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Session is disconnected after shutting down an instance

I'm having problems with Oracle 10g: after shutting down an instance; the session is disconnected and can't be connected again (the error I get is ORA-12505). The only way I have found to solve it is to reinitialize the Oracle service for that instance. How can this be solved?

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It looks like dynamic registration with the Oracle Listener is not working properly. The first thing to check is that you have your configuration defined properly.

You should have your SERVICE_NAMES and INSTANCE_NAME initialization parameters defined.

After you start the instance, it may take a minute or two from PMON to register the instance with the Listener. By default, PMON will attempt to contact your Listener on the default port (1521). If you are using a non-default port, then you will have to let PMON know where your Listener is listening. To do that, add an entry in your parameter file similar to the following:

LOCAL_LISTENER=listener1

Then bounce the database. The value for the LOCAL_LISTENER parameter should be found in your TNSNAMES.ORA file and the entry should look like the following:

 
listener1=
   (DESCRIPTION=
      (ADDRESS=(PROTOCOL=tcp)(HOST=sales-server)(PORT=1421))      
   )  
You may have to restart your database for all settings to take affect.

This was first published in March 2005

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