Re: index being ignored for "limit n" queries

Ave!

Tom Lane wrote:
>>trax=# explain select * from pakiety where stid = 234::smallint order by
>>received desc limit 1;
>
> The reason this won't use the (stid, received) index is that the
> requested sort order doesn't match that index.  Try
>
> select * from pakiety where stid = 234::smallint
> order by stid desc, received desc
> limit 1;

Thanks. It works. And the speedup was from 2 minutes 32.13 seconds to
0.69 seconds (in a worst case for the previous scenario).

Thanks again for your help.

Piotr Sulecki.