From: | Suvankar Roy <suvankar(dot)roy(at)tcs(dot)com> |
---|---|
To: | Chander Ganesan <chander(at)otg-nc(dot)com>, pgsql-admin(at)postgresql(dot)org |
Subject: | Re: Flush Shared Buffer Cache |
Date: | 2009-07-16 05:23:15 |
Message-ID: | OFF46F752A.C15FB624-ON652575F5.001C8D93-652575F5.001D484C@tcs.com |
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Thread: | |
Lists: | pgsql-admin |
Hi Chander,
Actually I am trying to figure out how much execution time any query is
taking is taking when executed for the first time.
Because once a query is executed for the first time, the query plan, data
buffer is cached so subsequently time taken is much lower.
For this, I want to have the Shared buffer cache flushed to note the
initial execution time.
Is my understanding correct here ?
Regards,
Suvankar Roy
Chander Ganesan <chander(at)otg-nc(dot)com>
07/15/2009 08:48 PM
To
Suvankar Roy <suvankar(dot)roy(at)tcs(dot)com>
cc
pgsql-admin(at)postgresql(dot)org
Subject
Re: [ADMIN] Flush Shared Buffer Cache
Suvankar Roy wrote:
>
> Hi,
>
> Can anyone help me out with how to flush out Shared Buffer Cache in
> Postgres.
>
> One way would be to restart the database, but I would like to avoid
that.
AFAIK, that's the only way.
Is there a reason that you need to dump the shared buffers? Perhaps if
we knew what you were trying to accomplish we could provide you with a
suitable solution that doesn't require a restart...
--
Chander Ganesan
Open Technology Group, Inc.
One Copley Parkway, Suite 210
Morrisville, NC 27560
919-463-0999/877-258-8987
http://www.otg-nc.com
Expert PostgreSQL, PostGIS, and other Open Source training delivered
worldwide.
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