Re: [GENERAL] GEQO and KSQO problem.

First off, what version of PostgreSQL?

Second...what does 'explain' show for this query...

On Thu, 2 Sep 1999, Natalya S. Makushina wrote:

> Hello all!
>
> When i had posted the SQL query like this
>
> "select distinct CLIENTS.CLIENTID,PRINADLEG.PRIM,CLIENTS.NAME_1,CLIENTS.NAME_2,CLIENTS.STRANA,CLIENTS.REGION,
CLIENTS.INDEKC,
> CLIENTS.GOROD,CLIENTS.OBLAST,CLIENTS.ULICA_DOM,CLIENTS.A_YA,CLIENTS.FLG_ADR,CLIENTS.TYP_CLS,
CLIENTS.SITE,CLIENTS.OTRASL,
> CLIENTS.VID_D,CLIENTS.KATEGOR,CLIENTS.METKI,CLIENTS.MANAGER,CLIENTS.MANAGER_ID,
CLIENTS.PRIM,CLIENTS.ARH,CLIENTS.NEW_F,
> CLIENTS.WRITER,CLIENTS.FLG_MY
> from CLIENTS ,PRINADLEG ,SOTRUD
> where CLIENTS.CLIENTID=SOTRUD.CLIENTID and
> ( CLIENTS.PRINADL=PRINADLEG.PRINADL and CLIENTS.FLG_MY and (NOT CLIENTS.ARH) and lower(SOTRUD.EMAIL) LIKE
lower('%ruslanmr@hotmail.com%')
>   OR CLIENTS.PRINADL=PRINADLEG.PRINADL and CLIENTS.FLG_MY and (not CLIENTS.ARH) and lower(SOTRUD.EMAIL) LIKE
lower('%matukin@hotmail.com%') 
>   OR CLIENTS.PRINADL=PRINADLEG.PRINADL and CLIENTS.FLG_MY and (not CLIENTS.ARH) and lower(SOTRUD.EMAIL) LIKE
lower('%knirti@kaluga.ru%') 
>   OR CLIENTS.PRINADL=PRINADLEG.PRINADL and CLIENTS.FLG_MY and (not CLIENTS.ARH) and lower(SOTRUD.EMAIL) LIKE
lower('%avk@vniicom.vsu.ru%')
>   OR CLIENTS.PRINADL=PRINADLEG.PRINADL and CLIENTS.FLG_MY and (not CLIENTS.ARH) and lower(SOTRUD.EMAIL) LIKE
lower('%avk@vniicom.vsu.ru%')
> )
> order by CLIENTS.NEW_F, CLIENTS.NAME_1"
>
> my server worked very, very slow. When i  had tried shutdown it's borrowed 1 hour aproximately.
>
> In postgres log file i saw message:
> FATAL 1: palloc memory memory exhausted
>
> I have found in the postgres mailing lists that it was a GEQO problem.
> I tried to turn on the KSQO, but there was no any effect.
> In documentaion there is a phrase like this
>     "Memory exhaustion may occur with more than 10 relation involved in a query."
> But i have only 3 relation involved in query.
>
> What is a solution of the this problem?
>
> Thanks for help
>
>                 Natalya Makushina
>                 mak@rtsoft.msk.ru
>
>
>
>
>
>
> ************
>

Marc G. Fournier                   ICQ#7615664               IRC Nick: Scrappy
Systems Administrator @ hub.org
primary: scrappy@hub.org           secondary: scrappy@{freebsd|postgresql}.org