you could probably also use the Database transfer script in Moodle 2.0 (but you would probably be the first to go from mySql to Oracle and might find a few issues)
see:
http://docs.moodle.org/en/Hacking_the_Moodle_2.0_database_transfer_script_to_convert_a_Moodle_1.9_site
General developer forum
Databases: Moodle integrated with Oracle
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