MIgration from Oracle 9.2.4.0 to Oracle 10g Release 2 (10.2.0.1.0)

Hello
We are planning to upgrade and migrate from Oracle 9 to Oracle 10. ( both version on windows)
Would be of great help if I could avail the below information.
Most of the Instance are more than 50 gig
1 Should use a EXP / IMP or Should use DBUA ( prefer a safe method )
2.IF DBUA used any idea how much time it should take .
3.Any other method for upgrade.
We are currently in an analysis phase , we do have some instance that are already 10g but were created from scratch.
Thanks for all your help in advance
Cheers

Most of the Instance are more than 50 gig
1 Should use a EXP / IMP or Should use DBUA ( prefer
a safe method )Use DBUA , it is safer then exp/imp
2.IF DBUA used any idea how much time it should take
It depend on database , machine etc. it should not take more then 2-3 Hr
3.Any other method for upgrade.
I always use manual method and feel manual upgrade is safest.
All details is given in Oracle Documentation
Oracle Database Upgrade Guide
# Virag Sharma

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