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MySQL 5.7 Reference Manual  /  ...  /  The host_summary and x$host_summary Views

26.4.3.1 The host_summary and x$host_summary Views

These views summarize statement activity, file I/O, and connections, grouped by host.

The host_summary and x$host_summary 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.

  • statements

    The total number of statements for the host.

  • statement_latency

    The total wait time of timed statements for the host.

  • statement_avg_latency

    The average wait time per timed statement for the host.

  • table_scans

    The total number of table scans for the host.

  • file_ios

    The total number of file I/O events for the host.

  • file_io_latency

    The total wait time of timed file I/O events for the host.

  • current_connections

    The current number of connections for the host.

  • total_connections

    The total number of connections for the host.

  • unique_users

    The number of distinct users for the host.

  • current_memory

    The current amount of allocated memory for the host.

  • total_memory_allocated

    The total amount of allocated memory for the host.


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