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From: Christophe Pettus <[email protected]>
To: bruno vieira da silva <[email protected]>
Cc: [email protected]
Subject: Re: data checksums
Date: Tue, 6 Aug 2024 09:29:43 -0700
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAB+Nuk8y88kvoRHsfN2Pjed9o_iM+9FbveU=4P8G0EQbzFP+qw@mail.gmail.com>
References: <CAB+Nuk8y88kvoRHsfN2Pjed9o_iM+9FbveU=4P8G0EQbzFP+qw@mail.gmail.com>



> On Aug 6, 2024, at 08:11, bruno vieira da silva <[email protected]> wrote:
> 
> so my question is why data checksums aren't enabled by default on pg?

At this point, mostly historical reasons.  They're also superfluous if your underlying file system or storage hardware does storage-level corruption checks (which most don't).

> the pg doc 
> mentions a considerable performance penality, how considerable it is?

That line is probably somewhat out of date at this point.  We haven't seen a significant slowdown in enabling them on any modern hardware.  I always turn them on, except on the type of filesystems/hardware mentioned above.

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