too many clog files

From: Duan Ligong <duanlg(at)nec-as(dot)nec(dot)com(dot)cn>
To: pgsql-performance(at)postgresql(dot)org
Subject: too many clog files
Date: 2008-09-01 11:22:48
Message-ID: 20080901191255.E398.DUANLG@nec-as.nec.com.cn
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Hi, there.

I have encountered an issue that there are too many
clog file under the .../pg_clog/ directory. Some of them
were even produced one month ago.

My questions:
- Does Vacuum delete the old clog files?
- Can we controll the maximum number of the clog files?
- When, or in what case is a new clog file produced?
- Is there a mechanism that the clog files are recycled?

#The version of my postgresql is 8.1

Regards
Duan

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