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Re: [PATCHES] Proposed patch: synchronized_scanning GUCvariable

From: "Zeugswetter Andreas ADI SD" <Andreas(dot)Zeugswetter(at)s-itsolutions(dot)at>
To: "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>,"Euler Taveira de Oliveira" <euler(at)timbira(dot)com>
Cc: "Simon Riggs" <simon(at)2ndquadrant(dot)com>,"Heikki Linnakangas" <heikki(at)enterprisedb(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 GUCvariable
Date: 2008-01-29 15:37:34
Message-ID: E1539E0ED7043848906A8FF995BDA57902C23F2F@m0143.s-mxs.net (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-patches
> > +1. If we go with 'enable_sync_seqcans' for 8.3, and in a future
release 
> > cycle we do test the cases Simon described above and we agree we
need to 
> > do a fine tune to benefit from this feature, we will need to
deprecate 
> > 'enable_sync_seqscans' and invent another one
(sync_seqscans_threshold). 
> > Looking at this perpective, IMHO we should go with the number (0.25)

> > instead of the boolean.
> 
> Surely the risk-of-needing-to-deprecate argument applies ten times
more
> strongly to a number than a boolean.

Yes, I would expect the tuning to be more system than user specific.
So imho a boolean userset would couple well with a tuning guc, that
may usefully not be userset (if we later discover a need for tuning at
all).

so +1 for the bool. 

synchronize[d]_seqscan sounds a bit better in my ears than the plural
synchronize_seqscans.
To me the latter somehow suggests influece on the whole cluster,
probably not 
worth further discussion though, so if someone says no, ok.

Andreas


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