Index size

From: Samuel Williams <space(dot)ship(dot)traveller(at)gmail(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: Index size
Date: 2016-11-29 23:30:53
Message-ID: CAHkN8V8gLCfwdobKWxFfMmFaFBSzbryPzBVvnvjXvg-kBsS1yQ@mail.gmail.com
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I'd like to understand a bit more about indexes in PG.

When I have a row in a table, and an index, say, for a single column,
does that duplicate the entire row on disk? Or is there some kind of
id lookup involved?

Thanks.

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