Accenture Jcl Interview Questions

Download PDF Your requested download is ready! Click

Some of the parameters for the DD statement are listed below. Based on your needs, you can select one or more parameters separated by commas.

1. DSN Parameter: It is used to specify the name of a newly created or existing dataset. There can be a total of 44 characters in the DSN value. The sub-names can be 1 to 8 characters in length, separated by periods.


  • The keyword DSN specifies DSN parameter.
  • Physical dataset name refers to the name of the newly created or existing dataset.
  • 2. DISP Parameter: “DISP” stands for Disposition, a keyword parameter used in JCL to describe a data sets status to OS. Essentially, it indicates how the OS should handle the dataset after JOB/STEP termination. It contains three sub-parameters: status, normal and abnormal termination activities of the JOB.


  • The keyword DISP specifies the Disposition parameter.
  • Status can be NEW (specifies that the dataset is new), OLD (specifies that the dataset exists when the step begins.), MOD (extends the dataset if the dataset already exists or creates a new one if it is not existing.), or SHR (specifies that the dataset can be shared (read access) with other jobs).
  • The normal disposition specifies what is to be done with a dataset after a normal termination. It takes one of the values CATLG, UNCATLG, PASS, KEEP, or DELETE.
  • The abnoram disposition specifies what is to be done with a dataset after a normal termination. It takes one of the values CATLG, UNCATLG, KEEP, DELETE.
  • 3. DCB Parameter: DCB (Data control block) parameter provides information about the physical characteristics of a dataset. For newly created datasets, this parameter is required.


  • The keyword DCB specifies the data control block parameter.
  • List of parameters can be RECFM (specifies record format of the dataset), LRECL (defines the length of logical records), BLKSIZE (defines the size of a block of record), DSORG (specifies the organization of the data set as physical sequential (PS), partitioned (PO), or direct (DA)).
  • 4. SPACE Parameter: The SPACE parameter indicates how much space is required to store a dataset on a Direct Access Storage Disk.


  • The keyword DCB specifies the data control block parameter.
  • The unit of space is specified in Tracks (TRK), Cylinders (CYL), block length (BLKLGTH), record length (RECLGTH).
  • Primary specifies the amount of primary space required in terms of the space unit (tracks/cylinders/number of data blocks)
  • Secondary specifies the secondary quantity of units if the primary is exceeded but allocated only when the dataset expands.
  • The directory specifies the number of directory blocks to be allocated.
  • RLSE specifies releasing the unused space requested.
  • CONTIG specifies to allocate contiguous primary space.
  • ROUND specifies allocation by block length rounded to integral cylinders.
  • 5. SYSOUT Parameter: We have discussed so far the parameters of DD statements that correspond to data stored in datasets. According to the class specified, SYSOUT directs the data to the output device.


    1 What is the significance of using the “//” symbol in JCL?

    It is an important symbol used in JCL statements since every JCL statement must begin with it. JCL statements must satisfy this rule in order to execute properly. Otherwise, the JCL statement will fail. During JCL execution, the system checks for the symbol (//) at the beginning of each statement. This prevents runtime exceptions.


  • // is the identifier of the JCL statement.
  • STEP010 is the name assigned to the job step.
  • PGM specifies program name.
  • PARAM passes input data to the program.
  • 1 How can we convert a FB (Fixed block) file to VB (Variable block) file using a sort program?

    By using the FTOV option in SORT, you can convert a FB file to a VB file. Input records of fixed length are converted to output records of variable length using this parameter. VB files should have 4 extra bytes for RDW (Record Descriptor Word). Accordingly, the length of the record in the VB file is the RDW (4 bytes) + the actual length of the record.


    Here, SORTOUT1 is the VB output file.

    If you input an 80-byte FB file, then the output will be an 84-byte VB file (4 bytes for RDW).

    JCL Interview Questions and Answers | Mainframe | JCL| IBM |

    Related Posts

    Leave a Reply

    Your email address will not be published. Required fields are marked *