30.4.3.4 The host_summary_by_stages and x$host_summary_by_stages Views

These views summarize statement stages, grouped by host. By default, rows are sorted by host and descending total latency.

The host_summary_by_stages and x$host_summary_by_stages 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.

• event_name

  The stage event name.

• total

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

• total_latency

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

• avg_latency

  The average wait time per timed occurrence of the stage event for the host.