Vsam file definition in cobol

A job script may be defined as a text file containing job setup information followed by job steps that identify programs to be executed along with parameters unique to the job step. A job script may be created using a text editor. The naming of a job script is determined by the Operating System.

A simple job script may contain a single job step that performs a single function. A typical job script will contain multiple job steps executed in a predefined sequence. The status of each job step may be tested at the end of each job step.

The coding technique is used with the expectation the JCL would be used as a stand alone procedure. The following is the Linux Bash Script file cblvsms1. This section provides additional detail about the CMD files and programs that are used to support this set of sample programs. This provides a single point of definition. The following is a listing of the contents of the command file. CMD command file.

This suite of programs will create various files containing customer data. The customer data is arranged in 80 byte records and the customer number or key is 6 bytes starting in the first position of each record.

This Bash Script file cblvsms8. This document may be used to assist as a tutorial for new programmers or as a quick reference for experienced programmers. In the world of programming there are many ways to solve a problem. This document and the links to other documents are intended to provide a greater awareness of the Data Management and Application Processing alternatives. The documentation and software were developed and tested on systems that are configured for a SIMOTIME environment based on the hardware, operating systems, user requirements and security requirements.

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Note: A SimoTime License is required for the items to be made available on a local system or server. Note: The latest versions of the SimoTime Documents and Program Suites are available on the Internet and may be accessed using the icon. If a user has a SimoTime Enterprise License the Documents and Program Suites may be available on a local server and accessed using the icon. Records can be accessed as sequentially or randomly or dynamically. This relative files faster access compared to other 2 organizations.

But if some of the intermediate records are missing, they occupy space. For any kind of operation against the file inside the program, make sure you use Logical name only i. In JCL Instead, the usual practice is to group a number of consecutive records to form what is known as a physical record or a block the number of records in a block is termed as the blocking factor.

There are two advantages of blocking logical records into a physical record. For example to search for a record file has to read sequentially, if each record is reading from Disk at a time which is time consu- ming in order to speed the access of records, a couple records are read from DISK and keep in intermediate storage called buffer.

For sequential access allocation of large block sizes faster the access. For random access a small block size faster the access of records.

The key position is the offset, relative to zero, of the key from the beginning of the data record. When set to 0, as in this case, the key begins in the first position of the record. The length of the key field is 10 characters.

Following any call to the routine, the return code fields should be tested to determine the success or failure of the processing of the dataset. There are four fields used to return information:. If any action performed on a VSAM dataset results in an error, a value - usually 8 - is returned, and will be placed in this field.

Values in the range of 20 through 28, and are special values indicating conditions signaled by my routine. The values from 20 through 28 indicate inconsistency or error in the parameters. The value is set to indicate end of file was reached performing a sequential read.

I have supplied some condition names in the copy book for frequently expected code values. To write a record into the dataset, the record is populated with data and a call is made to the routine with the WRITE command:. As with the OPEN, following the call to write the record, the condition names associated with the return fields are used to handle error conditions that might arise from the WRITE. After processing of the dataset is concluded, the dataset must be closed by calling the routine with the CLOSE command.

And, as with other calls, the return information should be checked to verify a successful close has occurred. I have attempted to test the functions in the routine using all possible combinations of organization, access method, and access mode with a series of COBOL programs.

The test programs are very simple, using only DISPLAY statements to convey information about the program execution, as I was mostly interested in the functionality of the Assembler routine.