Day 2 — SAP HANA Architecture

Explain SAP HANA Architecture.

SAP HANA architecture mainly consists of the following layers: 1. Client Layer Users access SAP HANA through: • SAP GUI • SAP Fiori • SAP BusinessObjects • SAP Analytics Cloud • Third-party applications 2. Application Layer Processes business logic. Examples: • SAP S/4HANA • SAP BW/4HANA • Custom Applications 3. Database Layer This is the heart of SAP HANA. It contains: • In-Memory Engine • SQL Engine • Calculation Engine • Planning Engine • Predictive Engine 4. Persistence Layer Although data is stored in RAM, SAP HANA also saves it to the disk. Purpose: ✔ Prevent data loss ✔ Recovery after power failure 5. Operating System Linux manages memory, CPU, storage and communication.

Customer creates a Sales Order. ↓ Application sends request ↓ HANA processes data in memory ↓ Data is saved to disk automatically ↓ Sales Order created instantly

1. Explain SAP HANA Architecture. 2. What is the Persistence Layer? 3. Why is Linux used? 4. What is the Calculation Engine? 5. Which layer stores data?