what are clog and xlog?

From: flyusa2010 fly <flyusa2010(at)gmail(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Subject: what are clog and xlog?
Date: 2010-12-05 06:33:32
Message-ID: AANLkTi=BNZWj64+Ba0CCOBBm9fPRp3YY5J_bW3AoDzNK@mail.gmail.com
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Hi, folks,

I'm a newbie to postgres. I'm confused with xlog and clog.
To my initial understanding, xlog is the periodic checkpoint log for data,
while clog is for commit log (very unclear for me ...)

Thanks!

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