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From: Marcos Pegoraro <[email protected]>
To: Álvaro Herrera <[email protected]>
Cc: David Klika <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Subject: Re: Adding REPACK [concurrently]
Date: Thu, 4 Dec 2025 14:47:56 -0300
Message-ID: <CAB-JLwbvqNnTmgZsE3T-KbAOO5w04uwdeYfSVtdumPfdSG6NJQ@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>

Em qui., 4 de dez. de 2025 às 12:43, Álvaro Herrera <[email protected]>
escreveu:

> If you only have a small number of pages that have this problem, then
> you don't actually need to do anything -- the pages will be marked free
> by regular vacuuming, and future inserts or updates can make use of
> those pages.  It's not a problem to have a small number of pages in
> empty state for some time.
>
> So if you're trying to do this, the number of problematic pages must be
> large.


Not necessarily. I have some tables where I like to use CLUSTER
every 2 or 3 months, to reorganize the data based on an index
and consequently load fewer pages with each call. These tables
don't have more than 2 or 3% of dead records, but they are quite
disorganized from the point of view of that index, since the
inserted and updated records don't follow the order I determined.


regards
Marcos

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