Using Oracle 9 once I have more than 8 database in the same server pentium IV 512 memory (big pagefile sys). obviously it was for test. Our customer, some of them has from 2 to 5 databases in the same server (real server), in production, our system is small obviously, but not too small between 5 to 200 simulatenous processes. I never saw a problem, not if in the same server you use 9i and 10g (different homes), no idea, but there is a posibility all will work ok. Juan Carlos Reyes Pacheco OCP -- //www.freelists.org/webpage/oracle-l