Job processing cycle

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In mainframe operating systems, when a job is submitted, the operating system takes the job through a series of steps known as the job processing cycle. A large number of jobs is usually executed in a given time period, such as night, which is a scheme historically known as batch processing. Regardless of the job stream that a given job will follow, its processing cycle always contains the same sequence of steps: the steps involve in the job processing cycle include:sourceing of the data, arranging the sourced data inorder to avoid erratic or typographic error, inputing the arranged data into the computer for processing, outputing of the processed data inform of information, and lastly is the transmission of the information to where it will be useful. this transmitted information can also serves as a source data for further processing that is why it is called the job processing cycle.

1. Job submission - entering job parameters to the operating system with a scripting language, such as JCL, usually contained in a data set or historically on punch cards
2. Job reading - operating system parses JCL data set
3. Job spooling
4. Job selection
5. Job execution with output spooling - executing actual computer programs included in a job and collecting their output
6. Job output (print or punch)
7. Job purge - All resources associated with the job are released.

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