How to Modify Linux Kernel Semaphores Parameters
Oracle, DB2 or SAP uses UNIX/Linux resources such as shared memory, swap space, and semaphores extensively for interprocess communication. If the kernel parameters settings are insufficient, you will experience some problems during installation and/or instance startup.
Basically this post will focus on “How to modify Linux Kernel Semaphores parameters”.
Semaphores can best be described as counters which are used to provide synchronization between processes or between threads within a process for shared resources like shared memories. System V semaphores support semaphore sets where each one is a counting semaphore. So when an application requests semaphores, the kernel releases them in “sets”. The number of semaphores per set can be defined through the kernel parameter SEMMSL.
1)Show current SEMAPHORES parameter
server01:~ # ipcs -l
—— Semaphore Limits ——–
max number of arrays = 1024
max semaphores per array = 1250
max semaphores system wide = 256000
max ops per semop call = 100
semaphore max value = 32767
OR
server01:~ # cat /proc/sys/kernel/sem
1250 256000 100 1024
OR
server01:~ # cat /etc/sysctl.conf
kernel.sem = 1250 256000 100 1024
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Rapidshare Premium Account Give Away 01
Updated: The winner goes to Will Chua. An update email will send to Will Chua soon.
This is the first time Planet Malaysia giving away FREE One Month Rapidshare Premium Account worth EUR$6.99. We know the prize is not that much but we promised, we’ll try to have more promotion soon. Stay tune!
Simple Step to win Rapidshare Premium Acount:
Subscribe to Planet Malaysia OR Planet Malaysia Blog Feed.
OR
Write a post with minimum one link back to http://www.planetmy.com or http://www.planetmy.com/blog.
Send us an email with subject: Rapidshare Premium Account Give Away 01 at: 
This is to make sure we have your email details for lucky draw.
NOTE: Please DO NOT send us your email more than ONCE! It will NOT increase your chance in winning but only lowering your chance because I’m consider CHEATING!
The lucky draw will be held on 30 April 2008 and the result will post here. Additional email will send to winner within the next 7 days. Good luck!
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My Powerful Desktop Resources Monitor
I wrote about ‘My Personal Powerful Desktop‘ fews day ago. As you know I have Pentium Core 2 Quod Q6600 with 4Gb RAM running on top of my clone desktop. Damm powerful desktop?
Unfortunately, my machine that installed with 2 VMware ESX host, 2 Windows 2003 Server virtual machine(1 for VMware License Server & another 1 for VMware Infrastructure client), 1 OpenFiler(iSCSI) and 2 Windows 2003 server running on top of each VMware ESX host reached the bottle neck(running on VMware Workstation 6).
Note: I have the similar setup in another desktop in Office.
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My Personal Powerful Desktop
Finally my personal powerful desktop is up! I bought a clone desktop machine from Plaza Lowyat last week and total cost me around RM2500(without monitor).
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How to install Oracle VM in VMware Workstation
[tag]Oracle VM[/tag] was official released on Nov 12 2007 last month. Oracle VM is server virtualization software that fully supports both Oracle and non-Oracle applications, and is three times more efficient than other server virtualization products. Backed by Oracle's world-class support organization, customers now have a single point of enterprise-class support for their entire virtualization environments, including the Linux operating system, [tag]Oracle[/tag] Database, Fusion Middleware, and Application software. Oracle unveiled its Oracle VM hyper visor based on Xen open source hypervisor.
The following tutorial will teach you "How to install Oracle VM in VMware Workstation"
Getting the Oracle VM
To get the Oracle VM files do to the following:
- Go to http://edelivery.oracle.com/oraclevm and click continue download; you will be taken to the Oracle distributes sites.
- Fill in the registration, search for Oracle VM or follow the prompts on the screen for download.
- Unzip the Oracle VM zip file (you will see the Oracle VM ISO file later)
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