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The SDB 12.1 delivered instance must be created using SDB Setup wizard.exe. This will act as the source database for the merge process. For instructions on creating a delivered instance of the SDB, see Create SDB Database using SDB Setup Wizard.
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If multiple Oracle homes exists on the DB server, Oracle 18c home must be present before other Oracle homes in the path environmental variable.
Migration to SDB 12.1 is irreversible, so a full database backup is strongly recommended before starting the migration process.