Migrate database strategy, have two question?

Hello,
I will migrate a huge whole database from serverA (9i db) to server B 10G), will do like this:
1. Export/Import structures
2. Disable constraints and set indexes UNUSABLE (check if 10g can set PK/UK indexes to UNUSABLE state)
3. Direct insert data through db link
4. Rebuild all indexes
5. Enable all constraints
I am not very cleaer about step 2 and step 3, who can give me an explaination how to do like that?
Thank you
Jerry

Why would you import the indexes and constraints in step 1 only to disable them in step 2?
Why are you copying the data across a database link rather than just using export and import?
Define "huge" in terms of database size.
What is your downtime window?
What operating system(s) are being used?
Can you use [transportable tablespaces|http://download.oracle.com/docs/cd/B10501_01/server.920/a96520/transpor.htm#12010] instead?
Justin

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