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Doubt on Oracle Post-Wait Extension in Semaphore allocation [message #207776]

Thu, 07 December 2006 00:22

girishta
Messages: 30
Registered: December 2006

Member

Hi

This is regarding Semaphore allocation
In Metalink ...They have said like this....

Machines with a post-wait kernel extension, Oracle does not need to allocate semaphores (because it doesn't need to implement its own post-wait mechanism).

The Oracle Post-Wait Kernel Extension implements an optimized mechanism of inter-process communications without the overhead of signal handlers or semaphores. For better performance on your UnixWare system, you should set use_post_wait_driver=TRUE in your initORCL.ora file, before starting your Oracle database. (By default use_post_wait_driver=TRUE).

In above definition , Are Signal handlers and Semaphores one and the same?? If no whats the difference.

I want to know what kind of machines are these.? Can you give any example...

Regards
Giri

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