On Tue, 2005-08-02 at 10:04 -0700, Dr NoName wrote:
> I got another problem with postgres. This time it
> refuses to use the indexes. Check this out:
[snip]
> siam_production=> explain SELECT render.* FROM render
> WHERE person_id = 432;
> QUERY PLAN
> -----------------------------------------------------------------
> Seq Scan on render (cost=0.00..39014.72 rows=27833
> width=1493)
> Filter: (person_id = 432)
An explain analyze would be more informative, with and without
seqscan enabled.
What proportion of rows have this particular value of person_id?
Maybe you need to increase statistics target of the column.
What is the output of these:
set enable_seqscan = off;
explain SELECT render.* FROM render WHERE person_id = 432;
set enable_seqscan = on;
explain SELECT render.* FROM render WHERE person_id = 432;
select count(*) from render;
select count(*) from render WHERE person_id = 432;
gnari
