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Evaluate wait class concurrency - row cache lock

edited Jul 17, 2015 10:04AM in Database Tuning (MOSC) 3 commentsAnswered

Hello,

I have noticed from time to time, alerts on the OEM DB Control home page about waits.  These have primarily been concerning concurrency and commits.  I read an article that gave me some queries to start evaluating waits which I have displayed below.  Here are my questions:

1) I believe the first query is telling me that I have a high ratio of wait time compared to CPU.  I assume this excludes idle time.  Is this correct?

2) The second query tells me that the concurrency class is the top contributor to wait time and the third query indicates that event "row cache lock" is the primary contributor to that class.  Am I understanding this correctly?

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