2. 1 Working With Data Sets Stephen S. Linkin Houston Community College © HCCS and IBM 2008 ©HCCS & IBM® 2008 Stephen Linkin

3. 2 What Is A Data Set?  The Basis For Everything Processed Records Fields

4. ©HCCS & IBM® 2008 Stephen Linkin3 What Is A Data Set?  Organization Sequential Partitioned VSAM

5. ©HCCS & IBM® 2008 Stephen Linkin4 Where Are Data Sets Stored?  Storage Drives and Media Disk (DASD) Tape (Sequential)

6. ©HCCS & IBM® 2008 Stephen Linkin5 What Are Access Methods?  QSAM Queued Sequential Access Method  BSAM Basic Sequential Access Method  BDAM Basic Direct Access Method  BPAM Basic Partitioned Access Method  VSAM Virtual Sequential Access Method

7. ©HCCS & IBM® 2008 Stephen Linkin6  DASD Terminology For UNIX And PC Users Tracks Cylinders How Are DASD Volumes Used?

8. ©HCCS & IBM® 2008 Stephen Linkin7 How Are DASD Volumes Used?  What Are DASD Labels?

9. ©HCCS & IBM® 2008 Stephen Linkin8 Allocating A Data Set  Set Aside Space Access method services TSO ALLOCATE ISPF menus JCL  Establish A Logical Link

10. ©HCCS & IBM® 2008 Stephen Linkin9 How Data Sets Are Named  Unique  Segmented  Characters  Size  Conventions

11. ©HCCS & IBM® 2008 Stephen Linkin10 Allocating Space On DASD Volumes Through JCL  What Will We Do?

12. ©HCCS & IBM® 2008 Stephen Linkin11 Allocating Space On DASD Volumes Through JCL  What will we do? Logical Records And Blocks Data Set Extents

13. ©HCCS & IBM® 2008 Stephen Linkin12 Data Set Record Formats  F – Fixed  FB - Fixed Blocked  V – Variable  VB - Variable Blocked  U - Undefined

14. ©HCCS & IBM® 2008 Stephen Linkin13 Data Set Record Formats  Blocking BLKSIZE LRECL RECFM

15. ©HCCS & IBM® 2008 Stephen Linkin14 Data Set Record Formats  Blocking RECFM=FB LRECL=25 RECFM=VB LRECL=25 USACA SAN JOSE USACA H 0000 H 0011

16. ©HCCS & IBM® 2008 Stephen Linkin15 Types Of Data Sets  What Is A Sequential Data Set? DSORG=PS  What Is A PDS?

17. ©HCCS & IBM® 2008 Stephen Linkin16 Types Of Data Sets  What Is A Sequential Data Set? DSORG=PS  What Is A PDS?  DSORG=PO Why Is A PDS Structured Like That? Advantages Of A PDS

18. ©HCCS & IBM® 2008 Stephen Linkin17 Types Of Data Sets  What Is A Sequential Data Set? DSORG=PS  What Is A PDS?  DSORG=PO Why Is A PDS Structured Like That? Advantages Of A PDS Disadvantages Of A PDS

19. ©HCCS & IBM® 2008 Stephen Linkin18 Types Of Data Sets  What Is A PDSE?

20. ©HCCS & IBM® 2008 Stephen Linkin19 Types Of Data Sets  What Is A PDSE? PDS Versus PDSE

21. ©HCCS & IBM® 2008 Stephen Linkin20 Types Of Data Sets  What Is A PDSE? PDS Versus PDSE  When A Data Set Runs Out Of Space

22. ©HCCS & IBM® 2008 Stephen Linkin21 What Is VSAM?  Data Set Type  Access Method key-sequenced entry-sequenced linear relative record

23. ©HCCS & IBM® 2008 Stephen Linkin22 What Is VSAM?  Control Interval  Code Example

24. ©HCCS & IBM® 2008 Stephen Linkin23  What Is A VTOC? Catalogs And VTOC’s

25. ©HCCS & IBM® 2008 Stephen Linkin24  What Is A VTOC?  What Is A Catalog? Master Catalogs And User Catalogs Catalogs And VTOC’s

26. ©HCCS & IBM® 2008 Stephen Linkin25  What Is A VTOC?  What Is A Catalog? Master Catalogs And User Catalogs Using An Alternate Master Catalog Catalogs And VTOC’s If IBMUSER.A1 is cataloged, then the JCL statement to allocate it to the job would be: //INPUT DD DSN=IBMUSER.A1,DISP=SHR If it is not cataloged, the JCL statement to allocate it to a job is: //INPUT DD DSN=IBMUSER.A1,DISP=SHR,VOL=SER=WRK001,UNIT=3390

27. ©HCCS & IBM® 2008 Stephen Linkin26  What Is A VTOC?  What Is A Catalog? Master Catalogs And User Catalogs Using An Alternate Master Catalog  What Is A Generation Data Group? Catalogs And VTOC’s

28. ©HCCS & IBM® 2008 Stephen Linkin27 Role of DFSMS in managing space  Manual Or Automated Processes  DFSMS Automates Data Set Storage  Data Management Tasks

29. ©HCCS & IBM® 2008 Stephen Linkin28 Role of DFSMS in managing space  Allocates Space On DASD volumes. Automatically Retrieve By Name. Mount Magnetic Tape. Set Logical Connections Between Application Programs And Their Media. Control Data Access. Transfer Data Between Applications And Media

30. ©HCCS & IBM® 2008 Stephen Linkin29 z/OS UNIX File Systems  UNIX File System Is: Hierarchical And Byte-Oriented Paths and Path Names /dir1/dir2/dir3/MyFile

31. ©HCCS & IBM® 2008 Stephen Linkin30 z/OS UNIX File Systems  UNIX File System Is: Hierarchical And Byte-Oriented Paths and Path Names Case Sensitive  z/OS Data Sets Vs File System Files

32. ©HCCS & IBM® 2008 Stephen Linkin31 Working With A zFS File System  DFS™ - Distributed File Service  API - Application Program Interface  SMB - Server Message Block

33. ©HCCS & IBM® 2008 Stephen Linkin32 Summary  Read The Redbook