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basic question (shared buffers vs. effective cache size)

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I have a very basic question on the two parameters shared buffers and effective cache size. I have read articles on what each is about etc. But I still think I don't quite grasp what these settings mean (especially in relation to each other). Since these two settings seem crucial for performance can somebody explain to me the relationship/difference between these two settings and how they deal with shared memory.
Thanks much
Sally


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