What is this thing that is called a "Data Dictionary?"

From: Richard Broersma Jr <rabroersma(at)yahoo(dot)com>
To: Novice Postgresql-list <pgsql-novice(at)postgresql(dot)org>
Subject: What is this thing that is called a "Data Dictionary?"
Date: 2007-05-02 19:21:12
Message-ID: 512654.56284.qm@web31815.mail.mud.yahoo.com
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Many of the ERD and SQL books that have have read refer to a data dictionary. However, I seem to
be missing the point of what it acuatally is. IIRC, some books refer to it as a kind of document
created by a DB designer, and other suggest that it is a kind of RBDMS created metadata.

Can anyone please offer a consise description or provide a link to that describes what it is?
Also, how is this information useful to a DBA?

Thanks for the help!

Regards,
Richard Broersma Jr.

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