From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
---|---|
To: | Hannu Krosing <hannu(at)2ndQuadrant(dot)com> |
Cc: | Dimitri Fontaine <dimitri(at)2ndQuadrant(dot)fr>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Robert Haas <robertmhaas(at)gmail(dot)com>, Peter Geoghegan <peter(at)2ndquadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Andrew Dunstan <andrew(at)dunslane(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: [PERFORM] encouraging index-only scans |
Date: | 2013-09-06 13:12:07 |
Message-ID: | 20130906131207.GC600952@alap2.anarazel.de |
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Lists: | pgsql-hackers pgsql-performance |
On 2013-09-06 13:38:56 +0200, Hannu Krosing wrote:
> On 09/06/2013 09:23 AM, Dimitri Fontaine wrote:
> > Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> writes:
> >> I'm not sure if we need to expose all these new maintenance actions as
> >> SQL commands.
> > I strongly think we should, if only for diagnostic purposes.
> It would be much easier and more flexible to expose them
> as pg_*() function calls, not proper "commands".
I don't think that's as easy as you might imagine. For much of what's
done in that context you cannot be in a transaction, you even need to be
in a toplevel statement (since we internally
CommitTransactionCommand/StartTransactionCommand).
So those pg_* commands couldn't be called (except possibly via the
fastpath function call API ...) which might restrict their usefulnes a
teensy bit ;)
So, I think extending the options passed to VACUUM - since it can take
pretty generic options these days - is a more realistic path.
> > Also to
> > adapt to some well defined workloads that the automatic system is not
> > designed to handle.
> +1
What would you like to expose individually?
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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