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From: Tom Lane <[email protected]>
To: Aleksander Alekseev <[email protected]>
Cc: Frits Hoogland <[email protected]>
Cc: [email protected]
Subject: Re: The ability of postgres to determine loss of files of the main fork
Date: Tue, 30 Sep 2025 12:41:29 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAJ7c6TMYvYBQpgv8k+4QnajqPcroOzrj7d3snBBTKX4tHQfVYw@mail.gmail.com>
References: <[email protected]>
	<CAJ7c6TMYvYBQpgv8k+4QnajqPcroOzrj7d3snBBTKX4tHQfVYw@mail.gmail.com>

Aleksander Alekseev <[email protected]> writes:
>> Therefore, I would like to request an enhancement: add an option to
>> verify_heapam() that causes the primary key index to be scanned and makes
>> sure that all line pointers in the index point to existing tuples.

> ... IMO there is little value in adding a check for the existence of
> the segments for a single table. And the *real* check will not differ
> much from something like SELECT * FROM my_table, or from making a
> complete backup of the database.

As Frits mentioned, neither of those actions will really notice if a
table has been truncated via loss of a segment.

However, I think the requested functionality already exists via
contrib/amcheck (see the heapallindexed option).  The user does have
to make a decision which index to check with, but I think that'd be
required anyway --- as you say, there isn't necessarily a primary key.

			regards, tom lane

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