Use the REST API to add an Oracle Coherence data tier to an existing Oracle Java Cloud Service instance.
If you already provisioned a service instance without configuring a Coherence data tier, you can add a data grid cluster by using the REST API. This functionality is not available in the Oracle Java Cloud Service console.
You can add a Coherence data tier to a service instance if it meets the following requirements:
The Software Edition is High Performance Edition.
The Software Release is Oracle WebLogic Server 12c (12.1.3) or Oracle WebLogic Server 12c (12.2.1).
The service instance does not already include a Coherence data grid cluster.
See Scale Out a Service Instance in REST API for Oracle Java Cloud Service.