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Donald K. Burleson

Oracle Tips  

Oracle MIG utility

* Performing migration steps out of order. Obviously, don’t do this.

* Not fulfilling the prerequisites for migration (see the first sections above).

* Allowing other users to access the database during migration.

* Database must be at least 7.3.4. I’m not kidding; it checks for this and errors out if it isn’t.

* If you are re-creating control files in a different location, be sure permissions are set properly.

* Be sure all tablespaces were either online or in an offline normal or temporary status when the Oracle8 instance shut down. Be sure there is no outstanding undo in any of the tablespaces.

As stated earlier, Oracle offers numerous new features. It changes the fundamental structures of the database, compared to Oracle8 or earlier versions. The migration to Oracle is not a simple process of shutting down in one version and starting up in the other; it is a complex operation requiring planning (at least for large databases, which must use the MIG or ODMA utilities). However, according to several DBAs who have done it, as long as you plan properly and follow directions, you shouldn’t have any problems.

This is an excerpt by Mike Ault’s book “Oracle Administration & Management”.  If you want more current Oracle tips by Mike Ault, check out his new book “Mike Ault’s Oracle Internals Monitoring & Tuning Scripts” or Ault’s Oracle Scripts Download.




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