Date: Wed, 12 Dec 2018 15:05:45 -0800
From: Andres Freund <andres@anarazel.de>
To: Ravi Krishna <srkrishna@fastmail.com>
Cc: pgsql-general@lists.postgresql.org
Subject: Re: explain analyze cost
Message-ID: <20181212230545.xg22ufkuqnv4hsbz@alap3.anarazel.de>
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On 2018-12-12 17:37:47 -0500, Ravi Krishna wrote:
> I am running explain analyze cost on a SQL which reads from two large
> tables (122mil and 37 mil).  The query is an UPDATE SQL where we use
> derives table in the from clause and then join it back to the table
> being updated.
> The explain analyze cost itself is taking forever to run. It is running
> for the last 1 hr. Does that actually run the SQL to find out the
> impact of I/O (as indicated in COSTS). If not, what can cause it to run
> this slow.__

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Thanks,

Andres