You could see high such waits in your database if you are using automatic memory management of the SGA ( the new feature in Oracle 10G )
Solution : Set manually the memory components of the SGA's database .
see also http://www.nocoug.org/Journal/NoCOUG_Journal_201008.pdf
Char problems - The semantics of comparing character columns of different types can lead to some confusion, so before I get into the main body of this note here’s a little...
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