Please see FAQ 4.9
http://postgresql.bteg.net/docs/faq-english.html#4.9
On Fri, 15 Jun 2001, Alexandr S. wrote:
>
> Bug: the index on INTEGER field does not work (PG 7.1.2).
>
> Test 1:
>
> 1) create table test_int(id int primary key);
>
> 2) insert 10000 records in table test_int with perl program (values
> 1,2,3,...,10000).
>
> 3) 500 times execute query
>
> SELECT * FROM test_int WHERE id = random number
>
> (random number puts with perl program)
>
> 4) 500 queries executes for 30 seconds
>
> Test 2:
>
> 1) create table test_int1(id int); (i.e. without primary key)
>
> 2) insert 10000 records in table test_int1 with perl program (values
> 1,2,3,...,10000).
>
> 3) 500 times execute query
>
> SELECT * FROM test_int1 WHERE id = random number
>
> (random number puts with perl program)
>
> 4) 500 queries executes for 30 seconds too :~-( ...
>
>
> P.S. For TEXT field the same operations executes for 30 and 1 seconds
> correspondingly.
>
>
>
>
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