The old newsgroups are archived at: http://nntp-archive.sybase.com/nntp-archive/action/product/detail/14
One way you can search them is to use the site:<siteaddress> syntax for a google search. For example:
site:nntp-archive.sybase.com powerbuilder oracle connection
Which then becomes: https://www.google.com/search?q=site%3Anntp-archive.sybase.com+powerbuilder+oracle+connection