If you choose to migrate the database by using an existing user schema, the database migration utility creates the ZENworks database but it might fail to migrate the data.
To resolve this issue:
Ensure that the ZENworks tables, views, and user sequence are deleted from the newly created ZENworks database by the database administrator. Later on, clear the user_recyclebin database table.
Start the database migration again by using the same user schema.
To start the migration from an internal Sybase to the Oracle database, see Migrating the Data from the Internal Sybase Database to an Oracle Database. To start the migration from an external Sybase to the Oracle database, see Migrating the Data from the External Sybase Database to an Oracle Database.