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help / color / mirror / Atom feedFrom: Ron Johnson <[email protected]>
To: pgsql-general <[email protected]>
Subject: Re: CLUSTER vs. VACUUM FULL
Date: Sun, 21 Apr 2024 20:06:52 -0400
Message-ID: <CANzqJaAj9TRMKOwOv9pNjf7n5+e0bbd8ERZB2Zb8sdazVRmRwg@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <CANzqJaD8o0UuK42F==BXZA=L380n=aXt+VJ93PN3waFbNhZHBg@mail.gmail.com>
<[email protected]>
On Sun, Apr 21, 2024 at 6:45 PM Tom Lane <[email protected]> wrote:
> Ron Johnson <[email protected]> writes:
> > Why is VACUUM FULL recommended for compressing a table, when CLUSTER does
> > the same thing (similarly doubling disk space), and apparently runs just
> as
> > fast?
>
> CLUSTER makes the additional effort to sort the data per the ordering
> of the specified index. I'm surprised that's not noticeable in your
> test case.
>
It's in a freshly restored database. However, regular deletions of old
records, and normal vacuums would have led me to expect that the "fresh"
public.log would have been in relatively random order.
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Subject: Re: CLUSTER vs. VACUUM FULL
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