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Semaphores are not an Oracle concept per-se but a concept rooted in some Unix flavors. Please note AIX which is IBM's Unix flavor relies on post-wait drivers to accomplish the same objective.
So, why does Oracle relies on semaphores -when available? to serialize processes making sure event B happens after event A completes. This is mostly used to sync processes.
Pablo (Paul) Berzukov
Author of Understanding Database Administration available at amazon and other bookstores.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
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