IMS DB

The JCL Procedures are set of statements inside a JCL grouped together to perform a particular function. Usually, the fixed part of the JCL is coded in a procedure. The varying part…

Base Library is the Partitioned Dataset (PDS), which holds the load modules of the program to be executed in the JCL or the catalogued procedure, which is called in the program.…

The database administrator needs to plan for the database recovery in case of system failures. Failures can be of many types such as application crashes, hardware errors, power failures, etc.…

IMS database has a rule that each segment type can have only one parent. This limits the complexity of the physical database. Many DL/I applications require a complex structure that…

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…

The different data manipulation methods used in IMS DL/I calls are as follows − ISRT CallGet Hold CallsREPL CallDLET Call Let us consider the following IMS database structure to understand…

The various data retrieval methods used in IMS DL/I calls are as follows − GU CallGN CallUsing Command CodesMultiple Processing Let us consider the following IMS database structure to understand…

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…

PCB stands for Program Communication Block. PCB Mask is the second parameter used in the DL/I call. It is declared in the linkage section. Given below is the syntax of…

DL/I function is the first parameter that is used in a DL/I call. This function tells which operation is going to be performed on the IMS database by the IMS…