| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Qingqing Zhou" <zhouqq(at)cs(dot)toronto(dot)edu> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: qsort again (was Re: [PERFORM] Strange Create Index behaviour) |
| Date: | 2006-02-16 04:54:54 |
| Message-ID: | 23297.1140065694@sss.pgh.pa.us |
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| Lists: | pgsql-hackers pgsql-performance |
"Qingqing Zhou" <zhouqq(at)cs(dot)toronto(dot)edu> writes:
> "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote
>> No, I mean I ran the bit of SQL script I gave 100 separate times.
> I must misunderstand something here -- I can't figure out that why the cost
> of the same procedure keep climbing?
No, the run cost varies randomly depending on the random data supplied
by the test script. The reason the numbers are increasing is that I
sorted them for ease of inspection.
regards, tom lane
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