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Why does RMAN automatically attempt to connect to the database?

Ruthsarian Member Posts: 1 Red Ribbon

I am on a RHEL server with Oracle 19c. I issue the command 'rman' with no parameters. I am expecting to receive an RMAN> prompt at which point I can issue a connect command.

However RMAN immediately connects to whatever database I have specified by ORACLE_SID. Furthermore, if I unset ORACLE_SID and issue an 'rman' command with no parameters, I get an 'ORA_12162: TNS:net service name is incorrectly specified' error and no RMAN> prompt.

Why is this happening and how can I prevent rman from automatically attempting to connect to a database at startup?