On March 22, 2017 3:54:07 PM GMT+01:00, Tom Lane <t...@sss.pgh.pa.us> wrote:
>Andres Freund <and...@anarazel.de> writes:
>> On 2017-03-22 10:14:14 -0400, Tom Lane wrote:
>>> (2) How you gonna update this in vacuum?  It cannot do a
>>> update.
>> I think we can just do that in a separate transaction, at the tail
>> of vacuum_rel() - if we crash just before that, not that much is
>Blech.  What if someone's queued an exclusive lock request on the

Point - could do that with a session lock if needed.

>Actually though, maybe you could get away with updating the last-vacuum
>field nontransactionally.  I think we're already updating some of the
>other pg_class fields nontransactionally.

We do, reltuples/pages, relfrozenxid and such. That should work too, the whole 
inplace business ain't pretty, but one more column won't make it much worse.


Sent from my Android device with K-9 Mail. Please excuse my brevity.

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