Error: RMAN-06445: cannot connect to recovery catalog after NOCATALOG has been used
Cause:
1. We can not connect to a catalog, after we started RMAN with the NOCATALOG option.
2. If we executed some command that used control file to show the results, and after this if we try to connect to the catalog.
For example As, 'list backup summary;' and after this, We try 'connect catalog rman/rman@rmandb;', this return the RMAN-06445 error.
Alternatively use rman target / catalog rman/rmanpwd@rmandb;