If you're doing much updating at all you'll also want to bump up checkpoint_segments. I like setting checkpoint_warning just a bit under checkpoint_timeout as a way to monitor how often you're checkpointing due to running out of segments. With a large shared_buffers you'll likely need to make the bgwriter more aggressive as well (increase the max_pages numbers), though how important that is depends on how much updating you're doing. If you see periodic spikes in IO corresponding to checkpoints, that's an indication bgwriter isn't doing a good enough job. If everything ends up in memory, it might be good to decrease random_page_cost to 1 or something close to it; though the database should just rely on effective_cache to figure out that everything's in memory. If you're on pre-8.2, you'll want to cut all the autovacuum parameters in half, if you're using it. -- Jim Nasby jim@xxxxxxxxx EnterpriseDB http://enterprisedb.com 512.569.9461 (cell)
