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Linux Recipes for Oracle DBAs by Charles Kim, Bernard Lopuz, Darl Kuhn

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Chapter 9. Viewing and Configuring System Resources

As part of normal operations, Oracle database processes constantly coordinate and communicate with system server processes. In Linux, this type of process-to-process coordination is referred to as interprocess communication (IPC). Linux supports three types of interprocess communication mechanisms: semaphores, shared memory, and message queues. Oracle database applications typically require significant amounts of semaphore and shared memory resources to function properly. This chapter focuses on how to view and manage these critical system resources.

A semaphore is a construct used by the operating system to control what processes can have access to other server resources such as shared memory. ...

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