Re: Real life memory limits under UNIX/Linux
- From: Jared Still <jkstill@xxxxxxxxx>
- To: att755@xxxxxxxxxxx
- Date: Thu, 9 Jun 2005 10:04:06 -0700
Tim,
You might like to read MetaLink note 260152.1 "Summary About the Large SGA &
Address Space on Linux".
For comparison you might want to consider 225349.1 "Implementing Address
Windowing Extensions (AWE) or VLM on Windows Platforms"
HTH
Jared
On 6/9/05, Tim Onions <att755@xxxxxxxxxxx> wrote:
>
> Dear All
>
> I'm looking for a little guidance. Having lived (suffered) as an Oracle
> DBA
> on Windows 2000/2003 32bit for too long I'm now proposing to the board we
> should move to a "proper" environment. My main gripe with Windows is the
> memory architecture and how the single Oracle.exe process has to live
> within
> 3Gb on 32bit. Sure 64bit ups that but if we have to move why not consider
> all options not just blindly follow MS?
>
> I'm trying to put together what the real limits in memory are under Unix
> (probably HP-UX as HP are our main supplier) and Linux (RH looks soooo
> good
> on paper when comapred with MS). I've trawled the relavant home pages and
> got some good info but some tends to be contradictory if not downright
> unclear. Initially we'd use Oracle 9i as I'm not comforatble with 10g yet.
>
> What I would like is some guidance (or pointers to good trustworthy FAQs)
> on
> how much memory each Oracle process can use - for instance 32bit RH Linux
> says 4Gb per process but does the OS steal any (coz Windows would). Or is
> that really 4Gb per process - so if I had 64Gb in the machine I get 4Gb
> for
> a number of oracle process should I need them. I am going to get
> questioned
> on that when I make my proposals and would like hard facts not vendor
> "promises". Also are there any other gotchas I need to know about (and can
> relate plenty in Windows I can assure you). Yes I'm naive when it comes to
> such things on Unix/Linux!
>
> Thanks for even reading this far!
>
--
Jared Still
Certifiable Oracle DBA and Part Time Perl Evangelist
--
//www.freelists.org/webpage/oracle-l
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