From: Rich Doughty <rich@opusvl.com>
To: KeithW@NarrowPathInc.com
Cc: PostgreSQL Perform <pgsql-performance@postgresql.org>
Subject: Re: view of view
Date: Thu, 08 Dec 2005 13:46:45 +0000
Message-ID: <43983945.9020706@opusvl.com> (raw)
In-Reply-To: <43979EC0.1060400@NarrowPathInc.com>
References: <43979EC0.1060400@NarrowPathInc.com>
Keith Worthington wrote:
> Hi All,
>
> I am working on an application that uses PostgreSQL. One of the
> functions of the application is to generate reports. In order to keep
> the code in the application simple we create a view of the required data
> in the database and then simply execute a SELECT * FROM
> view_of_the_data; All of the manipulation and most of the time even the
> ordering is handled in the view.
>
> My question is how much if any performance degradation is there in
> creating a view of a view?
>
> IOW if I have a view that ties together a couple of tables and
> manipulates some data what will perform better; a view that filters,
> manipulates, and orders the data from the first view or a view that
> performs all the necessary calculations on the original tables?
from personal experience, if the inner views contain outer joins performance
isn't that great.
--
- Rich Doughty
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To: pgsql-performance@postgresql.org
Cc: rich@opusvl.com, KeithW@NarrowPathInc.com
Subject: Re: view of view
In-Reply-To: <43983945.9020706@opusvl.com>
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