Simon Riggs <simon@xxxxxxxxxxxxxxx> writes: > On Thu, 2004-11-04 at 15:47, Chris Browne wrote: >> Something like a "read_uncached()" call... >> >> That would mean that a seq scan or a vacuum wouldn't force useful data >> out of cache. > ARC does almost exactly those two things in 8.0. But only for Postgres' own shared buffers. The kernel cache still gets trashed, because we have no way to suggest to the kernel that it not hang onto the data read in. regards, tom lane
