Alvaro Herrera wrote:
> Tomas Vondra wrote:
> > FWIW I can reproduce this on 9.5, and I don't even need to run the
> > UPDATE part. That is, INSERT + VACUUM running concurrently is enough to
> > produce broken BRIN indexes :-(
> Hmm, I'm pretty sure we stress-tested brin in pretty much the same way.
> But I see this misbehavior too.  Looking ...

Turns out that this is related to concurrent growth of the table while
the summarization process is scanning -- so new pages have appeared at
the end of the table after the end point has been determined.  It would
be a pain to determine number of blocks for each range, so I'm looking
for a simple way to fix it without imposing so much overhead.

Álvaro Herrera      
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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