Re: The ability of postgres to determine loss of files of the main fork

Aleksander Alekseev <aleksander@tigerdata.com> 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