Re: new heapcheck contrib module

[ retrying from the email address I intended to use ]

On Mon, Apr 20, 2020 at 3:42 PM Andres Freund <andres@anarazel.de> wrote:
> I don't think random interspersed uses of CLogTruncationLock are a good
> idea. If you move to only checking visibility after tuple fits into
> [relfrozenxid, nextXid), then you don't need to take any locks here, as
> long as a lock against vacuum is taken (which I think this should do
> anyway).

I think it would be *really* good to avoid ShareUpdateExclusiveLock
here. Running with only AccessShareLock would be a big advantage. I
agree that any use of CLogTruncationLock should not be "random", but I
don't see why the same method we use to make txid_status() safe to
expose to SQL shouldn't also be used here.

-- 
Robert Haas
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