30.4.3.14 The io_global_by_wait_by_latency and x$io_global_by_wait_by_latency Views

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

The io_global_by_wait_by_latency and x$io_global_by_wait_by_latency views have these columns:

• event_name

  The I/O event name, with the wait/io/file/ prefix stripped.

• total

  The total number of occurrences of the I/O event.

• total_latency

  The total wait time of timed occurrences of the I/O event.

• avg_latency

  The average wait time per timed occurrence of the I/O event.

• max_latency

  The maximum single wait time of timed occurrences of the I/O event.

• read_latency

  The total wait time of timed read occurrences of the I/O event.

• write_latency

  The total wait time of timed write occurrences of the I/O event.

• misc_latency

  The total wait time of timed other occurrences of the I/O event.

• count_read

  The number of read requests for the I/O event.

• total_read

  The number of bytes read for the I/O event.

• avg_read

  The average number of bytes per read for the I/O event.

• count_write

  The number of write requests for the I/O event.

• total_written

  The number of bytes written for the I/O event.

• avg_written

  The average number of bytes per write for the I/O event.