meaning of explain

From: Auri Mason <amason(at)syntrex(dot)com>
To: pgsql-admin(at)postgresql(dot)org
Subject: meaning of explain
Date: 2002-07-09 10:19:41
Message-ID: Pine.LNX.4.44.0207091216530.5906-100000@mendeleev.syntrex.com
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in order to measure the improve of performances after a vacuum+reindex (do
you suggest something more?), I want to understand exactly the output of
the explain command.
After a google search I found a broken link posted by Tom.

Anyone of you can help me?

TIA, Auri

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