| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
| Cc: | Martin Marques <martin(at)bugs(dot)unl(dot)edu(dot)ar>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Bitmap Heap scan 8.1/8.2 |
| Date: | 2007-10-23 14:22:12 |
| Message-ID: | 10734.1193149332@sss.pgh.pa.us |
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| Thread: | |
| Lists: | pgsql-general |
Alvaro Herrera <alvherre(at)commandprompt(dot)com> writes:
> Martin Marques escribi:
>>> seq_page_cost = 5.0 # measured on an arbitrary scale
> What people generally do around here is mess with random_page_cost, and
> leave seq_page_cost alone.
It's also worth pointing out that having seq_page_cost >
random_page_cost is simply not sane, and is very likely to result in
performance problems in other queries.
regards, tom lane
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