IMS DB – Data Retrieval The various data retrieval methods used in IMS DL/I calls are as follows − GU Call GN Call Using Command Codes Multiple Processing Let us consider the following IMS database structure to understand the data retrieval function calls − GU Call The fundamentals of GU call are as follows − […]

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 […]

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 […]