| From: | Kevin Grittner <kgrittn(at)ymail(dot)com> |
|---|---|
| To: | Jayadevan M <maymala(dot)jayadevan(at)gmail(dot)com>, "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Theory question |
| Date: | 2013-11-12 18:24:48 |
| Message-ID: | 1384280688.49523.YahooMailNeo@web162903.mail.bf1.yahoo.com |
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| Lists: | pgsql-general |
Jayadevan M <maymala(dot)jayadevan(at)gmail(dot)com> wrote:
> What are the real differences between the bgwriter and
> checkpointer process? Both of them write data from the buffer to
> the data files, right? Is it just a matter of 'when' they write?
The checkpointer process is responsible for creating safe points
from which a recovery can begin; the background writer tries to
keep some pages available for re-use so that processes running
queries don't need to wait for page writes in order to have free
spots to use in shared buffers.
--
Kevin Grittner
EDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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