| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Alexander Korotkov <aekorotkov(at)gmail(dot)com> |
| Cc: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: GiST buffering build, bug in levelStep calculation |
| Date: | 2012-05-29 20:25:02 |
| Message-ID: | 19058.1338323102@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Alexander Korotkov <aekorotkov(at)gmail(dot)com> writes:
> On Tue, May 29, 2012 at 11:42 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> While I'm looking at this, is the first test involving
>> effective_cache_size bulletproof either? In particular, is
>> avgIndexTuplesPerPage clamped to be strictly greater than 1?
> It's based on collected statistics on already inserted tuple sizes. Since
> tuple sizes are measured after possible toasting, I don't see the way
> for avgIndexTuplesPerPage to be less than 1.
Yeah, but if it could be *equal* to one, you've got a zero-divide there.
regards, tom lane
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