Curt Sampson <[EMAIL PROTECTED]> writes: > This should also allow us to disable completely the ping-pong writes > if we have a disk subsystem that we trust.
If we have a disk subsystem we trust, we just disable fsync on the WAL and the performance issue largely goes away. I concur with Bruce: the reason we keep page images in WAL is to minimize the number of places we have to fsync, and thus the amount of head movement required for a commit. Putting the page images elsewhere cannot be a win AFAICS. > Well, whether or not there's a cheap way depends on whether you consider > fsync to be cheap. :-) It's never cheap :-( regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/users-lounge/docs/faq.html