29.12.20 Performance Schema Summary Tables

29.12.20.1 Wait Event Summary Tables

29.12.20.2 Stage Summary Tables

29.12.20.3 Statement Summary Tables

29.12.20.4 Statement Histogram Summary Tables

29.12.20.5 Transaction Summary Tables

29.12.20.6 Object Wait Summary Table

29.12.20.7 File I/O Summary Tables

29.12.20.8 Table I/O and Lock Wait Summary Tables

29.12.20.9 Socket Summary Tables

29.12.20.10 Memory Summary Tables

29.12.20.11 Error Summary Tables

29.12.20.12 Status Variable 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 29.5 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 29.6 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 29.7 Performance Schema Statement Event Summary Tables

Table Name	Description
events_statements_histogram_by_digest	Statement histograms per schema and digest value
events_statements_histogram_global	Statement histogram summarized globally
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_program	Statement events per stored program
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
prepared_statements_instances	Prepared statement instances and statistics

Table Name	Description

Transaction Summaries

Table 29.8 Performance Schema Transaction Event Summary Tables

Table Name	Description
events_transactions_summary_by_account_by_event_name	Transaction events per account and event name
events_transactions_summary_by_host_by_event_name	Transaction events per host name and event name
events_transactions_summary_by_thread_by_event_name	Transaction events per thread and event name
events_transactions_summary_by_user_by_event_name	Transaction events per user name and event name
events_transactions_summary_global_by_event_name	Transaction events per event name

Object Wait Summaries

Table 29.9 Performance Schema Object Event Summary Tables

Table Name	Description
objects_summary_global_by_type	Object summaries

File I/O Summaries

Table 29.10 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 29.11 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 29.12 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

Memory Summaries

Table 29.13 Performance Schema Memory Operation Summary Tables

Table Name	Description
memory_summary_by_account_by_event_name	Memory operations per account and event name
memory_summary_by_host_by_event_name	Memory operations per host and event name
memory_summary_by_thread_by_event_name	Memory operations per thread and event name
memory_summary_by_user_by_event_name	Memory operations per user and event name
memory_summary_global_by_event_name	Memory operations globally per event name

Error Summaries

Table 29.14 Performance Schema Error Summary Tables

Table Name	Description
events_errors_summary_by_account_by_error	Errors per account and error code
events_errors_summary_by_host_by_error	Errors per host and error code
events_errors_summary_by_thread_by_error	Errors per thread and error code
events_errors_summary_by_user_by_error	Errors per user and error code
events_errors_summary_global_by_error	Errors per error code

Status Variable Summaries

Table 29.15 Performance Schema Error Status Variable Summary Tables

Table Name	Description
status_by_account	Session status variables per account
status_by_host	Session status variables per host name
status_by_user	Session status variables per user name