Re: Poor Performance on Postgres 8.0

explain analyze select * from common.string text1_
where text1_.value='squareFeet';

                                               QUERY PLAN
--------------------------------------------------------------------------------------------------------
 Seq Scan on string text1_  (cost=0.00..4.41 rows=1 width=21) (actual
time=0.283..0.322 rows=1 loops=1)
   Filter: (value = 'squareFeet'::text)
 Total runtime: 0.492 ms


I am not worried about this table as common.string has only 190 records,
where as the other table common.attribute which is very big (200k
records) i want it to use index scan on it . The matching column in
common.attribute table has only 175 distinct records in common.attribute
table , do you think that's the problem ? here is the full query again

select attribute0_.attributeid as attribut1_, attribute0_.stringvalue as
stringva2_,
    attribute0_.bigStringvalue as bigStrin3_, attribute0_.integervalue
as integerv4_,
    attribute0_.numericvalue as numericv5_, attribute0_.datevalue as
datevalue,
    attribute0_.booleanvalue as booleanv7_, attribute0_.fknamestringid
as fknamest8_
from  common.attribute attribute0_, common.string text1_
where     (text1_.value='squareFeet' and
attribute0_.fknamestringid=text1_.stringid)
and     (numericValue='775.0')


Tom Lane wrote:

>Pallav Kalva <pkalva@deg.cc> writes:
>
>
>>still doesnt make use of the index on common.attribute table .
>>
>>
>
>What do you get from just plain
>
>explain analyze select * from common.string text1_
>where text1_.value='squareFeet';
>
>I get the impression that it must think this will yield a lot of rows.
>
>            regards, tom lane
>
>
>