Socket Summary Tables

The socket summary tables aggregate timer and byte count information for socket operations:

• socket_summary_by_instance: Aggregate timer and byte count statistics generated by the wait/io/socket/* instruments for all socket I/O operations, per socket instance. When a connection terminates, the row in socket_summary_by_instance corresponding to it is deleted.
• socket_summary_by_event_name: Aggregate timer and byte count statistics generated by the wait/io/socket/* instruments for all socket I/O operations, per socket instrument.

The socket summary tables do not aggregate waits generated by idle events while sockets are waiting for the next request from the client. For idle event aggregations, use the wait-event summary tables; see , "Event Wait Summary Tables".

TRUNCATE TABLE is permitted for summary tables. It resets the counters to zero rather than removing rows.

The socket summary tables have these grouping columns to indicate how events are aggregated:

• socket_summary_by_instance has an OBJECT_INSTANCE_BEGIN column. Each row summarizes events for a given object.
• socket_summary_by_event_name has an EVENT_NAME column. Each row summarizes events for a given instrument.

The socket summary tables have these summary columns containing aggregated values:

• COUNT_STAR, SUM_TIMER_WAIT, MIN_TIMER_WAIT, AVG_TIMER_WAIT, MAX_TIMER_WAIT

  These columns aggregate all operations.

• COUNT_READ, SUM_TIMER_READ, MIN_TIMER_READ, AVG_TIMER_READ, MAX_TIMER_READ, SUM_NUMBER_OF_BYTES_READ

  These columns aggregate all receive operations (RECV, RECVFROM, and RECVMSG).

• COUNT_WRITE, SUM_TIMER_WRITE, MIN_TIMER_WRITE, AVG_TIMER_WRITE, MAX_TIMER_WRITE, SUM_NUMBER_OF_BYTES_WRITE

  These columns aggregate all send operations (SEND, SENDTO, and SENDMSG).

• COUNT_MISC, SUM_TIMER_MISC, MIN_TIMER_MISC, AVG_TIMER_MISC, MAX_TIMER_MISC

  These columns aggregate all other socket operations, such as CONNECT, LISTEN, ACCEPT, CLOSE, and SHUTDOWN. There are no byte counts for these operations.

The socket_summary_by_instance table also has an EVENT_NAME column that indicates the class of the socket: client_connection, server_tcpip_socket, server_unix_socket. This column can be grouped on to isolate, for example, client activity from that of the server listening sockets.

These tables were added in MariaDB 5.6.3.

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