Hi all, I'm testing different configurations of postgresql 8.1 running on debian. The method I was following was: - change the postgresql.conf - restart postgres (/etc/init.d/postgresql restart ) - execute my test queries I have noticed that this is not enough to flush the cache, I don't know where it is, if at the raid controller, at OS or at postgresql itself. Reboot the machine I don't think it's a good solution because it takes quite long. Do you have any suggestion? BTW is there any tool to stress the DB, I mean, create a set of queries to execute and throw a configurable set of concurrent connections to check the performance? Thanks to all