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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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