Re: Can we Flush the Postgres Shared Memory ?

From: Simon Riggs <simon(at)2ndQuadrant(dot)com>
To: raghu ram <raghuchennuru(at)gmail(dot)com>
Cc: Raghavendra <raghavendra(dot)rao(at)enterprisedb(dot)com>, pgsql-admin <pgsql-admin(at)postgresql(dot)org>, pgsql-general <pgsql-general(at)postgresql(dot)org>, pgsql novice <pgsql-novice(at)postgresql(dot)org>
Subject: Re: Can we Flush the Postgres Shared Memory ?
Date: 2011-05-03 13:54:30
Message-ID: BANLkTim6ucpFuytq=kf2ignxFUeUK2N=1Q@mail.gmail.com
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On Tue, May 3, 2011 at 2:30 PM, raghu ram <raghuchennuru(at)gmail(dot)com> wrote:

>>> The CHECKPOINT command will do this for you.
>>
>>
>
> According to PostgreSQL documentation, whenever you execute "CHECKPOINT" in
> the database,it will flush the modified data files presented in the Shared
> Buffers retuned to the Disk.
>            http://www.postgresql.org/docs/9.0/static/sql-checkpoint.html
> Is this clears the entire shared memory cache and same time,if i execute
> fresh SQL statement, Data will be retuned from disk??

No, but then you'd need to flush OS buffers and all disk caches as
well to make that effective.

--
 Simon Riggs                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services

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