RE: Oracle on Windows 2000 AS with /3GB flag

Win64 does not support /3GB switch. It isn't need in 64-bit environment.

http://support.microsoft.com/kb/294418/

Copied from support note:
System PTEs

A pool of system Page Table Entries (PTEs) that is used to map system pages such as I/O space, Kernel stacks, and memory descriptor lists. 64-bit programs use a 16-terabyte tuning model (8 terabytes User and 8 terabytes Kernel). 32-bit programs still use the 4-GB tuning model (2 GB User and 2 GB Kernel). This means that 32-bit processes that run on 64-bit versions of Windows run in a 4-GB tuning model (2 GB User and 2GB Kernel). 64-bit versions of Windows do not support the use of the /3GB switch in the boot options. Theoretically, a 64-bit pointer could address up to 16 exabytes. 64-bit versions of Windows have currently implemented up to 16 terabytes of address space.  

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of William Wagman
Sent: Monday, July 16, 2007 7:52 PM
To: Brandon.Allen_at_OneNeck.com; saints.richard_at_gmail.com; oracle-l_at_freelists.org
Subject: RE: Oracle on Windows 2000 AS with /3GB flag  

Allen,  

Does this hold true for 64-bit Windows as well? Until seeing this thread I was unaware of the /3GB switch available for windows. It sounds analogous to compiling in the hugemem kernel in Linux. Or are the two unrelated? On Technet so far the only document I have found is the 32-bit Oracle Database Platform Guide, chapter 1. Can you point out a good source of information on this please.  

Thanks.  

Bill Wagman
Univ. of California at Davis
IET Campus Data Center
wjwagman_at_ucdavis.edu
(530) 754-6208    

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Allen, Brandon
Sent: Monday, July 16, 2007 3:07 PM
To: saints.richard_at_gmail.com; oracle-l_at_freelists.org Subject: RE: Oracle on Windows 2000 AS with /3GB flag

I always use the /3G flag on all Windows database servers - for both Oracle and SQL Server. I've used it several times on different combinations of Windows, SQL & Oracle versions and never had any problems.  

Regards,

Brandon

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