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what the initial 3 daemon of postmaster process do?

From: 김도형 <dh2002(dot)kim(at)samsung(dot)com>
To: pgsql-admin(at)postgresql(dot)org
Subject: what the initial 3 daemon of postmaster process do?
Date: 2004-03-17 12:34:48
Message-ID: 003201c40c1c$3d5932d0$a076d5a5@dhkim (view raw, whole thread or download thread mbox)
Lists: pgsql-admin
Hi All,

After fist installation, using pg_ctl script, I started postmaster process.

after 'ps -ef|grep postmaster', there are 3 daemon process in its initial state.

I like to get information about the reason belows.
1. why 3 daemon processes start in the starting point
2. what the role of each 3 daemon processes is
3. and how can I control the initial daemon process count.

I like to also confirm whether the count of postmaster process that is up in the run time 
increases or decreases according to the client-request, that is, the DB transaction.

regards, Dohyung Kim

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