Do Not Forget the Business Transaction Throughput and Response Time

(Linchi Shea) People often rely on rules of thumb to tell whether there is a problem. DBAs are no exception. For instance, we are told that if the I/O latency (i.e. Avg. Disk sec/Read or Avg. Disk sec/Write) is greater 20 milliseconds, it’s bad. In addition, if the current disk queue length is signi

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