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help / color / mirror / Atom feedFrom: David G. Johnston <[email protected]>
To: Ron Johnson <[email protected]>
Cc: pgsql-general <[email protected]>
Subject: Re: CLUSTER vs. VACUUM FULL
Date: Mon, 22 Apr 2024 09:29:21 -0700
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On Mon, Apr 22, 2024, 08:37 Ron Johnson <[email protected]> wrote:
> On Mon, Apr 22, 2024 at 10:25 AM Tom Lane <[email protected]> wrote:
>
>> Marcos Pegoraro <[email protected]> writes:
>> > But wouldn't it be good that VACUUM FULL uses that index defined by
>> > Cluster, if it exists ?
>>
>> No ... what would be the difference then?
>>
>
> What the VACUUM docs "should" do, it seems, is suggest CLUSTER on the PK,
> if the PK is a sequence (whether that be an actual sequence, or a timestamp
> or something else that grows monotonically).
>
> That's because the data is already roughly in PK order.
>
If things are bad enough to require a vacuum full that doesn't seem like a
good assumption. Any insert-only table or one with a reduced fill-factor
maybe.
David J
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Subject: Re: CLUSTER vs. VACUUM FULL
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