Re: Open issues for HOT patch

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Decibel! wrote:
> On Tue, Sep 18, 2007 at 09:31:03AM -0700, Joshua D. Drake wrote:

>>> If we do this, then it's not clear that having pgstats track dead space
>>> is worth the trouble at all. It might possibly be of value for testing
>>> purposes to see how well pruning is doing, but I'm unconvinced that it's
>>> worth bloating stats messages and files to have this number in a
>>> production system. An alternative that would serve as well for testing
>>> would be to teach contrib/pgstattuple to measure dead space.
>> As a DBA, I can say it doesn't really matter to me *how we track* the
>> dead space, as long as tracking it is:
>>
>> 1. Clear
>> 2. Simple
>> 3. Available by default (thus pgstattuple needs to push into core)
>
> 3 isn't that important to me, but 4 is:
>
> 4. Doesn't hammer the database to measure
>
> And pgstattuple fails #4 miserably. Want to know the average dead space
> in a 500GB database? Yeah, right....

Point taken, and agreed (although I still think it needs to be in core).

Joshua D. Drake

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