If you are planning to migrate to an entirely new server which will have Solaris 10 and Oracle 10gR2 (I would recommend this approach), then how you migrate your database will depend on the size of the database, as well as how long of an outage you have available. To review your options, refer to the Oracle Database 10g Release 2 (10.2) Upgrade Guide. This guide will provide you with prerequisite checks and information, as well as step-by-step information on how to perform the upgrade.
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