mat views stats

From: Jim Mlodgenski <jimmy76(at)gmail(dot)com>
To: PgHacker <pgsql-hackers(at)postgresql(dot)org>
Subject: mat views stats
Date: 2017-02-20 15:06:25
Message-ID: CAB_5SRchSz7-WmdO5szdiknG8Oj_GGqJytrk1KRd11yhcMs1KQ@mail.gmail.com
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I've come across a number of times where the statistics on materialized
views become stale producing bad plans. It turns out that autovacuum only
touches a materialized view when it is first created and ignores it on a
refresh. When you have a materialized view like yesterdays_sales the data
in the materialized view turns over every day.

Attached is a patch to trigger autovacuum based on a matview refresh along
with a system view pg_stat_all_matviews to show information more meaningful
for materialized views.

-- Jim

Attachment Content-Type Size
stat_matview.patch text/x-patch 20.8 KB

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