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From: Tom Lane <[email protected]>
To: Michel SALAIS <[email protected]>
Cc: [email protected]
Subject: Re: "clearing" a relation file !
Date: Sat, 14 May 2022 16:46:14 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

"Michel SALAIS" <[email protected]> writes:
> \! dd if=/dev/zero of=$file_path bs=1024 count=100

This is fairly useless.

As you already noticed, it corrupts the on-disk data but has no
immediate effect on what's in shared buffers.  Depending on what
the timing of checkpoints is, the damage might even be self-healed
due to writing out shared buffers after you corrupt the storage.

The other problem with this specific test is that an all-zero
page is considered to be a valid state.  You may consider that
a problem or not, but we're quite unlikely to change it, because
doing so would create false failure reports.  See the mechanisms
around file extension.

			regards, tom lane

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