v$eventmetric

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v$eventmetric

Oracle Tips by Burleson Consulting

The v$eventmetric reports wait metrics as the number of sessions waiting during the sample interval, the number of waits, and the wait time. This view contains a single row per every wait event. The following metric_by_time.sql query returns a list of non-idle wait events that recently experienced the most wait time:

metric_by_time.sql

SELECT

to_char(m.begin_time,'hh24:mi') "start time",

to_char(m.end_time,'hh24:mi') "end time",

n.name,

m.time_waited,

m.num_sess_waiting,

m.wait_count

FROM

v$eventmetric m,

v$event_name n

WHERE

m.event_id = n.event_id

AND n.wait_class <> 'Idle' -- add your event metric name here

AND m.time_waited > 0

ORDER BY 4 DESC;

SEE CODE DEPOT FOR FULL SCRIPTS

The following output has a breakdown, by time, of all of the wait events and the counts of the number of times waited during the AWR snapshot period:

start end t NAME TIME_WAITED NUM_SESS_WAITING WAIT_COUNT

----- ----- ---------------------------- ----------- ---------------- --------

17:29 17:30 control file parallel write 29 0 19

17:29 17:30 latch free 4 0 8

17:29 17:30 db file parallel write 1 0 7

SEE CODE DEPOT FOR FULL SCRIPTS

This is an excerpt from my latest book "Oracle Tuning: The Definitive Reference".

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts:

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

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