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Re: Extremely slow intarray index creation and inserts.

From: Oleg Bartunov <oleg(at)sai(dot)msu(dot)su>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Ron Mayer <rm_pg(at)cheapcomplexdevices(dot)com>, Teodor Sigaev <teodor(at)sigaev(dot)ru>, pgsql-performance(at)postgresql(dot)org
Subject: Re: Extremely slow intarray index creation and inserts.
Date: 2009-03-19 12:45:28
Message-ID: Pine.LNX.4.64.0903191544500.31919@sn.sai.msu.ru (view raw or flat)
Thread:
Lists: pgsql-performance
On Thu, 19 Mar 2009, Oleg Bartunov wrote:

> On Thu, 19 Mar 2009, Tom Lane wrote:
>
>> Oleg Bartunov <oleg(at)sai(dot)msu(dot)su> writes:
>>> We usually say about 200 unique values as a limit for
>>> gist_int_ops.
>> 
>> That seems awfully small ... should we make gist_intbig_ops the default,
>> or more likely, raise the signature size of both opclasses?  Even at a
>> crossover point of 10000 I'm not sure that many real-world apps would
>> bother considering gist_int_ops.
>
> gist__int_ops doesn't uses signatures, it uses range compression, which
> is not lossy, but not capacious. Perhaps, that's why we decided to use it as

sorry, it's lossy

> default opclass.
>
>
> 	Regards,
> 		Oleg
> _____________________________________________________________
> Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
> Sternberg Astronomical Institute, Moscow University, Russia
> Internet: oleg(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
> phone: +007(495)939-16-83, +007(495)939-23-83
>
>

 	Regards,
 		Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: oleg(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83

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Subject: Re: Extremely slow intarray index creation and inserts.

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