2010/8/11 Hans-Jürgen Schönig :
> now, the problem is: i cannot easily create additional indexes as i have too
> many possible "second" conditions here.
>
Is it just me or is this description of the problem not very specific?
Can you give more examples of your queries and explain what kind of
pla
2010/8/12 PostgreSQL - Hans-Jürgen Schönig :
> as tom pointed out - this is not possible.
> there is no limit 20 in my case - i just used it to indicate that limiting
> does not make the index scan possible which it does in some other cases.
I came up with this:
explain analyze select * from (se
as tom pointed out - this is not possible.
there is no limit 20 in my case - i just used it to indicate that limiting does
not make the index scan possible which it does in some other cases.
the partial sort thing simon pointed out is what is needed at this point.
many thanks,
Alvaro Herrera writes:
> Excerpts from Hans-Jürgen Schönig's message of mié ago 11 08:21:10 -0400
> 2010:
>> test=# explain analyze select * from t_test order by x, y limit 20;
> But if you put the limit in a subquery which is ordered by the
> known-indexed condition, it is very fast:
> alvh
Excerpts from Hans-Jürgen Schönig's message of mié ago 11 08:21:10 -0400 2010:
> same with limit ...
>
>
> test=# explain analyze select * from t_test order by x, y limit 20;
But if you put the limit in a subquery which is ordered by the
known-indexed condition, it is very fast:
alvherre=# exp
On Wed, 2010-08-11 at 14:21 +0200, Hans-Jürgen Schönig wrote:
> my question is: is there already a concept out there to make this work
> or does anybody know of a patch out there addressing an issue like
> that?
> some idea is heavily appreciated. it seems our sort key infrastructure
> is not enoug
hello all ...
i am bugged with a small issue which is basically like this ...
test=# create table t_test as select x, x % 5 as y from generate_series(1,
100) AS x;
SELECT
test=# create index idx_a on t_test (x) ;
CREATE INDEX
test=# ANALYZE ;
ANALYZE
test=# explain analyze select * from
