Обсуждение: what are clog and xlog?

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what are clog and xlog?

От
flyusa2010 fly
Дата:
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!

Re: what are clog and xlog?

От
"Kevin Grittner"
Дата:
flyusa2010 fly  wrote:
> clog is for commit log (very unclear for me ...)
It is an important part of tracking tuple visibility.
You might want to start with this page:
http://wiki.postgresql.org/wiki/Hint_Bits
-Kevin