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26.12.17.6 Object Wait Summary Table

Contents

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

Example object wait event summary information:

  1. mysql> SELECT * FROM performance_schema.objects_summary_global_by_type\G
  2. ...
  3. *************************** 3. row ***************************
  4.    OBJECT_TYPE: TABLE
  5.  OBJECT_SCHEMA: test
  6.    OBJECT_NAME: t
  7.     COUNT_STAR: 3
  8. SUM_TIMER_WAIT: 263126976
  9. MIN_TIMER_WAIT: 1522272
  10. AVG_TIMER_WAIT: 87708678
  11. MAX_TIMER_WAIT: 258428280
  12. ...
  13. *************************** 10. row ***************************
  14.    OBJECT_TYPE: TABLE
  15.  OBJECT_SCHEMA: mysql
  16.    OBJECT_NAME: user
  17.     COUNT_STAR: 14
  18. SUM_TIMER_WAIT: 365567592
  19. MIN_TIMER_WAIT: 1141704
  20. AVG_TIMER_WAIT: 26111769
  21. MAX_TIMER_WAIT: 334783032
  22. ...

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 26.12.17.1, “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.


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Document created the 26/06/2006, last modified the 26/10/2018
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