The setup_timers Table

The setup_timers table shows the currently selected event timers:

mysql> SELECT * FROM setup_timers;
+-----------+-------------+
| NAME | TIMER_NAME |
+-----------+-------------+
| idle | MICROSECOND |
| wait | CYCLE |
| stage | NANOSECOND |
| statement | NANOSECOND |
+-----------+-------------+

The setup_timers table has these columns:

• NAME

  The type of instrument the timer is used for.

• TIMER_NAME

  The timer that applies to the instrument type. This column can be modified.

The setup_timers.TIMER_NAME value can be changed to select a different timer. The value can be any of the values in the performance_timers.TIMER_NAME column. For an explanation of how event timing occurs, see , "Performance Schema Event Timing".

Modifications to the setup_timers table affect monitoring immediately. Events already in progress use the original timer for the begin time and the new timer for the end time, which leads to unpredictable results. If you make timer changes, you may want to use TRUNCATE TABLE to reset Performance Schema statistics.

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