Обсуждение: Bug: the index on INTEGER field does not work (PG 7.1.2)

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.

Alexandr S. writes:

> 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).

2.5) vacuum analyze

> 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

--
Peter Eisentraut   peter_e@gmx.net   http://funkturm.homeip.net/~peter