On Thu, Jul 9, 2015 at 10:56 AM, Andres Freund <andres@anarazel.de> wrote: > > On 2015-07-09 10:39:35 -0300, Fabrízio de Royes Mello wrote: > > If the "wal_level=minimal" we don't need to force the wal log of the > > contents. If the "wal_level != minimal" we need just to xlog all the pages, > > but in both cases we don't need the extra job to create a new datafiles and > > copy the contents between them. So we'll improve performance, or am I > > missing something? > > Sure. It'll be a bit faster. I just don't see the peformance increase in > not that common situations being worth the price we'll pay in > development, code review, debugging and then maintaining some nontrivial > code. If this were likely to be a 15 line patch, I'd think differently.
Well, this will not be a 15 line patch, but I'll try to simplify as much as possible.