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Using DBUA to upgrade three instances of an Oracle database

I am preparing to upgrade from Oracle 8.1.7.4 to 9.2.0.5 on a Windows 2000 platform. I have three instances running on this machine, and the possibility of having to do them one at a time is a real one. My question is, can I just use DBUA to migrate each one at the proper time and let it worry about things like ORACLE_HOME, or is there more to it than that?
DBUA is designed to be the tool of choice for upgrades. You always upgrade a database, not an ORACLE_HOME, so you'll always do these one at a time. Running the DBUA from the 9.2 O_H and choosing the database you wish to upgrade will upgrade just that database. You should have no problems doing them one at a time.

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