From: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
---|---|
To: | "Decibel!" <decibel(at)decibel(dot)org> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Open issues for HOT patch |
Date: | 2007-09-19 03:41:18 |
Message-ID: | 46F09A5E.10908@commandprompt.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-hackers |
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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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