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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@anarazel.de>
Cc: Michael Paquier <michael@paquier.xyz>
Cc: Dilip Kumar <dilipbalaut@gmail.com>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Cc: Robert Haas <robertmhaas@gmail.com>
Subject: Re: Move pg_attribute.attcompression to earlier in struct for reduced size?
Date: Wed, 26 May 2021 23:34:53 -0400
Message-ID: <1685584.1622086493@sss.pgh.pa.us> (raw)
In-Reply-To: <20210527032105.xistjgattubmjymm@alap3.anarazel.de>
References: <YKsm7qkz+Cq3C3mr@paquier.xyz>
	<CAFiTN-uLQCRLatapZhEaNGH9njY=LndyXJux7H9YCfT9RcE7gA@mail.gmail.com>
	<YKtpZI4PBpVG3ryH@paquier.xyz>
	<CAFiTN-vpHrCzdeyKxpoPViyJCZZx-h8KghQJFyxZd7+Dys6Cow@mail.gmail.com>
	<YKyPM6UC+tBHEuxo@paquier.xyz>
	<20210527003144.xxqppojoiwurc2iz@alap3.anarazel.de>
	<1677691.1622075746@sss.pgh.pa.us>
	<20210527015415.ctuj4yrwnjip5kve@alap3.anarazel.de>
	<20210527021402.b5n2sqw66y2fd6fl@alap3.anarazel.de>
	<1683251.1622083422@sss.pgh.pa.us>
	<20210527032105.xistjgattubmjymm@alap3.anarazel.de>

Andres Freund <andres@anarazel.de> writes:
> Yea, I tested that - it does help in the integer case. But the bigger
> contributors are the loop over the attributes, and especially the access
> to the datum's compression method. Particularly the latter seems hard to
> avoid.

So maybe we should just dump the promise that VACUUM FULL will recompress
everything?  I'd be in favor of that actually, because it seems 100%
outside the charter of either VACUUM FULL or CLUSTER.

			regards, tom lane





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  Subject: Re: Move pg_attribute.attcompression to earlier in struct for reduced size?
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