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 |