Re: [HACKERS] after 9.2.4 patch vacuumdb -avz not analyzing all tables

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Jeff Janes <jeff.janes@xxxxxxxxx> writes:
> I believe the rationale was so that an autovacuum would still look like it
> was needed, and get fired again the next naptime, so that it could continue
> with the truncation attempts.  (Rather than waiting for 20% turnover in the
> table before trying again).  I'm not convinced by this argument.  If the
> DBA is desperate to get the space back, they can go do vacuum full.

Well, that's why I think the lock abandonment shouldn't apply to manual
plain vacuum.  You shouldn't need to do a vacuum full for that; that'd
be a huge increase in the cost, not to mention that it'd transiently
require twice the disk space, hardly a good thing if you're short.

			regards, tom lane


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