public inbox for [email protected]  

help / color / mirror / Atom feed

From: Alvaro Herrera <[email protected]>
To: johannes graën <[email protected]>
Cc: Pavel Stehule <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: performance drop after upgrade (9.6 > 10)
Date: Tue, 24 Oct 2017 18:17:15 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <CA++JNSfTEifSiBq73zpGCQuDNGr9yYcjmkx_=LtAbnadKLY_vg@mail.gmail.com>
List-Unsubscribe:  <mailto:[email protected]?body=unsub%20pgsql-performance>

johannes graën wrote:
> Hi Pavel, *,
> 
> you were right with ANALYZing the DB first. However, even after doing
> so, I frequently see Seq Scans where an index was used before. This
> usually cooccurs with parallelization and looked different before
> upgrading to 10. I can provide an example for 10 [1], but I cannot
> generate a query plan for 9.6 anymore.

https://wiki.postgresql.org/wiki/Slow_Query_Questions

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services


-- 
Sent via pgsql-performance mailing list ([email protected])
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-performance

reply

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: [email protected]
  Cc: [email protected], [email protected], [email protected]
  Subject: Re: performance drop after upgrade (9.6 > 10)
  In-Reply-To: <[email protected]>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox