongzheng/1117089，如需转载请自行联系原作者
