Postgres performance issues

Question

We are running Postgres 9.1.3 and we have recently started to run into major performance problems on one of our servers.

Our queries ran fine for a while, but as of Augu

Answer 1

I would turn on auto vacuum as well. There are a few variables you can set that control how much the vacuum will interfere. With the amount of RAM you have you should have your shared buffers set between 2048MB - 3276MB. If you have a lot of extra RAM that your system doesn't seem to be using that you don't need elsewhere you should probably set it closer to the higher end. Also you may want to look at your max segment size with sysctl. Your maintenance_work_mem is really high, but if you are doing mostly maintenance then I suppose it isn't as bad as I first thought.