MySQL 5.7 Reference Manual Including MySQL NDB Cluster 7.5 and NDB Cluster 7.6
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:
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.
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.