Delete database using DBCA

Hello,
We have two database one is the old one we want to delete, I'm using the DBCA to delete the old database, but when I've selected the old one to delete, I'm getting the error message ORA-01092, and I've seen the oracle instance service for this database is running.
My question is:
should be run the instance oracle service from the database I want to delete?
can be the oracle error ora-01092 because when we did the change to the new database, at the same time we did the upgrade from oracle 10.2.0.3. to 10.2.0.4, and now the old database should be upgraded too although I want to delete it. Because we only did the startup upgrade from the new one.
Regards,
Bea.

user641364 wrote:
Hello,
We have two database one is the old one we want to delete, I'm using the DBCA to delete the old database, but when I've selected the old one to delete, I'm getting the error message ORA-01092, and I've seen the oracle instance service for this database is running.
My question is:
should be run the instance oracle service from the database I want to delete?
can be the oracle error ora-01092 because when we did the change to the new database, at the same time we did the upgrade from oracle 10.2.0.3. to 10.2.0.4, and now the old database should be upgraded too although I want to delete it. Because we only did the startup upgrade from the new one.
Regards,
Bea.You fail to mention your OS, but since you talk about "instance service" I assume you are on Windows, and you are talking about the Windows service that supports the instance.
Have you actually followed through on the usual problem resolution for the reported error? Don't just guess at what causes it in relation to your situation. It's still a well-documented error and the usual possibilities are still in play.
BTW, just because the Windows service is running doesn't mean the database instance is running. In windows, the service is necessary but not sufficient. Go to an OS command prompt. Set ORACLE_SID to the correct value for the instance you want to drop. Do a "sqlplus / as sysdba" and see what you get. Just as a learning experience, once there do a 'shutdown immediate'. When that completes go back to the services control panel and look at the stats of the service. It should still be running.

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