When you find yourself needing to perform a character set migration as part of a database upgrade or migration, the Oracle Database Migration Assistant for Unicode (DMU) is a very helpful tool. It will assess your migration needs and help automate the process, all with a very nice GUI front end that makes the whole process easier.
And now comes a really nice enhancement with DMU 2.1: automation of near-zero downtime character set migration! Here is the blurb from the DMU OTN page:
New! Oracle DMU 2.1, released in May 2015, supports a near-zero downtime migration model in conjunction …
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