Having both Oracle's and ActiveState's Perl installed is not a probem per se, but you may find that things don't work properly if you're not sure which is in your path first. I remember when Oracle originally - and without notice - decided to include Perl with their RDBMS. Following an upgarde, our Perl code stopped working, and it took a while to figure out why. We just made sure that ActiveState's Perl came first in the path after that...