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Re: Can we Flush the Postgres Shared Memory ?

From: raghu ram <raghuchennuru(at)gmail(dot)com>
To: Raghavendra <raghavendra(dot)rao(at)enterprisedb(dot)com>
Cc: Simon Riggs <simon(at)2ndquadrant(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 13:30:46
Message-ID: BANLkTinmZhDFg-PV5sztAYVLMm7Qm-+p7w@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-adminpgsql-generalpgsql-novice
On Tue, May 3, 2011 at 6:01 PM, Raghavendra <
raghavendra(dot)rao(at)enterprisedb(dot)com> wrote:

>
> On Tue, May 3, 2011 at 5:37 PM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
>
>> On Tue, May 3, 2011 at 11:54 AM, raghu ram <raghuchennuru(at)gmail(dot)com>
>> wrote:
>>
>> > It may be a silly question, still out of curiosity I want to know, is
>> there
>> > any possible way to flush the Postgres Shared Memory without restarting
>> the
>> > cluster.
>> > In Oracle, we can flush the SGA, can we get the same feature here..
>> > Thanks in Advance.
>>
>>
>> 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??



--Raghu Ram

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