Re: Why doesn't GiST VACUUM require a super-exclusive lock, like nbtree VACUUM?

> 4 нояб. 2021 г., в 20:58, Peter Geoghegan <pg@bowt.ie> написал(а):
> That's a pretty unlikely scenario. And even
> if it happened it would only happen once (until the next time we get
> unlucky). What are the chances of somebody noticing a more or less
> once-off, slightly wrong answer?

I'd say next to impossible, yet not impossible. Or, perhaps, I do not see protection from this.

Moreover there's a "microvacuum". It kills tuples with BUFFER_LOCK_SHARE. AFAIU it should take cleanup lock on buffer too?

Best regards, Andrey Borodin.