Vladimir Churyukin <vladi...@churyukin.com> writes: > There is often a need to test particular queries executed in the worst-case > scenario, i.e. right after a server restart or with no or minimal amount of > data in shared buffers. In Postgres it's currently hard to achieve (other > than to restart the server completely to run a single query, which is not > practical). Is there a simple way to introduce a GUC variable that makes > queries bypass shared_buffers and always read from storage? It would make > testing like that orders of magnitude simpler. I mean, are there serious > technical obstacles or any other objections to that idea in principle?
It's a complete non-starter. Pages on disk are not necessarily up to date; but what is in shared buffers is. regards, tom lane