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Don Burleson Blog 







Inside Oracle Wait Time Tuning

Oracle Tips by Burleson Consulting
Don Burleson
(June 2005)

There has been a lot of discussion about Oracle wait event tuning, especially with the new Active Session History (ASH) in Oracle10g.  Wait Time based analysis is a highly accurate performance tuning method, but it is often a tedious, reactive process requiring lots of manual steps and significant knowledge.  There are several books on Oracle wait event tuning. This is my personal favorite:
Even though Oracle has promoted the new ASH data and incorporated it into the 10g Oracle Enterprise Manager, many people do not realize that access to ASH data requires additional Oracle licensing for the Oracle Diagnostic Pack:
There are several third-party products that compete with Oracle ASH. My favorite being the DBFlash tool from Confio, which I like because it combines detailed Wait Time analysis for Oracle with a proactive, continuous monitoring approach.  There is no need to run traces, and with DBFlash you can see the Wait Time accumulation for each SQL, and set Alerts to notify you when Waits on chosen users, programs, or SQLs gets excessive.  I also liked the trending tools, showing 5 years of Wait event data without taking up a lot of storage space.   Check it out or get an evaluation from
There is no doubt that the future of Oracle tuning lies in trend-based analysis, as I have noted in my Oracle Press STATSPACK books and my newest book "Oracle Tuning:  Time Series Optimization with the Automatic Workload Repository", where I compare the features of DBFlash with OEM:



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