IMS DB – Programming An application program which includes DL/I calls cannot execute directly. Instead, a JCL is required to trigger the IMS DL/I batch module. The batch initialization module in IMS is DFSRRC00. The application program and the DL/I module execute together. The following diagram shows the structure of an application program which includes DL/I calls […]
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IMS DB – Secondary Indexing Secondary Indexing is used when we want to access a database without using the complete concatenated key or when we do not want to use the sequence primary fields. Index Pointer Segment DL/I stores the pointer to segments of the indexed database in a separate database. Index pointer segment is […]
IMS DB – SSA SSA stands for Segment Search Arguments. SSA is used to identify the segment occurrence being accessed. It is an optional parameter. We can include any number of SSAs depending on the requirement. There are two types of SSAs − Unqualified SSA Qualified SSA Unqualified SSA An unqualified SSA provides the name […]