Documentation Home
MySQL 8.4 Reference Manual
Related Documentation Download this Manual
PDF (US Ltr) - 40.0Mb
PDF (A4) - 40.1Mb
Man Pages (TGZ) - 258.6Kb
Man Pages (Zip) - 365.7Kb
Info (Gzip) - 4.0Mb
Info (Zip) - 4.0Mb


MySQL 8.4 Reference Manual  /  ...  /  The io_by_thread_by_latency and x$io_by_thread_by_latency Views

30.4.3.10 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.