query delay

I am running 10gr2 on 4 blades, everything is running much faster than
on the old server ......except;

 

Periodically simple queries will take between 1 - 2 minutes.  Simple as
in 

SELECT * 

FROM small_table. 

 

This delay does not happen all the time.  I do not think this is an
index issue.  I think this is a RAC wait issue.

 

 

I will occasionally (maybe once a day)  get some of the following:

 

   Metrics "Global Cache Blocks Lost" is at 25

   Metrics "Database Time Spent Waiting (%)" is at 57.65708 for event
class "Cluster"

 

 

Can anyone think of a way to investigate this?

 

Thanks

 

Randy

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