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

26.4.3.10 The io_by_thread_by_latency and x$io_by_thread_by_latency Views

These views summarize I/O consumers to display time waiting for I/O, grouped by thread. By default, rows are sorted by descending total I/O latency.

The io_by_thread_by_latency and x$io_by_thread_by_latency views have these columns:

  • user

    For foreground threads, the account associated with the thread. For background threads, the thread name.

  • total

    The total number of I/O events for the thread.

  • total_latency

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

  • min_latency

    The minimum single wait time of timed I/O events for the thread.

  • avg_latency

    The average wait time per timed I/O event for the thread.

  • max_latency

    The maximum single wait time of timed I/O events for the thread.

  • thread_id

    The thread ID.

  • processlist_id

    For foreground threads, the processlist ID of the thread. For background threads, NULL.


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