SAP AS ABAP Administration · AS ABAP Architecture & Instances

What are the three layers of the SAP three-tier client/server architecture, and what does the split buy you?

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More in AS ABAP Architecture & Instances

You inherit a server whose instance name starts with 'D', so a teammate insists it only runs dialog work. Why is that assumption wrong?

In a multi-instance SAP system, which single component decides which instance is called the 'central instance', and what are all the others called?

A colleague spins up a full SAP NetWeaver AS with the database, application, and presentation all running on one host. What is the only legitimate use for that layout?

In some CRM scenarios with a mobile frontend, SAP inserts a fourth layer into the classic three-tier stack. Where does it sit, and what is it called?

What single architectural fact turns an ordinary SAP system into what SAP calls a 'distributed system'?

Beyond running work processes, what core services does the primary application server (PAS) instance provide that make it mandatory in every AS ABAP system?

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