5.1.3 Flexibility in the Property Graph Schema
The property graph schema design does not use a catalog or centralized repository of any kind. Each property graph is separately stored and managed by a schema of user's choice. A user's schema may have one or more property graphs.
This design provides considerable flexibility to users. For example:
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Users can create additional indexes as desired.
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Different property graphs can have a different set of indexes or compression options for the base tables.
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Different property graphs can have different numbers of hash partitions.
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You can even drop the XSE$ or XDE$ index for a property graph; however, for integrity you should keep the unique constraints.
Parent topic: Property Graph Schema Objects for Oracle Database