Provisioning a Database Schema Service Instance
Once you’ve gained access to your subscription, you need to create—or “provision”—an instance of Oracle Database Cloud Schema Service. This is required before you can create a JCS-SaaS Extension instance.
After the instance is provisioned, not only will the instance appear on your Oracle Cloud Infrastructure Classic Console, but Oracle Cloud will send a confirming email to the administrator address specified in step 4.
See:
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About Oracle Database Cloud - Database Schema Service in Using Oracle Database Cloud — Database Schema Service
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Create a Service Instance in Using Oracle Database Cloud — Database Schema Service