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Performance Schema Event Timing

Events are collected by means of instrumentation added to the server source codę. Instruments time

events, which is howthe Performance Schema provides an idea of howlong events take. It is also

possible to configure instruments not to collect timing information. This section discusses the available

timers and their characteristics, and how timing values are represented in events. Two tables provide timer information:

•    per formance_timers lists the available timers and their characteristics.

•    setup_timers indicates which timers are used for which instruments.

Each timer row in setup_timers must refer to one of the timers listed in

performance_timers.