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Re: [PATCHES] Proposed patch: synchronized_scanning GUC variable

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Simon Riggs <simon(at)2ndquadrant(dot)com>, Neil Conway <neilc(at)samurai(dot)com>, Gregory Stark <stark(at)enterprisedb(dot)com>, "Jonah H(dot) Harris" <jonah(dot)harris(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: [PATCHES] Proposed patch: synchronized_scanning GUC variable
Date: 2008-01-31 01:33:33
Message-ID: 200801310133.m0V1XXk20450@momjian.us (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-patches
Tom Lane wrote:
> Simon Riggs <simon(at)2ndquadrant(dot)com> writes:
> > I'm still not very happy with any of the options here.
> 
> > BAS is great if you didn't want to trash the cache, but its also
> > annoying to people that really did want to load a large table into
> > cache. However we set it, we're going to have problems because not
> > everybody has the same database.
> 
> That argument leads immediately to the conclusion that you need
> per-table control over the behavior.  Which maybe you do, but it's
> far too late to be proposing it for 8.3.  We should put this whole
> area of more-control-over-BAS-and-syncscan on the TODO agenda.

Another question --- why don't we just turn off synchronized_seqscans
when we do COPY TO?  That would fix pg_dump and be transparent.

-- 
  Bruce Momjian  <bruce(at)momjian(dot)us>        http://momjian.us
  EnterpriseDB                             http://postgres.enterprisedb.com

  + If your life is a hard drive, Christ can be your backup. +

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