SAP S/4HANA ABAP Developer

What are the major differences between ECC and S/4HANA from an ABAP perspective? Explain CDS Views and their advantages. What is code pushdown in SAP HANA? Explain AMDP with a real-time use case. What is RAP and why is it important? Explain Managed and Unmanaged RAP. What are Behavior Definitions? Explain OData service development. How do you optimize a report processing millions of records? What are the benefits of CDS Associations? Explain ST05 and SAT usage. What challenges did you face during S/4HANA migration? How do you handle custom code remediation? Explain an interface involving IDoc and APIs. How do MM and SD modules impact ABAP developments? Explain a production issue involving performance degradation. What is ACDOCA and its impact on custom reports? Describe a complex enhancement you implemented. How do you secure custom OData services? Explain a critical support issue you resolved.