30.4.3.6 The host_summary_by_statement_type and x$host_summary_by_statement_type Views

These views summarize information 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:

• host

  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.

• statement

  The final component of the statement event name.

• total

  The total number of occurrences of the statement event for the host.

• total_latency

  The total wait time of timed occurrences of the statement event for the host.

• max_latency

  The maximum single wait time of timed occurrences of the statement event for the host.

• lock_latency

  The total time waiting for locks by timed occurrences of the statement event for the host.

• cpu_latency

  The time spent on CPU for the current thread.

• rows_sent

  The total number of rows returned by occurrences of the statement event for the host.

• rows_examined

  The total number of rows read from storage engines by occurrences of the statement event for the host.

• rows_affected

  The total number of rows affected by occurrences of the statement event for the host.

• full_scans

  The total number of full table scans by occurrences of the statement event for the host.