Message-ID: <5229EB6F.4040306@krosing.net>
Date: Fri, 06 Sep 2013 16:49:19 +0200
From: Hannu Krosing <hannu@krosing.net>
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To: Andres Freund <andres@2ndquadrant.com>
CC: Hannu Krosing <hannu@2ndQuadrant.com>,
 Dimitri Fontaine <dimitri@2ndQuadrant.fr>,
 Alvaro Herrera <alvherre@2ndquadrant.com>,
 Bruce Momjian <bruce@momjian.us>, Robert Haas <robertmhaas@gmail.com>,
 Peter Geoghegan <peter@2ndquadrant.com>,
 Tom Lane <tgl@sss.pgh.pa.us>, Andrew Dunstan <andrew@dunslane.net>,
 PostgreSQL-development <pgsql-hackers@postgresql.org>
Subject: Re: [PERFORM] encouraging index-only scans
References: <20121213024837.GB22363@momjian.us>
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 <CAEYLb_U1dTg=bXkDL=yvFTrMw5oC13ivgZA=jdQXnbgaDJ+e-Q@mail.gmail.com>
 <20130904205655.GR21874@momjian.us> <20130906001437.GA29264@momjian.us>
 <CA+Tgmobh_-n-GvKX++DVctToZ9SZkdhvszP=CBjh9XZOvWsTEg@mail.gmail.com>
 <20130906020043.GH27195@momjian.us>
 <20130906052236.GF6067@eldon.alvh.no-ip.org> <m28uza5s7w.fsf@2ndQuadrant.fr>
 <5229BED0.5070506@2ndQuadrant.com>
 <20130906131207.GC600952@alap2.anarazel.de>
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On 09/06/2013 03:12 PM, Andres Freund wrote:
> On 2013-09-06 13:38:56 +0200, Hannu Krosing wrote:
>> On 09/06/2013 09:23 AM, Dimitri Fontaine wrote:
>>> Alvaro Herrera <alvherre@2ndquadrant.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.
Might be something convoluted like 

VACUUM indexname WITH (function = "pg_cleanup_gin($1)");

:)
>
>>> 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
>


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