Re: [suse-oracle] Oracle Automatic Memory Management (AMM) on Suse
"Arun Singh" <[email protected]> Tue, 12 Feb 2013 11:34:27 -0700
| Newsgroups | gmane.linux.suse.oracle.general |
|---|---|
| Message-ID | <[email protected]> |
Hello Arturo, You have to adjust /dev/shm, if you are increasing SGA/PGA size with new RA= M (16 -> 64), as Oracle DB is main consumer here. Hope this helps, Arun >>> On 2/12/2013 at 10:16 AM, Arturo Gutierrez <[email protected]> wrote: > Hello everyone, > = > I have a question about the automatic memory management introduced in = > Oracle11g R1 called AMM. > = > As you know with this memory management is defined by parameter = > MEMORY_TARGET the amounts of memory allocated to SGA / PGA globally, and = > MMAN (Memory Manager) memory transfers from one area to another = > dynamically depending on the workload. In what is so far working on Red = > Hat. Had to define a suitable size in the virtual memory system (tmpfs). > example: > tmpfs / dev / shm tmpfs size =3D 1200m 0 0 > To avoid errors like: > SQL> startup > ORA-00845: MEMORY_TARGET not supported on This System > = > I observed a Suse system where you are managing a RAC system with a 12GB = > MEMORY_TARGET settings and the server has 16GB of RAM. > Normally the size of / dev / shm is half of RAM. So you have to resize = > it in / etc / fstab. > However, in this system is not defined superior value and the instance = > is enabled with this configuration. > I wanted to know if this memory management Suse uses another mechanism? > And that must be taken into account for a RAM upgrade, as this thinking = > go from 16GB to 64GB. > = > Many Thanks > Arturo > = > -- = > = > = > = > = > Arturo Guti=E9rrez G=F3mez > = > = > Formador/Consultor Tecnologias Oracle > = > = > = > Oracle DBA Certified Professional OCP [7.3-11g] > Oracle Real Application Clusters Certified professional > = > Oracle Linux Certified professional > = > = > = > = > = > Mov=EDl 61 64 70 190 > = > = > = > = > * * > = > * * > = > * * > = > / / > = > _______________________________________________ > suse-oracle mailing list > [email protected] = > http://listx.novell.com/mailman/listinfo/suse-oracle _______________________________________________ suse-oracle mailing list [email protected] http://listx.novell.com/mailman/listinfo/suse-oracle