Which Import method is preferrable .....

Hi All,
I want to upgrade my database from 8.1.7 to 10g rel 2.
Can anybody would please tell me that which method is most appropriate and accurate to upgrade the database?
Which method is most efficient to get the optimize solution?
Another issue is our oracle 8.1.7 database is having WE8ISO8859P1 Character Set along with WE8ISO8859P1 National Character Set.
So which Database Character set as well as National Charcter Set would be preferrable against 8i database character set that is mentioned above for database upgradation ???
Regards
Milin

You have two questions which are really unrelated.
As for which method would be most appropriate and accurate to upgrade your database, I would absolutely recommend export/import method over migration (upgrade scripts). I tend to stay away from migration method because of various bugs and other problems. And, you typically will leave obsolete and deprecated features in place when you do a migration (especially from v.8 to higher versions). A couple examples I've seen are continued use of rollback segments, dictionary managed tablespaces, and use of permanent tablespaces for a user's temporary tablespace assignments.
Stay away from migration (using upgrade scripts) unless your database is so large that it is not practical to export/import.
Instead, install all the latest 10g software, patches, CPUs, etc., and then precreate your shell database modeled after your old 8i database. (Obviously don't use rollback segments tablespace, or other deprecated features.)
Then, use your 8i software to export your old database, and then use your 10g software to import your data into the new database (full import). Be sure you precreate all your tablespaces of sufficient size before you do your import.
Hope this helps...
Ji Li
I just read Madrid's response and we obviously have a difference of opinion. While I certainly respect Madrid's postings and opinions, I'd be curious why he favors upgrade (migration) over export/import.
As for the character sets, unless you have a compelling reason to go with unicode, the WE single byte character sets will be fine for quite a while into the future.

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