"Edmundo Robles L." <erobles@sensacd.com.mx> writes:
> I have two index with a same field into them like this:
> create index numberfail on Events (numberfail);
> and
> create index failtype on Events (numberfail,eventtype);
> then i ran explain analyze and always took the numberfail index but
i wish the failtype index;
Uh, why? If you have the smaller index available it's hard to imagine
any sane reason not to use it.
> I though maybe if i delete the index numberfail could works, but i don't know if the another program
> will fail if the numberfail index does'nt exists.
No, you can drop that one if you want to. You might care to read the
fine manual about index design:
http://www.postgresql.org/docs/8.3/static/indexes.html
regards, tom lane
