The column definition is adjusted automatically during version 7 to version 8 dictionary migration. The data migration can be performed only after the system has been opened in version 8. You can migrate different tables at different times or multiple tables in parallel. Make sure the migration is done before the version 7 database file limit is exceeded, thereby guarding against the creation of ambiguous block addresses. Data migration by the Migration utility or Oracle Data Migration Assistant applies only to rowids stored in a user-defined column.
Special attention is necessary for all rowids being imported.
Schema Name - specifies the schema name of the table that contains a row whose rowid will be converted to the extended format. Table Name - specifies the table name of the table that contains a row whose rowid will be converted to the extended format. Conversion Type - specifies the type of rowid being converted. It will treat the file number stored in this rowid as the absolute file number, which can cause problems if the file has been dropped and its number has been reused prior to the migration. If the fetched page belongs to a valid table, then the rowid will be converted to an extended format using the Data Object ID of this table, but this conversion is very inefficient, and is only recommended as a last resort, when the target table is not known.