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29.12.20.6 Object Wait Summary Table

The Performance Schema maintains the objects_summary_global_by_type table for aggregating object wait events.

Example object wait event summary information:

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mysql> SELECT * FROM performance_schema.objects_summary_global_by_type\G ... *************************** 3. row *************************** OBJECT_TYPE: TABLE OBJECT_SCHEMA: test OBJECT_NAME: t COUNT_STAR: 3 SUM_TIMER_WAIT: 263126976 MIN_TIMER_WAIT: 1522272 AVG_TIMER_WAIT: 87708678 MAX_TIMER_WAIT: 258428280 ... *************************** 10. row *************************** OBJECT_TYPE: TABLE OBJECT_SCHEMA: mysql OBJECT_NAME: user COUNT_STAR: 14 SUM_TIMER_WAIT: 365567592 MIN_TIMER_WAIT: 1141704 AVG_TIMER_WAIT: 26111769 MAX_TIMER_WAIT: 334783032 ...

The objects_summary_global_by_type table has these grouping columns to indicate how the table aggregates events: OBJECT_TYPE, OBJECT_SCHEMA, and OBJECT_NAME. Each row summarizes events for the given object.

objects_summary_global_by_type has the same summary columns as the events_waits_summary_by_xxx tables. See Section 29.12.20.1, “Wait Event Summary Tables”.

The objects_summary_global_by_type table has these indexes:

  • Primary key on (OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME)

TRUNCATE TABLE is permitted for the object summary table. It resets the summary columns to zero rather than removing rows.