How to reduce recusive calls after migration to 9i ?

Hi,
I migrited a db from 8i to 9.2
After migration the database was slow and I found that they
spend very much time on exec recusive calls.
On another server I have the old 8i database for testing.
I start the the same small report on both databases.
The report on 8i was faster then on 9i while the the server the 9i database has more mem and cpu and a greater sga.
Run statspack I found that about 72 minutes of 144 will be executed only for recursive calls.
Are there anyone with simalar problems ?
or can give me some help to tune this 9i db ?
thanks for any info.
regards,
Rainer

Hi,
here are the values:
hash_area_size integer 2048000
hash_join_enabled boolean TRUE
pga_aggregate_target big integer 52428800
workarea_size_policy string AUTO
sort_area_retained_size integer 0
sort_area_size integer 1024000
I migrated from 8i to 9.2.0.5 by runing the migration scripts as described the migration guide folloed by catpatch to install the 9.2.0.5 patch.
regards,
Rainer

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