RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of delete command at 04/25/2014 19:00:37
ORA-19550: cannot use backup/restore functions while using dispatcher

RMAN> register database;

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of register command at 05/07/2007 10:32:31
RMAN-03014: implicit resync of recovery catalog failed
RMAN-03009: failure of full resync command on default channel at 05/07/2007 10:32:31
ORA-19550: cannot use backup/restore functions while using dispatcher

ORA-19550 cannot use backup/restore functions while using dispatcher

Cause	An attempt was made to use backup/restore functions while connected to the dispatcher in a multi-threaded server. This is not allowed because the device that is used for backup and restore must remain allocated to a single process.
Action	Connect directly to the instance then re-execute the backup or restore function.

因db配置为MTS，修改tnsnames.ora文件把connect mode改为dedicated即可。

ITPub博客

ORA-19550: cannot use backup/restore functions while using dispatcher

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