PERT Study Guide with Practice Questions. PERT is a computer adaptive exam. That means that not all test takers will see the same questions, because the computer will show questions of varying levels of difficulty based on the answers to previous questions.
In 1992, SAP released R/3, which represented a switch from mainframe computing to the client-server model, and from a two-tier to a three-tier architecture, in which presentation, applications and data were housed separately. R/3 was a critical product for SAP that launched the company onto the world stage.
This collection of multiple SAP instances and the database make up an SAP system. Thus, an SAP instance is synonymous with one installed component (or âinstallationâ) of SAP on a server (also called a âhostâ). One host can contain multiple SAP instances, too, which belong to different SAP systems.