What is Different

Area	DAS	RDS
DB Platform	ADW (recommended) or ATP	ADW
Service Level	SLA determined by Customer and OCI PaaS SLA	TSA, RTO, RPO based on SaaS SLA
Data Schemas	MFCS, SIOCS, CE	MFCS, SIOCS, CE, OB, XO, SE, BC, RICS, RSCH, OM
Database Ownership	Customer provisions and manages the target database.	Oracle provisions and manages an Autonomous Data Warehouse.
Users & Schemas	Customer can create new users/schemas.	Schema set is predefined and immutable. Customers cannot create new users or schemas.
Subscription	PaaS (storage, compute), GoldenGate additional	SaaS (storage, compute), GoldenGate included
Included Tools	APEX, ORDS, SQL Dev Web, SQL Dev Desktop	APEX, ORDS
DB Connection	Web Access, others with supported database connection	Web Access Only, Private Endpoint (additional)
Integration	ORDS, APEX, ADW Adapter, others with supported database connection.	ORDS, APEX, Export/Import through Object Storage
GoldenGate Management	Customer manages GoldenGate replication on the target, including the initial load.	Oracle manages GoldenGate end-to-end, including the initial load and synchronization of source and target.
Object Set	Customers can configure which objects to replicate.	Fixed set of objects replicated; not configurable.
Data Access Model	Tables and views are both exposed.	Only views are exposed, with naming like RDS_WV_<view>. The precise naming convention is cloud service specific but expect the names to differ from those in DAS.
Schema Structure	Replicated data and extensions may coexist in the same schema.	Replicated data and extensions are segregated: read-only application schemas vs. read/write extension schemas. Three auxiliary schemas ( RDS_CUSTOM_1 , RDS_CUSTOM_2 , RDS_CUSTOM_3) are also provided with no default access.
Security & Privileges	Customer controls user accounts, roles, and grants. Security posture varies by implementation.	Oracle defines a static, least-privilege model. Customers have limited security responsibilities. Custom objects are not accessible outside the owning schema unless privileges are explicitly granted.
Move Support	N/A.	Oracle may provide recommendations, but customers are responsible for moving from DAS to RDS.
Capacity Planning	Fully managed by customer.	Oracle manages infrastructure, but customers must monitor storage and CPU consumption and request capacity increases.
Replication Scope & Integration	Customer-owned database can act as a GoldenGate source or target; customers can also integrate other pipelines (ETL, database links, flat files).	RDS cannot be a GoldenGate target or source. External data can be brought in only through Object Store + DBMS_CLOUD, REST services, or OIC with Private Endpoint, and only into the extension schema.
Customer Role	Customers act as both DBA and developer — responsible for patching, backups, replication management, security model.	Customers act primarily as developers. Oracle handles DBA functions: patching, upgrades, replication, backups, security baseline.