Re: Multiple FPI_FOR_HINT for the same block during killing btreeindex items

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От Peter Geoghegan
Тема Re: Multiple FPI_FOR_HINT for the same block during killing btreeindex items
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Msg-id CAH2-Wzm2BPMD0JFVgUtpC-YGM6zjrwJJ6ixYOCSKr8QNoNuz3g@mail.gmail.com
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Ответ на Re: Multiple FPI_FOR_HINT for the same block during killing btreeindex items  (James Coleman <jtc331@gmail.com>)
Ответы Re: Multiple FPI_FOR_HINT for the same block during killing btreeindex items  (James Coleman <jtc331@gmail.com>)
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On Thu, Apr 9, 2020 at 6:47 PM James Coleman <jtc331@gmail.com> wrote:
> I believe the write pattern to this table likely looks like:
> - INSERT
> - UPDATE
> - DELETE
> for every row. But tomorrow I can do some more digging if needed.

The pg_stats.null_frac for the column/index might be interesting here. I
believe that Active Record will sometimes generate created_at columns
that sometimes end up containing NULL values. Not sure why.


--
Peter Geoghegan

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