Shared memory in solaris 10 with oracle

Hi, I am a newbie to solaris and i have some questions on shared memory, Oracle in Solaris
My Questions might seem different, however please do read and try to answer. Thanks in advance.
1) if a solaris server has say 40gb of Ram, what would be the maximum size of a shared memory segment in this machine?
I know that if the server has 40GB. then max shared memory size is 10GB i.e. one fourth of ram, however not sure
2) What is the maximum size of a shared memory segment in solaris that a root user can define.
+ i know that its some where near 14 GB not very sure +
3) Assume i have created a user X and i allocated say 10GB limit for this user for shared memory.
I login to solaris using X and now, can i increase the size of the shared memory that this user can use?
I have a situation, where the root user, created a user named DBA and the root user allocated some 15gb for this DBA user as the max SHM limit.
Now the DBA user has set the max limit for shared memory as 1TB, which is causing hell of problems in the system.
* I am Not very sure on the concept. I am new to this product and facing this problem. please advice.*
+ Thanks +
Krishnakanth (Simply KK)

Not sure why your "oracle" user (owner who will be creating the instance) has been assigned the project user.root. I would say create a seperate project may be "dba" and give access to this project to the owner of the user who will be creating the oracle instance.
and then try to issue the command:
prctl -n project.max-shm-memory -v 8gb -r -i project dba
and check to see if you are still facing a problem?
Edited by: somjitdba on Apr 2, 2009 9:54 PM

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In Solaris 10, you are not required to make changes to the /etc/system file to implement the System V IPC. Solaris 10 uses the resource control facility for its implementation. However, Oracle recommends that you set both resource control and /etc/system/ parameters. Operating system parameters not replaced by resource controls continue to affect performance and security on Solaris 10 systems.
Then, the doc states to set a project shared mem value of 2GB:
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If your SGA was greater than 2G I'm nor wondering why "oracle did not work at all".
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Note: shmsys:shminfo_shmmax != project.max-shm-memory. "project.max-shm-memory" is replacement of "shmsys:shminfo_shmmax" but function of these parameters differs.
"project.max-shm-memory resource control limits the total amount of shared memory of one project, whereas previously, the shmsys:shminfo_shmmax parameter limited the size of a single shared memory segment."
Relevant link to Sun docs: http://docs.sun.com/app/docs/doc/819-2724/chapter1-33

Shared memory in solaris 10 with oracle

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