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Performing the Upgrade - Oracle
Want to upgrade to Oracle Database 10g, but not sure how? Fortunately, there are a number of ways to do it. This article, the second of two parts, describes these methods and guides you as to which one to use, depending on your circumstances. It is excerpted from chapter two of the Oracle Database 10g DBA Handbook, written by Kevin Loney and Bob Bryla (McGraw-Hill/Osborne, 2005; ISBN: 0072231459).
Export the data from the source database using the version of the Export utility specified in the prior section. Perform a consistent export or perform the export when the database is not available for updates during and after the export.
If you have little free space available, you may back up and delete the existing database at this point and then install Oracle Database 10g software and create a target database for the import. If at all possible, maintain the source and target databases concurrently during the upgrade. The only benefit of having only one database on the server at a time is that they can share the same database name.
Install the Oracle Database 10g software and create the target database. In the target database, pre-create the users and tablespaces needed to store the source data. If the source and target databases will coexist on the server, you need to be careful not to overwrite datafiles from one database with datafiles from the other. The Import utility will attempt to execute the create tablespace commands found in the Export dump file, and those commands will include the datafile names from the source database. By default, those commands will fail if the files already exist (although this can be overridden via Importís DESTROY parameter). Pre-create the tablespaces with the proper datafile names to avoid this problem.
You can export specific tablespaces, users, tables, and rows.
Once the database has been prepared, use Import or Data Pump Import to load the data from the Export dump file into the target database. Review the log file for information about objects that did not import successfully.