Chapter B:Hierarchical Model Basic Concepts Tree-Structure Diagrams Data-Retrieval Facility Update Facility Virtual Records Mapping of Hierarchies to Files The IMS Database System Database System Concepts,5th Ed. B.1 @Silberschatz,Korth and SudarshanDatabase System Concepts, 5 B.1 ©Silberschatz, Korth and Sudarshan th Ed. Chapter B: Hierarchical Model Basic Concepts Tree-Structure Diagrams Data-Retrieval Facility Update Facility Virtual Records Mapping of Hierarchies to Files The IMS Database System