Performance Schema Summary Tables

Summary tables provide aggregate information for terminated events over time. The tables in this group summarize event data in different ways.

Event Wait Summaries:

• events_waits_summary_global_by_event_name: Wait events summarized per event name
• 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

Stage Summaries:

• events_stages_summary_by_thread_by_event_name: Stage waits summarized per thread and event name
• events_stages_summary_global_by_event_name: Stage waits summarized per event name

Statement Summaries:

• events_statements_summary_by_thread_by_event_name: Statement events summarized per thread and event name
• events_statements_summary_global_by_event_name: Statement events summarized per event name

Object Wait Summaries:

• objects_summary_global_by_type: Object summaries

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

Table I/O and Lock Wait Summaries:

• table_io_waits_summary_by_index_usage: Table I/O waits per index
• table_io_waits_summary_by_table: Table I/O waits per table
• table_lock_waits_summary_by_table: Table lock waits per table

Connection Summaries:

• events_waits_summary_by_account_by_event_name: Wait events summarized per account and event name
• events_waits_summary_by_user_by_event_name: Wait events summarized per user name and event name
• events_waits_summary_by_host_by_event_name: Wait events summarized per host name and event name
• events_stages_summary_by_account_by_event_name: Stage events summarized per account and event name
• events_stages_summary_by_user_by_event_name: Stage events summarized per user name and event name
• events_stages_summary_by_host_by_event_name: Stage events summarized per host name and event name
• events_statements_summary_by_account_by_event_name: Statement events summarized per account and event name
• events_statements_summary_by_user_by_event_name: Statement events summarized per user name and event name
• events_statements_summary_by_host_by_event_name: Statement events summarized per host name and event name

Socket Summaries:

• socket_summary_by_instance: Socket waits and I/O summarized per instance
• socket_summary_by_event_name: Socket waits and I/O summarized per event name

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.

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