RMAN-20002: target database already registered in recovery catalog 解決方法
报错信息：
Starting backup at 20-MAR-08
released channel: gnd
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of backup command at 03/20/2008 17:27:19
RMAN-03014: implicit resync of recovery catalog failed
RMAN-06004: ORACLE error from recovery catalog database: RMAN-20020: database in carnation not set
catalog需要删除然后重新建立。
RMAN> create catalog
recovery catalog already exists
RMAN> register database ;
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of register command on default channel at 03/20/2008 17:30:24
RMAN-20002: target database already registered in recovery catalog
RMAN> drop catalog
recovery catalog owner is RMAN
enter DROP CATALOG command again to confirm catalog removal
RMAN> drop catalog
recovery catalog dropped
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