IMS DB – DL/I Processing IMS DB stores data at different levels. Data is retrieved and inserted by issuing DL/I calls from an application program. We will discuss about DL/I calls in detail in the upcoming chapters. Data can be processed in the following two ways − Sequential Processing Random Processing Sequential Processing When segments […]
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IMS DB – Cobol Basics We include DL/I calls inside COBOL application program to communicate with IMS database. We use the following DL/I statements in COBOL program to access the database − Entry Statement Goback Statement Call Statement Entry Statement It is used to pass the control from the DL/I to the COBOL program. Here […]
IMS DB – DL/I Terminology Hierarchical databases work on the relationships between two or more segments. The following example shows how segments are related to each other in the IMS database structure. Root Segment Points to note − The segment that lies at the top of the hierarchy is called the root segment. The root […]