Oracle 8.1.7.2 patch & databases running under 8.1.5
I have a databse running under Oracle 8.1.5. I have installed 8.1.7.0 to the server, and have the listener running for 8.1.5 databases under 8.1.7.0. I have to apply patchset 8.1.7.2.
Can I switch the listener back to run under 8.1.5 for the databases in 8.1.5? Can I install the patch 8.1.7.2 to the server without affecting current connections made while the listener was up in 8.1.7, as well as the 8.1.5 listener? Thanks in advance...