I spend a lot of time answering questions about PostgreSQL, and one of the questions I get asked frequently is: how should I set shared_buffers? And, a bit less often, how should I set wal_buffers? I've got canned answers that I can rattle off so fast it'll make your head spin. Exceptions to my canned answers keep popping up, and it's starting to get hard to give an answer that actually captures all the complexity in this area, so here's a longer explanation.
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