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From: Jeff Davis <[email protected]>
To: Andres Freund <[email protected]>
To: Corey Huinker <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: Michael Paquier <[email protected]>
Cc: jian he <[email protected]>
Cc: Nathan Bossart <[email protected]>
Cc: Bruce Momjian <[email protected]>
Cc: Matthias van de Meent <[email protected]>
Cc: Magnus Hagander <[email protected]>
Cc: Stephen Frost <[email protected]>
Cc: Ashutosh Bapat <[email protected]>
Cc: Peter Smith <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Cc: [email protected]
Subject: Re: Statistics Import and Export
Date: Mon, 24 Feb 2025 13:01:00 -0800
Message-ID: <[email protected]> (raw)
In-Reply-To: <curtrasm6ylt7es2ukfuals2mh5an72yzxgvyel65mw3ere7qs@nw6m4ffpo4m3>
References: <CADkLM=f0a43aTd88xW4xCFayEF25g-7hTrHX_WhV40HyocsUGg@mail.gmail.com>
	<[email protected]>
	<CADkLM=ckXu5wzSQZ3Y_fvAaL8rZ+upZdSecBLf5FCTMj7M6T-A@mail.gmail.com>
	<[email protected]>
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	<y2d36zf6pl3n6ni6e4ctblu3a5iazi2dycknq53h2mjvp7lto4@hhww3h2qgdrw>
	<[email protected]>
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	<cpdanvzykcb5o64rmapkx6n5gjypoce3y52hff7ocxupgpbxu4@53jmlyvukijo>
	<CADkLM=dX67xer59tVYMCQZ+pHAT2sCyyrUDzeDCdW_TdxqwOgA@mail.gmail.com>
	<curtrasm6ylt7es2ukfuals2mh5an72yzxgvyel65mw3ere7qs@nw6m4ffpo4m3>

On Mon, 2025-02-24 at 15:53 -0500, Andres Freund wrote:
> I don't think that's necessarily true, hot pruning might help some,
> as afaict
> the restore happens in multiple transactions.

Yeah, I just dumped and reloaded the regression database with and
without stats, and saw no difference in the resulting size. So it's
probably more correct to say "churn" rather than "bloat".

Even running "psql -1", I see modest bloat substantially less than 2x.

So if we agree that we don't mind a bit of churn and we will never need
this (despite what ANALYZE does), then I'm OK removing it. Which makes
me wonder why ANALYZE does it with inplace updates?

Regards,
	Jeff Davis







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