sys Schema Views The host from which the client connected. Rows for which the  HOST  column in the underlying Performance Schema table is  NULL  are assumed to be for background threads and are reported with a host name of  background . The total number of statements for the host. The total wait time of timed statements for the host. The maximum single wait time of timed statements for the host. The total time waiting for locks by timed statements for the host. The total number of rows returned by statements for the host. The total number of rows read from storage engines by statements for the host. The total number of rows affected by statements for the host. The total number of full table scans by statements for the host. These views summarize informaion about statements executed, grouped by host and statement type. By default, rows are sorted by host and descending total latency. The  host_summary_by_statement_type  and  x$host_summary_by_statement_type  views have these columns: The host from which the client connected. Rows for which the  HOST  column in the underlying Performance Schema table is  NULL  are assumed to be for background threads and are reported with a host name of  background . The final component of the statement event name. 5144 • total • statement • host 28.4.3.6 The host_summary_by_statement_type and x$host_summary_by_statement_type Views • full_scans • rows_affected • rows_examined • rows_sent • lock_latency • max_latency • total_latency • total • host