Re: optimizing Postgres queries

Hi Shridhar,

> Are you sure you are using correct data types on indexes?
>
Did not know about this...

> e.g. if field1 is an int2 field, then following query would not use an
> index.
>
our fk have the type bigint, when i try one simple select like this:

explain analyze SELECT --columns-- FROM KEY_VALUE_META_DATA t0 WHERE
t0.ID_FOREIGN_TABLE = 21110;

i see that no index is being used whereas when i use

explain analyze SELECT --columns-- FROM KEY_VALUE_META_DATA t0 WHERE
t0.ID_FOREIGN_TABLE = 21110::bigint;

an index is used. Very fine, the performance is about 10 to 100 times
faster for the single select.

I am using WebObjects with JDBC. I will now create a DB with integer
instead of bigint and see how this performs.

regards David