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.

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.

Wait Event Summaries

Table 22.3 Performance Schema Wait Event Summary Tables

Table Name	Description
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

Table 22.4 Performance Schema Stage Event Summary Tables

Table Name	Description
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

Table 22.5 Performance Schema Statement Event Summary Tables

Table Name	Description
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

Table 22.6 Performance Schema Object Event Summary Tables

Table Name	Description
objects_summary_global_by_type	Object summaries

File I/O Summaries

Table 22.7 Performance Schema File I/O Event Summary Tables

Table Name	Description
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 22.8 Performance Schema Table I/O and Lock Wait Event Summary Tables

Table Name	Description
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

Table 22.9 Performance Schema Socket Event Summary Tables

Table Name	Description
socket_summary_by_event_name	Socket waits and I/O per event name
socket_summary_by_instance	Socket waits and I/O per instance