My project is currently using Sybase 11.9 on an AIX server. The "total memory" configuration parameter is set to 153600 (occupies 300MB RAM). I was wondering how much extra memory the database instance requires once it's up and running for a long period of time. Is there some kind of formula to calculate the extra usage? Another question, if Sybase takes up say an extra 150MB of RAM, will it release it back to the OS?