Summary tables provide aggregated information for terminated events over time. The tables in this group summarize event data in different ways.
Wait Event Summaries:
events_waits_summary_by_instance:
Wait events summarized per instance
events_waits_summary_by_thread_by_event_name:
Wait events summarized per thread and event name
events_waits_summary_global_by_event_name:
Wait events summarized per event name
File I/O Summaries:
file_summary_by_event_name:
File events summarized per event name
file_summary_by_instance: File
events summarized per file instance
The events_waits_summary_global_by_event_name
table was named
EVENTS_WAITS_SUMMARY_BY_EVENT_NAME before
MySQL 5.5.7.
Each summary table has grouping columns that determine how to group the data to be aggregated, and summary columns that contain the aggregated values. Tables that summarize events in similar ways often have similar sets of summary columns and differ only in the grouping columns used to determine how events are aggregated.
Summary tables can be truncated with
TRUNCATE TABLE. The effect is to
reset the summary columns to 0 or NULL, not
to remove rows. This enables you to clear collected values and
restart aggregation. That might be useful, for example, after
you have made a runtime configuration change.