Nehal D. answered 08/15/22
Expert in Oracle PL/SQL and 15+ Years of Teaching
We can use Oracle Cloud Infrastructure FastConnect or IPSec VPN for private connectivity between your on-premises data center and Oracle Cloud Infrastructure (OCI).
Other way is we can use golden gate tool.
Or We can use any ETL tool like Informatica ,OWB or ODI to extract data from DB2 database and load into Oracle ExaCC db.