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From: Tom Lane <[email protected]>
To: Ron Johnson <[email protected]>
Cc: pgsql-general <[email protected]>
Subject: Re: CLUSTER vs. VACUUM FULL
Date: Sun, 21 Apr 2024 18:45:14 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <CANzqJaD8o0UuK42F==BXZA=L380n=aXt+VJ93PN3waFbNhZHBg@mail.gmail.com>
References: <CANzqJaD8o0UuK42F==BXZA=L380n=aXt+VJ93PN3waFbNhZHBg@mail.gmail.com>

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.

			regards, tom lane

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