I was reading up on tips and techniques for performance tunning databases. I got to a section that talked about Hit Ratio and using it to track performance. I was wondering if anyone uses it and could elaborate on their experience with it. I am 10g release level is 10.2.040 and we are in a UNIX AIX environment. My production database is about 140 gigs. I have been the DBA here for about a month or so and the don't really complain about DB performance (knock on wood). I have een monitoring the system and don't really see any spikes in performance. I am just trying to be pro-active