From: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | Peter Andrews <pete(at)piedmontdata(dot)com> |
Cc: | pgsql-sql(at)postgresql(dot)org |
Subject: | Re: [SQL] runaway backend process |
Date: | 1999-09-10 13:31:00 |
Message-ID: | 199909101331.JAA24906@candle.pha.pa.us |
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Lists: | pgsql-sql |
> Any help with this problem would be greatly appreciated. After
> executing the following query, the postgres backend server process that
> is executing the query grows in size until it consumes well over 200 MB
> and takes several minutes to finish:
>
> select mlno from table where
> (area='01' and sub_area='01') or
> (area='01' and sub_area='02') or
> (area='01' and sub_area='03') or
> (area='01' and sub_area='04') or
> (area='07' and sub_area='01') or
> (area='07' and sub_area='02') or
> (area='07' and sub_area='03') or
> (area='08' and sub_area='01') or
> (area='08' and sub_area='03') or
> (area='09' and sub_area='01') or
> (area='09' and sub_area='02') or
> (area='04') or
> (area='05') or
> (area='06') or
> (area='99');
We have problems processing a large number of OR's. 6.6 will be better
in this area.
--
Bruce Momjian | http://www.op.net/~candle
maillist(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
+ Christ can be your backup. | Drexel Hill, Pennsylvania 19026
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