Easily monitor Oracle disk I/O latency

Oracle 10g v$ views and the AWR tables have some great ways to measure average I/O durations, and you can use v$event_histogram view and the dba_hist_system_event table to plot the distribution of physical disk read speed.

Plotting I/O speed with v$event_histogram

The v$event_histogram view displays a histogram of the number of waits, the maximum wait, and total wait time on a wait event basis. Using this view, a histogram showing the frequency of wait events for a range of durations can be created. This information assists in the determination of whether a wait event is a frequent problem that needs addressing or a unique event.

Read my notes here and see the scripts for measuring disk I/O speed for your Oracle database:

http://www.dba-oracle.com/t_v$event_histogram.htm

For complete details, see my book "Oracle Tuning: The Definitive Reference":

http://www.rampant-books.com/book_1002_oracle_tuning_definitive_reference_2nd_ed.htm

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