Upgrade from 11.2.0.2 to 11.2.0.4 - Listener Question

Hello,

I'm about to upgrade a number of databases from oracle 11.2.0.2 to 11.2.0.4 on AIX 6.1 and Windows Servers.

Do I shut down the listener in the 11.2.0.2 home before I upgrade the database using the DBUA from the 11.2.0.4 Home ?

if so,  I assume that the DBUA will create another listener with the listener.ora in the 11.2.0.4 home.

I have read a lot of docs but not found or have missed where this is explained.

Thank you for any guidence and your time.