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I have a performance problem on 10g -- this query takes 10 minutes on 9i but on 10g it is taking 1 hour and 20 minutes.
(Long query removed.)
Compare your database initialization parameters, and research default behavior that differs between the two versions. Also, trace the execution on each database, using dbms_support on 9i and dbms_monitor on 10g, and compare the statistics on elapsed time (including CPU time and wait time).