Re: [PERFORM] why we do not create indexes on master

Valerii Valeev  wrote:

> Dear colleagues,
> 
> can anyone please explain, why we do not create indexes on master?
> In my case master / child design blindly follows partitioning guide https://
> www.postgresql.org/docs/9.6/static/ddl-partitioning.html.
> My collaborator was unhappy with performance of queries over master table with
> filtering by one of fields
> 
> SELECT * FROM “master" WHERE “field" BETWEEN x AND y
> 
> (there are indexes for “field” on child tables).
> He has created index on master once and found that the query returns 100x
> faster.

please show us explain analyse with/without index on master.



Regards, Andreas Kretschmer
-- 
Andreas Kretschmer
http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services