RE: Large PGA for a data warehouse on Windows 2003 advanced server(32 bit)

I don't believe it's true that the /3gb switch can't be used, just that it will limit you to 16GB only even if you have > 16gb. From Metalink Note:225349.1

Enabling support at the OS level:

    AWE can be enabled at the OS by adding the /PAE switch to the boot.ini     as such:

multi(0)disk(0)rdisk(0)partition(1)\WINNT="Microsoft Windows 2000 Advanced Server" /PAE

    It IS possible to have BOTH the /PAE and /3GB switch in place on the same     machine, as such:

multi(0)disk(0)rdisk(0)partition(1)\WINNT="Microsoft Windows 2000 Advanced Server" /3GB /PAE

    However, be aware that if BOTH switches are in place, the server will only     be able to recognize up to 16GB of RAM. If you are working with a server     with more than 16GB of RAM, you will need to choose between the two.

-----Original Message-----

From: Ken Naim [mailto:kennaim_at_gmail.com] Sent: Thursday, July 28, 2005 9:40 AM
To: Allen, Brandon; oracle-l_at_freelists.org Subject: RE: Large PGA for a data warehouse on Windows 2003 advanced server(32 bit)

Brandon,

I have read that the /3gb switch cannot be used once the server has greater than 16gb of ram. I have already set the /pae switch and am using USE_INDIRECT_DATA_BUFFERS=true and currently have 6gb allocated to db_block_buffers with good results so far. I have not opened a tar yet as I was hoping someone already encountered this issue and had a solution.

Thanks,
Ken

-----Original Message-----

From: Allen, Brandon [mailto:Brandon.Allen_at_OneNeck.com] Sent: Thursday, July 28, 2005 11:27 AM
To: kennaim_at_gmail.com; oracle-l_at_freelists.org Subject: RE: Large PGA for a data warehouse on Windows 2003 advanced server(32 bit)

Ken,

See Metalink Note 1036312.6 for info on how to use up to 3GB (set /3GB switch in your boot.ini) or see note 46001.1 for info on how to use more than 3GB (for buffer cache only - you have to set USE_INDIRECT_DATA_BUFFERS=true, and then use the old, static db_block_buffers instead of new, dynamic db_cache_size - and can't use db_cache_advice either). So, theoretically, I believe you could use 1GB for Windows, 3GB for your PGA/SGA and then use the remaining 28GB for your buffer cache. I don't think there is anyway to allocate 4-6gb for PGA on Windows, but maybe someone else will have an idea. Have you opened a TAR?

I've used the 3GB switch a few times with no problems, but have never used the second method for accessing > 3GB. If you try it, please let me know how it goes.

Thanks,
Brandon

-----Original Message-----

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Ken Naim
Sent: Thursday, July 28, 2005 9:15 AM
To: oracle-l_at_freelists.org
Subject: Large PGA for a data warehouse on Windows 2003 advanced server(32 bit)

Dear List,

I am developing a data warehouse using Oracle 10g R1 on Windows 2003 advanced server(32 bit). The server has 32gb of ram and ideally I'd like to allocate a good portion of it to the pga and not just db block buffers. As I understand it windows "sees" 4gb of ram, 2gb of which is for windows, 1gb which is used for db block buffers which can map to higher regions of memory for larger amounts of db block buffers, leaving only 1gb of memory for the sga and pga. I'd like to know if there is a way to use more of the ram for the pga, in the neighborhood of 4-6gb.

My background is on the unix side, so please keep the switch to linux comments to a minimum. I do not have a choice in this matter.

Thanks,

Ken Naim

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