Hi Heikki Linnakangas,

Thanks for yoru kind response.

We were looking on how to improve the performance of our
application which is using PostgreSQL as backend. If postgreSQL is
supporting data page caching in the shared memory then we wanted to
design our application to read/write using the shared memory rather than
accessing the DB everytime so that, it will improve the performance of
our system.

If this is possible can you please tell us how can we implement
the same. Any idea on the same is of very much help.

Thanks in Advance,
Ramachandra B.S.

-----Original Message-----
From: Heikki Linnakangas [mailto:hlinnaka@gmail.com] On Behalf Of Heikki
Linnakangas
Sent: Tuesday, January 16, 2007 3:04 PM
To: Ramachandra Bhaskaram (WT01 - IP-Multimedia Carrier & Ent Networks)
Cc: pgsql-performance@postgresql.org
Subject: Re: [PERFORM] Caching in PostgreSQL

ramachandra.bhaskaram@wipro.com wrote:
>
> Hi,
>
> Can anybody tell me how can I implement data Caching in the
shared
> memory using PostgreSQL.

PostgreSQL, like most other DBMS, caches data pages in shared memory.
What exactly are you trying to accomplish? Are you having a performance
problem?

--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com


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ramachandra.bhaskaram@wipro.com wrote:
> We were looking on how to improve the performance of our
> application which is using PostgreSQL as backend. If postgreSQL is
> supporting data page caching in the shared memory then we wanted to
> design our application to read/write using the shared memory rather than
> accessing the DB everytime so that, it will improve the performance of
> our system.

That's a bad idea. Just design your database schema with performance in
mind, and use PostgreSQL normally with SQL queries. If you must, use a
general-purpose caching library in your application, instead of trying
to peek into PostgreSQL internals.

--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com

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http://archives.postgresql.org

I am using memcached (http://www.danga.com/memcached/) to cache Postgres
ADODB recordsets.
It's very efficient but has to be implemented in your own application.


On 1/16/07, Heikki Linnakangas <heikki@enterprisedb.com> wrote:
>
> ramachandra.bhaskaram@wipro.com wrote:
> > We were looking on how to improve the performance of our
> > application which is using PostgreSQL as backend. If postgreSQL is
> > supporting data page caching in the shared memory then we wanted to
> > design our application to read/write using the shared memory rather than
> > accessing the DB everytime so that, it will improve the performance of
> > our system.
>
> That's a bad idea. Just design your database schema with performance in
> mind, and use PostgreSQL normally with SQL queries. If you must, use a
> general-purpose caching library in your application, instead of trying
> to peek into PostgreSQL internals.
>
> --
> Heikki Linnakangas
> EnterpriseDB http://www.enterprisedb.com
>
> ---------------------------(end of broadcast)---------------------------
> TIP 4: Have you searched our list archives?
>
> http://archives.postgresql.org
>



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