Hi Alex,
sorry, I missed your response somehow, got it only with today’s digest.
Thanks for the hint. I have basic idea how to investigate query perf issues.
I thought maybe I miss some understanding of the grounds.
It’ll take some time to get enough test data and I’ll try to take a look myself and come back after that.
Regards,
Val.
From: Andreas Kretschmer <akretschmer@spamfence.net>Subject: Re: why we do not create indexes on master
Date: Dec 27 2016 19:04:27 GMT+3
Valerii Valeev <valerii.valeev@mail.ru> 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 Kretschmerhttp://www.2ndQuadrant.com/PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
