Tony Capobianco <tcapobia...@prospectiv.com> wrote: > According to some documentation, I want to set > effective_cache_size to my OS disk cache + shared_buffers. That seems reasonable, and is what has worked well for me. > In this case, I have 4 quad-core processors with 512K cache (8G) > and my shared_buffers is 7680M. Therefore my effective_cache_size > should be approximately 16G? I didn't follow that at all. Can you run `free` or `vmstat`? If so, go by what those say your cache size is. > Most of our other etl processes are running fine, however I'm > curious if I could see a significant performance boost by reducing > the effective_cache_size. Since it is an optimizer costing parameter and has no affect on memory allocation, you can set it on a connection and run a query on that connection to test the impact. Why wonder about it when you can easily test it? -Kevin
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