| Doubt on Oracle Post-Wait Extension in Semaphore allocation [message #207776] |
Thu, 07 December 2006 00:22 |
girishta
Messages: 30
Registered: December 2006
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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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