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what are clog and xlog? - Mailing list pgsql-hackers

From	flyusa2010 fly
Subject	what are clog and xlog?
Date	December 5, 2010 13:08:20
Msg-id	AANLkTi=BNZWj64+Ba0CCOBBm9fPRp3YY5J_bW3AoDzNK@mail.gmail.com Whole thread Raw
List	pgsql-hackers

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!

From: flyusa2010 fly
Date: 05 December 2010, 13:08:18
Subject: Re: disk caching for writing log

From: flyusa2010 fly
Date: 05 December 2010, 13:08:22
Subject: Using different semaphore for locking