21. What is SAP HANA XS Engine?
Lightweight app server to run JavaScript/ODATA services.
22. What is XS Advanced (XSA)?
Modern, microservice-based development framework replacing XS Classic.
23. What is SAP HANA Deployment Infrastructure (HDI)?
Container-based runtime for modern HANA development (build, deploy, isolate).
24. What is Persistence Layer?
Ensures durability of data using savepoints and logs.
25. What is a Savepoint?
HANA writes data from memory to disk every 5 minutes for durability.
26. What is a Log File?
Captures all changes to enable recovery in case of crash.
27. Difference between Scale-Up and Scale-Out?
- Scale-Up: Add more RAM/CPU to single node.
- Scale-Out: Add multiple nodes (distributed system).
28. What is Smart Data Access (SDA)?
Virtual access to remote databases without data replication (federation).
29. What is Smart Data Integration (SDI)?
ETL/ELT tool for batch + real-time replication.
30. What is Smart Data Streaming (SDS)?
Real-time event streaming engine for IoT and sensor data.