22.12.9 Performance Schema Summary Tables

22.12.9.1 Wait Event Summary Tables

22.12.9.2 Stage Summary Tables

22.12.9.3 Statement Summary Tables

22.12.9.4 Object Wait Summary Table

22.12.9.5 File I/O Summary Tables

22.12.9.6 Table I/O and Lock Wait Summary Tables

22.12.9.7 Socket Summary Tables

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_account_by_event_name: Wait events per account and event name

• events_waits_summary_by_host_by_event_name: Wait events per host name and event name

• events_waits_summary_by_instance: Wait events per instance

• events_waits_summary_by_thread_by_event_name: Wait events per thread and event name

• events_waits_summary_by_user_by_event_name: Wait events per user name and event name

• events_waits_summary_global_by_event_name: Wait events per event name

Stage Summaries

• events_stages_summary_by_account_by_event_name: Stage events per account and event name

• events_stages_summary_by_host_by_event_name: Stage events per host name and event name

• events_stages_summary_by_thread_by_event_name: Stage waits per thread and event name

• events_stages_summary_by_user_by_event_name: Stage events per user name and event name

• events_stages_summary_global_by_event_name: Stage waits per event name

Statement Summaries

• events_statements_summary_by_account_by_event_name: Statement events per account and event name

• events_statements_summary_by_digest: Statement events per schema and digest value

• events_statements_summary_by_host_by_event_name: Statement events per host name and event name

• events_statements_summary_by_thread_by_event_name: Statement events per thread and event name

• events_statements_summary_by_user_by_event_name: Statement events per user name and event name

• events_statements_summary_global_by_event_name: Statement events per event name

Object Wait Summaries

• objects_summary_global_by_type: Object summaries

File I/O Summaries

• file_summary_by_event_name: File events per event name

• file_summary_by_instance: File events 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

Socket Summaries

• socket_summary_by_instance: Socket waits and I/O per instance

• socket_summary_by_event_name: Socket waits and I/O 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. Generally, 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. Exceptions to this truncation behavior are noted in individual summary table sections.