Migrate a non-CDB to a PDB database

There are several ways to migrate a non-CDB into a CDB:

1. Plug a non-CDB using DBMS_PDB
2. Using Data Pump via TTS or TDB
3. Use GoldenGate

Plug a non-CDB using DBMS_PDB

See Create a PDB from an existing non-CDB Database in Create and configure a PDB.