OData at Scale: When to Use CDS Views, RAP, or API Business Hub in Hybrid SAP
Key Takeaways
● CDS (Custom Transactional Services) views for OData exposure, custom RAP-based services, and SAP API Business Hub published APIs present solutions to different problems that, in a mature environment, should be used together rather than one being the default.
● By transaction complexity, we mean RAP for anything beyond CRUD; by consumer type, we mean CDS views for read-heavy Fiori and analytical use; and finally, by governance, we mean API Business Hub for when an external party is involved.
● Select/filter/$batch tuning changes when traffic passes through the Cloud Connector. For a remote BTP extension, metadata caching and the size of $expand responses usually matter more than they do for a Fiori app running alongside the backend.
● With principal propagation through the SAP Cloud Connector and short-lived X.509 certificates, the hybrid setup can apply backend permissions to each end user rather than routing everyone through one shared...
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