CHAPTER 5Interpreting Common I/O Related Wait Events

I/O operations are an essential part of processing and often represent a major portion of processing time. This is because I/Os are complicated operations involving many layers and components of a computer system, including software components such as Oracle, the disk volume manager, the server operating system, and the disk operating system, as well as hardware components such as buffers, I/O cards, cables, networks, routers, switches, storage controllers, and physical disks. Every component has its own attributes. There are many places that a mismatch or misconfiguration can easily degrade the I/O throughput and application performance.

There are also two basic types of I/O operations: synchronous ...

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