1 Batch Processing And JES Stephen S. Linkin Houston Community College © HCCS and IBM 200 ©HCCS & IBM® 2008 Stephen Linkin

2 What is batch processing?  Card Decks  Herman Hollerith Computing Tabulating Recording Company AKA American Tabulating Machine IBM  JCL Key  Limited If Any Human Intervention

©HCCS & IBM® 2008 Stephen Linkin3 What is JES?  A Job Entry Subsystem Manages I/O Job Queues And Data.  Receiving Jobs Into The O/S  Schedule For Processing  Controlling Output Processing Spooling

©HCCS & IBM® 2008 Stephen Linkin4 What is JES?  A Job Entry Subsystem  JES2 And JES3 Accept Jobs Submitted In Various Ways:  ISPF Using SUBMIT Command  Over A Network  From A Running Program  From A Card Reader JES Uses Disk Data Sets For SPOOLING

©HCCS & IBM® 2008 Stephen Linkin5 What is JES?  Basic Elements Of Batch Processing

©HCCS & IBM® 2008 Stephen Linkin6 What does an initiator do?  Run Multiple Jobs Asynchronously Interprets JCL Traffic Control

©HCCS & IBM® 2008 Stephen Linkin7 Job And Output Management With JES And Initiators  Batch job Scenario 1  Batch job Scenario 2

©HCCS & IBM® 2008 Stephen Linkin8 Job And Output Management With JES And Initiators  Batch job Scenario 1 Example 7.1 Example 7.2  Batch job Scenario 2

©HCCS & IBM® 2008 Stephen Linkin9 Job And Output Management With JES And Initiators

©HCCS & IBM® 2008 Stephen Linkin10 Job And Output Management With JES And Initiators

©HCCS & IBM® 2008 Stephen Linkin11 Job flow through the system  Input  Conversion

©HCCS & IBM® 2008 Stephen Linkin12 Job flow through the system  Input  Conversion  Processing  Output  Print/punch (hard copy)

©HCCS & IBM® 2008 Stephen Linkin13 Job flow through the system  Input  Conversion  Processing  Output  Print/punch (hard copy)  Purge

©HCCS & IBM® 2008 Stephen Linkin14 JES2 compared to JES3

©HCCS & IBM® 2008 Stephen Linkin15 Summary  Read The Redbook