Materialization is the process of initially populating the replicate database with a copy of the data from the primary database.
Use Replication Agent for DB2 UDB to materialize the target with the DB2 data. The DB2 unload utility produces a data file and a punch-card file that describes the data. You can use these files as input to the materialization feature of Replication Agent for DB2 UDB to initialize the replication target.
See Replication Agent for DB2 UDB User and Troubleshooting Guide > Replication Server Setup > Task 3: Materializing Replicate Tables > Using Replication Agent Materialization.