JCL – Conditional Processing
The Job Entry System uses two approaches to perform conditional processing in a JCL. When a job completes, a return code is set based on the status of execution. The…
JCL – Procedures
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…
JCL – Base Library
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.…
JCL – DD Statement
Datasets are mainframe files with records organised in a specific format. Datasets are stored on the Direct Access Storage Device (DASD) or Tapes of the mainframe and are basic data…
JCL – EXEC Statement
Each JCL can be made of many job steps. Each job step can execute a program directly or can call a procedure, which in turn executes one or more programs…
JCL – JOB Statement
JOB Statement is the first control statement in a JCL. This gives the identity of the job to the Operating System (OS), in the spool and in the scheduler. The…
JCL – Environment Setup
Installing JCL on Windows/Linux There are many Free Mainframe Emulators available for Windows which can be used to write and learn sample JCLs. One such emulator is Hercules, which can…
JCL – Home
Job Control Language (JCL) is the command language of Multiple Virtual Storage (MVS), which is the commonly used Operating System in the IBM Mainframe computers. JCL identifies the program to…
IMS DB – Recovery
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 DB – Logical Database
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…
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