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From: Laurenz Albe <[email protected]>
To: Holger Jakobs <[email protected]>
To: [email protected]
Subject: Re: Does pg_dump custom format only compress the table data?
Date: Tue, 03 Feb 2026 13:47:49 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <CANzqJaAiTvMbuTUX86vZVCUY62KyHPffd_Dt1Po6Jmqv_9A_Bg@mail.gmail.com>
	<[email protected]>
	<[email protected]>

On Tue, 2026-02-03 at 08:51 +0100, Holger Jakobs wrote:
> Am 03.02.26 um 07:06 schrieb Laurenz Albe:
> > On Mon, 2026-02-02 at 10:55 -0500, Ron Johnson wrote:
> > > Out of curiosity, I opened that dump file in vim, and saw not only DDL strings but cleartext table data.
> > > 
> > > Why isn't it compressed?
> > Are your DDL statement large enough that you would expect that compressing
> > them would offer any real advantage?
> 
> That wasn't the question. It was about why table DATA aren't compressed, 
> but in clear text.

Ah, I see.

By default, you wouldn't see any table data, because they get compressed.

If a custom format dump is not compressed, the reason could be:

- PostgreSQL was built without support for compression (--without-zlib)

- pg_dump was called with --compress=0

Yours,
Laurenz Albe

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