RE: parsing puzzle

  • From: "Allen, Brandon" <Brandon.Allen@xxxxxxxxxxx>
  • To: Joe A-C <jwc7744@xxxxxxxxx>, "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
  • Date: Fri, 9 Apr 2010 12:22:38 -0700

Because they report instance-wide stats, they could be showing you wait events 
for processes that are completely unrelated to the problems you're trying to 
troubleshoot.  And also since they are (usually) at infrequent intervals, 
transient problems can easily be buried by other more persistent events.  For 
example, a session that hangs for 5 minutes blocked by another transaction's 
blocking lock - this 5 minute delay could be a major problem for some business 
critical function that you're trying to troubleshoot, but if you look at an AWR 
report over a 1 hour interval, those 5 minutes of waiting on the blocking 
lock/enqueue aren't likely to show up in your top wait events.


-----Original Message-----
From: Joe A-C [mailto:jwc7744@xxxxxxxxx]

Why do you say that the AWR reports are likely to be misleading?

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