In general, I do not understand why a PK index should not be used when the query can be satisfied by the index itself. Can anyone give some reason to this?
On Mon, Feb 6, 2017, 6:29 PM Aron Podrigal <ar...@guaranteedplus.com> wrote: > EXPLAIN ANALYZE does not tell me much. It doesn't say why the planner opts > for not using the Primary key index. > > On Mon, Feb 6, 2017, 6:23 PM Alban Hertroys <haram...@gmail.com> wrote: > > > > On 7 Feb 2017, at 0:16, Podrigal, Aron <ar...@guaranteedplus.com> wrote: > > > > Hi, > > > > I noticed when I do a simple SELECT id FROM mytable WHERE id = > 'cb81d070-4213-465f-b32e-b8db43b83a25'::UUID Postgres does not use the > primary key index and opts for a Seq Scan. > > > > I of course did VACUUM ANALYZE and I have reset statistics But no sign. > Is there any particular thing I should be looking at? > > An EXPLAIN ANALYZE would be a good start. > > Alban Hertroys > -- > If you can't see the forest for the trees, > cut the trees and you'll find there is no forest. > >
