From: Vadim B. Mikheev <vadim@sable.krasnoyarsk.su>
To: Byron Nikolaidis <byronn@insightdist.com>
To: pgsql-interfaces@postgreSQL.org <pgsql-interfaces@postgreSQL.org>
To: Sbragion Denis <infotecn@tin.it>
To: pgsql-hackers@postgreSQL.org <pgsql-hackers@postgreSQL.org>
To: Olaf Mittelstaedt <mstaedt@va-sigi.va.fh-ulm.de>
To: Hannu Krosing <hannu@trust.ee>
Subject: Re: [INTERFACES] Re: [HACKERS] New Driver and Unique Indexes
Date: Tue, 28 Apr 1998 10:04:48 +0800
Message-ID: <35453940.45CB3AD6@sable.krasnoyarsk.su> (raw)
References: <3544D6E7.3211AAB4@insightdist.com>
<3545378B.C6263F16@sable.krasnoyarsk.su>
Sorry for koi-8 charset :)
Vadim B. Mikheev wrote:
>
> Byron Nikolaidis wrote:
> >
> > SELECT balance_id,company_id, balance_date, is_audited,comment,
> > balance_type, balance_filename FROM balance WHERE balance_id = 1 AND
> > company_id=1 OR balance_id = 1 AND company_id=2 OR balance_id = 1 AND
> > company_id=3 OR balance_id = 2 AND company_id=1 OR balance_id = 2 AND
> > company_id=2 OR balance_id = 2 AND company_id=3 OR balance_id = 3 AND
> > company_id=1 OR balance_id = 3 AND company_id=2 OR balance_id = 3 AND
> > company_id=3 OR balance_id = 4 AND company_id=1
> >
> > Any more than 2 keyparts, results in crashing the backend with the
> > message
> > "palloc failure: memory exhausted". Even at 2 keyparts, performance
> > suffers greatly.
>
> THis is known problem of canonificator in optimizer. This query will
> crash backend without any indices too.
> We told about this in the 6.3-beta period.
> No fix currently. I don't know when it will be at all.
>
> Vadim
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To: pgsql-interfaces@postgresql.org
Cc: vadim@sable.krasnoyarsk.su, byronn@insightdist.com, infotecn@tin.it, pgsql-hackers@postgreSQL.org, mstaedt@va-sigi.va.fh-ulm.de, hannu@trust.ee
Subject: Re: [INTERFACES] Re: [HACKERS] New Driver and Unique Indexes
In-Reply-To: <35453940.45CB3AD6@sable.krasnoyarsk.su>
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