Chapter 7. Oracle Kernel Timings

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Regardless of whether you access the Oracle kernel's timing statistics through extended SQL trace data, V$ fixed views, or even by hacking directly into the Oracle shared memory segment beneath those V$ fixed views, the time statistics you're accessing were obtained using a simple set of operating system function calls. Regardless of which interface you use to access them, those timing statistics are subject to the limitations inherent in the operating system timers that were used to produce them. This chapter explains those limitations and describes their true impact upon your work.

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