Re: SWAP Space Confusion Note 1354525.1

From: Niall Litchfield <niall.litchfield_at_gmail.com>
Date: Tue, 22 Jan 2013 16:28:37 +0000
Message-ID: <CABe10sazuXToBU5dRtPDZfj63MWqKm0XdejqZ1CbV_pANLgAhw_at_mail.gmail.com>

Chris,
The 11g values at least have the benefit of being (mostly) consistent. If you follow the 10g guide on a system with 8gb of RAM you'd want 8gb of swap, a requirement that reduces to 7.5gb of SWAP for a system with 10gb of RAM. The same issue arises around the 2gb ram line as well of course. My take if you can afford it, set 16gb and monitor for swapping at the O/S level for a while assuming you don't see any ignore from then on in.

IIRC you might be running Windows in which case http://members.shaw.ca/bsanders/WindowsGeneralWeb/RAMVirtualMemoryPageFileEtc.htmis as good a guide as I am aware of, though it was largely written in 32bit
days. if you are running 32bit windows then swapping isn't your highest priority improvement :)

On Tue, Jan 22, 2013 at 4:07 PM, <Christopher.Taylor2_at_parallon.net> wrote:

> If I'm reading this right, for systems with a lot of RAM, the recommended
> value for 10.2 and above is 16GB for swap when memory is 16GB or higher,
> *OR* am I reading this entirely incorrectly?
> It's not exactly clear.
>
>
>
> Ref: 10gR2 SWAP Space Requirement For Systems Having Huge RAM [ID
> 1354525.1]
>
> Per the above doc, the "GOAL" section says:
> "For Systems having Huge Memory (RAM) is it really required to have SWAP
> Space as 0.75 X RAM"
>
> Per the Solution it says:
> Solution
> As per the Documentation below is the swap space requirement for 10gR2:
> RAM Swap Space
> === =========Up to 512 MB 2
> times the size of RAM
> Between 1024 MB and 2048 MB 1.5 times the size of RAM
> Between 2049 MB and 8192 MB Equal to the size of RAM
> More than 8192 MB 0.75 times the size of RAM
>
> As part of Unpublished Documentation Bug below are the new values for SWAP
> Space requirements approved by Oracle Development Team and also updated in
> 11.1 and 11.2 Install guides as below:
> RAM Swap Space
> === =========Between 1 GB and 2 GB 1.5 times the
> size of RAM
> Between 2 GB and 16 GB Equal to the size of RAM
> More than 16 GB 16 GB
>
> All the other pre-requisites mentioned for Oracle Database Software in the
> installation guide published by Oracle Development Team need to be
> completed as appropriate.
>
> You may proceed with the swap space requirements as mentioned in the
> updated guides and ignore any swap related warnings during the installation
> of 10gR2.
>
>
>
> Chris Taylor
> Oracle DBA
> Parallon IT&S
>
>
> --
> http://www.freelists.org/webpage/oracle-l
>
>
>

-- 
Niall Litchfield
Oracle DBA
http://www.orawin.info


--
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Received on Tue Jan 22 2013 - 17:28:37 CET