Tom Lane wrote: > Bruce Momjian <[EMAIL PROTECTED]> writes: > > We do have: > > #geqo_random_seed = -1 # -1 = use variable seed > > > that lets you force a specific random seed for testing purposes. I > > wonder if that could be extended to control VACUUM radomization too. > > Right now, it just controls GEQO and in fact gets reset on every > > optimizer run. > > Actually, just the other day I was thinking we should take that out. > Since there is only one random number generator in the C library, > GEQO is messing with everyone else's state every time it decides to do > an srandom(). And there is certainly no need to do an explicit srandom > with a "random" seed every time through the optimizer, which is the > code's default behavior at the moment. That just decreases the > randomness AFAICS, compared to letting the established sequence run.
Agreed. -- Bruce Momjian | http://candle.pha.pa.us [EMAIL PROTECTED] | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073 ---------------------------(end of broadcast)--------------------------- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faqs/FAQ.html
