Day 4 — SAP Instance

What is an SAP Instance?

• An SAP Instance is a group of SAP services running together. • It contains work processes and shared memory. • Multiple instances can connect to one database. • Each instance has its own profile. • Helps distribute user load. Types of Instances: • Central Instance (CI) • Primary Application Server (PAS) • Additional Application Server (AAS) • Enqueue Replication Server (ERS)

• A company has 3,000 SAP users. • One application server cannot handle all users. • BASIS configures 4 application servers. • Users are distributed among servers using load balancing.

1. What is an SAP Instance? 2. Why are multiple instances used? 3. Difference between PAS and AAS? 4. What is ERS? 5. Can multiple instances share one database?