From: Kevin Grittner <kgrittn@mail.com>
To: AI Rumman <rummandba@gmail.com>
To: Claudio Freire <klaussfreire@gmail.com>
Cc: Evgeny Shishkin <itparanoia@gmail.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Andrew Dunstan <andrew@dunslane.net>
Cc: postgres performance list <pgsql-performance@postgresql.org>
Subject: Re: Why does the number of rows are different in actual and estimated.
Date: Fri, 14 Dec 2012 14:14:27 -0500
Message-ID: <20121214191427.80090@gmx.com> (raw)
List-Unsubscribe: <mailto:majordomo@postgresql.org?body=unsub%20pgsql-performance>
AI Rumman wrote:
> Claudio Freire <klaussfreire@gmail.com>wrote:
>> I think it's more likely a missing FK constraint.
> Does FK Constraint help to improve performance? Or it is only
> for maintaining data integrity?
I'm not aware of any situation where adding a foreign key
constraint would improve performance.
-Kevin
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Subject: Re: Why does the number of rows are different in actual and estimated.
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