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SAP / SAP Beginner (0 to 2 yrs) Interview questions

What is the database layer in SAP's 3-tier architecture?

The database layer is the bottom tier — where all of the system's persistent data actually lives: master data (customers, materials, vendors), transactional data (sales orders, financial postings), and the system's own configuration and program repository (in the case of ABAP-based systems). The application layer reads from and writes to this layer, but end users never interact with it directly.

//  conceptually: Application Layer issues Open SQL statements
//  that the database layer executes against actual stored tables
SELECT * FROM kna1 WHERE land1 = 'US'.   " ABAP Open SQL, runs against the database layer

Modern SAP systems (S/4HANA) run this layer on SAP's own HANA in-memory database, though classical SAP ERP systems could run on various supported third-party databases (Oracle, SQL Server, DB2, and others), with the same application layer logic working regardless of which specific database was underneath, thanks to Open SQL's database-independent syntax.

What kind of data lives in the database layer?
Do end users typically interact with the database layer directly?

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SAP Mid Level (3 to 8 yrs) Interview questions

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