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From: Andres Freund <andres@anarazel.de>
To: Ravi Krishna <srkrishna@fastmail.com>
Cc: pgsql-general@lists.postgresql.org
Subject: Re: explain analyze cost
Date: Wed, 12 Dec 2018 15:05:45 -0800
Message-ID: <20181212230545.xg22ufkuqnv4hsbz@alap3.anarazel.de> (raw)
In-Reply-To: <1544654267.3583234.1607577016.1555678D@webmail.messagingengine.com>
References: <HE1PR0402MB3625F9C2E5735459D63DA27C93A70@HE1PR0402MB3625.eurprd04.prod.outlook.com>
	<d5acdc15-fbba-0a85-95c1-082bb6d60e0b@portavita.eu>
	<CAN_ctnh4_f0SLNhm06NwutGHE5_Bx5hrn_0DskJJRW6kTEqnwQ@mail.gmail.com>
	<HE1PR0402MB3625FC1878598594295EC30993A70@HE1PR0402MB3625.eurprd04.prod.outlook.com>
	<CAN_ctnhpRDJmQaBVZM6008RkLYdCwtYx17ytx3yDeVkJoJ7o2w@mail.gmail.com>
	<1544654267.3583234.1607577016.1555678D@webmail.messagingengine.com>

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.__

Please do not hijack other threads by replying to a message and changing
the subject.  Just send a new mail to
pgsql-general@lists.postgresql.org, or whatever list you want to send an
email to.

Thanks,

Andres




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