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RE: 64-Bit Oracle on Windows 2003

From: Allen, Brandon <>
Date: Wed, 16 Aug 2006 17:10:41 -0700
Message-ID: <04DDF147ED3A0D42B48A48A18D574C45059E1CEE@NT15.oneneck.corp>

I've never actually experienced it - just speaking based on some reading and my basic understanding of the hardware. My main point wasn't that 64-bit was slower than 32-bit, just that a migration from 32-bit to 64-bit alone shouldn't be expected to boost performance. Here is at least some minimal info to back me up from Metalink 107201.1:

 "32-bit databases run on systems with a small number of 32-bit CPUs (4-6) may
see some degradation in performance if moved to 64-bit systems also with a
small number of 64-bit CPUs.

Applications will achieve the benefits of improved scalability on 64-bit

machine only if they are memory intensive. 64-bit applications have bigger data
structures because memory has to be addressed with a larger number of bits.
Larger data structures translate into addtional memory requirements per process."

And here are a few more links: 05480694 122627&start=-1

If someone else has some info to prove me wrong, please share it.

-----Original Message-----
[] On Behalf Of Kevin Closson Sent: Wednesday, August 16, 2006 4:14 PM To:
Subject: RE: 64-Bit Oracle on Windows 2003                   

>> Hi Donald, I haven't been following this thread so please
forgive me if I'm repeating something that's already been said, but you should be aware that migrating from 32-bit to 64-bit alone (all other variables remaining the same) can be expected to actually degrade

performance slightly. 

...can you tell us why? I have seen only extremely odd scenarios where this is true, and it generally isn't the Oracle Server.


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Received on Wed Aug 16 2006 - 19:10:41 CDT

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