Performance Schema Summary Tables Table Name Description table_io_waits_summary_by_table Table I/O waits per table table_lock_waits_summary_by_table Table lock waits per table 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 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 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 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 The Performance Schema maintains tables for collecting current and recent wait events, and aggregates that information in summary tables. Section 27.12.4, “Performance Schema Wait Event Tables”  describes 5050 27.12.20.1 Wait Event Summary Tables Status Variable Summaries Table 27.15 Performance Schema Error Status Variable Summary Tables Table 27.14 Performance Schema Error Summary Tables Table 27.13 Performance Schema Memory Operation Summary Tables Table 27.12 Performance Schema Socket Event Summary Tables Error Summaries Memory Summaries Socket Summaries