To succeed, a performance analyst must understand the language in which a system communicates information about its performance. Unfortunately, for over a decade , the domain of Oracle time statistics has been one of the most misunderstood areas of the Oracle kernel. To understand the response time instrumentation that the Oracle kernel provides, you must understand how the Oracle kernel interacts with its host operating system. It is this operating system that allocates resources to the Oracle kernel process itself, and it is the operating system that actually supplies the timing statistics that Oracle uses to describe its own performance.
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