Re: Physical Memory Fully Used and Swap is Not Used
From: Niall Litchfield <niall.litchfield_at_gmail.com>
Date: Tue, 23 Jun 2009 07:23:27 +0100
Message-ID: <7765c8970906222323l21052cc0qfdacd8753e1753e8_at_mail.gmail.com>
actually on Linux all it shows is that the memory is at least adequate, not that it is sized perfectly. It could be that oracle is only using say 1g of that RAM and all the rest is 'in-use' for caching the linux filesystems. On Linux you expect memory to show as all 'in-use' until you start swapping :(. So I agree that there isn't memory pressure as far as the o/s is concerned, but not that the box is sized perfectly for the workload, we don't have enough information for that.
Date: Tue, 23 Jun 2009 07:23:27 +0100
Message-ID: <7765c8970906222323l21052cc0qfdacd8753e1753e8_at_mail.gmail.com>
actually on Linux all it shows is that the memory is at least adequate, not that it is sized perfectly. It could be that oracle is only using say 1g of that RAM and all the rest is 'in-use' for caching the linux filesystems. On Linux you expect memory to show as all 'in-use' until you start swapping :(. So I agree that there isn't memory pressure as far as the o/s is concerned, but not that the box is sized perfectly for the workload, we don't have enough information for that.
Niall
On Tue, Jun 23, 2009 at 7:15 AM, Mathias Magnusson < mathias.magnusson_at_gmail.com> wrote:
> Are you trying to tune or to understand memory? There is nothing here that
> would indicate a problem. If you use all you memory and no swap, then that
> would be optimal. It shows that your box is sized perfectly and you do not
> ned to use swap
>
>
-- Niall Litchfield Oracle DBA http://www.orawin.info -- http://www.freelists.org/webpage/oracle-lReceived on Tue Jun 23 2009 - 01:23:27 CDT