Downgrade after 10gR2 migration from 9i

Dear Experts,
What should I do if I want to downgrade a DB from 10gr2 to 9iR2 ?
My "configuration" is the following one:
- I kept COMPATIBLE to 9.2 in the init.ora
- I've got a full cold backup of my DB
I read that downgrading from 10g to any version is "not straight" i.e. a restore of the cold bakcup, services, oracle_home.. is not the right way. This downgrade seems to demand an export/import operation (using the 9i export on the 10g).
- Any experience on that point ?
Other questions regarding migration (9iR2 to 10g):
- Did you keep the old value of the Compatible parameter or did you set it to 10.0 ?
- In both cases (keep old value or set new one) what impacts (or "bad" surprise) did you experiment afterwards (restore of backup...) ?
- What was your motivation to keep it or change it ?
Thanking you in advance for sharing your expertise.
Best Regards,
Guillaume.

Its total database size is 38GB . I want to do a export/import migration.First of all for this size if you prefer using export/import method, performance may be a major problem area during upgrade. You must do your best testing for this migration and after migration database; you might test your application's behavior, most probably optimizer will take the primary intention here -
http://tonguc.wordpress.com/2007/07/16/deffensive-upgrade-methods-but-still-no-pain-no-gain/
Of course you will have your prize soon - http://tonguc.wordpress.com/2007/04/24/take-the-risk-and-migrate-10gr2/
For more information on the upgrade you will experience - Best Practices for Upgrading to Oracle Database 10g Release 2 presentation at OOW - http://www.oracle.com/technology/products/manageability/database/pdf/ow06/best_practices_for_upgrade.pdf
http://www.oracle-base.com/articles/10g/UpgradingTo10g.php
Metalink Note 316889.1 – “Complete checklist for manual upgrades to 10gR2”
Oracle Database Upgrade Guide 10g Release 2 (10.2) documentation
Best regards.

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