Comments on: Oracle time units in V$ views http://dboptimizer.com/2011/07/20/oracle-time-units-in-v-views/ database performance, SQL tuning and data visualizatoin Thu, 11 Aug 2011 20:15:11 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Kyle Hailey http://dboptimizer.com/2011/07/20/oracle-time-units-in-v-views/#comment-472 Kyle Hailey Thu, 21 Jul 2011 22:07:29 +0000 http://dboptimizer.com/?p=1268#comment-472 yeah, it's depressing how much time these little inconsistencies blow for me, and especially because the documentation is wrong. The wrong documentation is what prompted me to do this post. Notice below the 11g doc says V$WAITCLASSMETRIC.TIME_WAITED is in microseconds. It's not ! http://download.oracle.com/docs/cd/B28359_01/server.111/b28320/dynviews_3115.htm#sthref3349 V$WAITCLASSMETRIC V$WAITCLASSMETRIC displays metric values of wait classes for the most recent 60-second interval. A history of the last one hour will be kept in the system. Column Datatype Description BEGIN_TIME DATE Begin time of the interval END_TIME DATE End time of the interval INTSIZE_CSEC NUMBER Interval size (in hundredths of a second) WAIT_CLASS# NUMBER Number of the class of the wait event WAIT_CLASS_ID NUMBER Identifier of the class of the wait event AVERAGE_WAITER_COUNT NUMBER Average waiter count DBTIME_IN_WAIT NUMBER Percent of database time spent in the wait TIME_WAITED NUMBER Time waited during the interval (in microseconds) WAIT_COUNT NUMBER Number of times waited yeah, it’s depressing how much time these little inconsistencies blow for me, and especially because the documentation is wrong. The wrong documentation is what prompted me to do this post. Notice below the 11g doc says V$WAITCLASSMETRIC.TIME_WAITED is in microseconds. It’s not !

http://download.oracle.com/docs/cd/B28359_01/server.111/b28320/dynviews_3115.htm#sthref3349

V$WAITCLASSMETRIC

V$WAITCLASSMETRIC displays metric values of wait classes for the most recent 60-second interval. A history of the last one hour will be kept in the system.
Column Datatype Description
BEGIN_TIME DATE Begin time of the interval
END_TIME DATE End time of the interval
INTSIZE_CSEC NUMBER Interval size (in hundredths of a second)
WAIT_CLASS# NUMBER Number of the class of the wait event
WAIT_CLASS_ID NUMBER Identifier of the class of the wait event
AVERAGE_WAITER_COUNT NUMBER Average waiter count
DBTIME_IN_WAIT NUMBER Percent of database time spent in the wait
TIME_WAITED NUMBER Time waited during the interval (in microseconds)
WAIT_COUNT NUMBER Number of times waited

]]> By: Henry Poras http://dboptimizer.com/2011/07/20/oracle-time-units-in-v-views/#comment-471 Henry Poras Thu, 21 Jul 2011 21:16:31 +0000 http://dboptimizer.com/?p=1268#comment-471 Thanks. This stuff always drives me nuts. Thanks. This stuff always drives me nuts.

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