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Donald K. Burleson

Oracle Tips  

Oracle MIG utility

1. For small instances (not more that a gig or two) export the Oracle7 database, build the Oracle database and import.

2. For large instances (many gigs), use the MIG facility.

3. For those who like pain, unload all Oracle7 tables into flat files, build the Oracle database using DDL scripts, use SQL loader to reload data. This would also include CTAS and COPY scenarios.

The MIG path of course involves the use of the MIG utility. Oracle has changes to virtually all database structures if you are upgrading from a release prior to 8. These include:

* Datafile file headers
* Data dictionary
* Controlfile structure
* Rollback segment structure

The MIG utility, properly used, ensures that the existing Oracle7 structures are altered to the new Oracle structures. This is a one-way path; once started, the only way to go back to the Oracle7 instance you knew and loved is to recover from the backup or export that you dutifully made prior to starting…right?

Let’s take a more detailed look at the actual procedure to use the MIG utility.

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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