DFSMStvs application migration guide : June 2003

DFSMStvs application migration guide June 2003

This IBM Redbooks publication will help you to migrate batch VSAM applications to exploit transactional VSAM. DFSMStvs is available in a z/OS environment and offers the ability for VSAM data to be shared for both read and write operations while maintaining integrity and recoverability. DFSNStvs allo...

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Detalles Bibliográficos
Autor Corporativo: International Business Machines Corporation. International Technical Support Organization (-)
Otros Autores: Morton, Nigel (-)
Formato: Libro electrónico
Idioma:Inglés
Publicado: [S.l.] : IBM, International Technical Support Organization 2003.
Edición:1st ed
Colección:IBM redbooks.
Materias:
z/OS.
Virtual storage (Computer science)
CICS (Computer system)
Electronic data processing > Batch processing.
Application software > Development.
Ver en Biblioteca Universitat Ramon Llull:https://discovery.url.edu/permalink/34CSUC_URL/1im36ta/alma991009627154206719
Tabla de Contenidos:
  • Front cover
  • Contents
  • Figures
  • Notices
  • Trademarks
  • Preface
  • The team that wrote this redbook
  • Become a published author
  • Comments welcome
  • Chapter 1. Introduction to DFSMStvs
  • 1.1 VSAM sharing without DFSMStvs
  • 1.1.1 Basic VSAM sharing
  • 1.1.2 MVS scheduler and sharing through MVS system services
  • 1.1.3 Record-level sharing
  • 1.2 DFSMStvs overview
  • 1.2.1 Recoverable data sets and logging
  • 1.2.2 Two-phase commit
  • 1.3 Batch application considerations
  • 1.3.1 Commit frequency
  • 1.3.2 Sharing files beyond today's batch job structure
  • 1.3.3 Unit of recovery
  • 1.3.4 Application restart
  • 1.4 Batch performance observations
  • 1.4.1 Exploiting DFSMStvs with parallel batch programs
  • 1.4.2 Our experiences with parallelizing batch jobs
  • 1.5 Value of DFSMStvs
  • 1.6 Summary
  • Chapter 2. Using commit and backout
  • 2.1 Unit of recovery
  • 2.2 Programming changes
  • 2.2.1 How to commit
  • 2.2.2 How to perform a backout
  • 2.2.3 How often to commit
  • 2.3 Rerunning jobs
  • 2.4 Summary
  • Chapter 3. Transactional recovery
  • 3.1 Batch application restart
  • 3.1.1 Conventional batch job structure
  • 3.1.2 Using DFSMStvs: unique input
  • 3.1.3 Using DFSMStvs: shared input
  • 3.2 Use of forward recovery log
  • 3.3 CICSVR overview
  • 3.4 Summary
  • Chapter 4. Defining VSAM data sets for DFSMStvs
  • 4.1 Recoverable data sets
  • 4.2 IDCAMS definitions
  • 4.2.1 IDCAMS DEFINE CLUSTER parameters
  • 4.2.2 Definition for PL/I example
  • 4.3 Storage management considerations
  • 4.3.1 Data class use
  • 4.3.2 Storage class use
  • 4.3.3 Management class use
  • 4.3.4 Backup while open
  • 4.3.5 Reorganization
  • 4.4 Summary
  • Chapter 5. DFSMStvs environment
  • 5.1 SMS setup
  • 5.1.1 Data class considerations
  • 5.1.2 Storage class considerations
  • 5.2 PARMLIB members
  • 5.2.1 IFAPRDxx
  • 5.2.2 IGDSMSxx.
  • 5.3 Coupling facility definitions
  • 5.3.1 Log stream names
  • 5.3.2 Log streams and log structures
  • 5.4 Summary
  • Chapter 6. Migrating a COBOL program
  • 6.1 The sample program
  • 6.2 Changes to the program
  • 6.3 Step 1: OPEN
  • 6.4 Step 2: Check for deadlocks and time-outs
  • 6.5 Step 3: Add commit and backout logic
  • 6.6 Step 4: Add restart logic and a positioning data set
  • 6.7 Step 5: Remove writes to spool
  • 6.8 Summary
  • Chapter 7. Migrating a PL/I program
  • 7.1 The sample program
  • 7.2 Changes to the program
  • 7.3 Step 1: OPEN
  • 7.4 Step 2: Check for deadlocks and time-outs
  • 7.5 Step 3: Add commit and backout logic
  • 7.6 Step 4: Add restart logic and a positioning data set
  • 7.7 Summary
  • Chapter 8. DFSMStvs experiences
  • 8.1 Console log during normal start
  • 8.2 Exceptions
  • 8.2.1 Committing without DFSMStvs
  • 8.2.2 DFSMStvs server not registered to RRS
  • 8.2.3 Reestablish connection between SMSVSAM and RRS
  • 8.3 Monitoring DFSMStvs
  • 8.3.1 SMSVSAM server connected or not connected to RRS
  • 8.3.2 Display jobs using DFSMStvs
  • 8.3.3 Display a specific cluster and its users
  • 8.3.4 Coupling facility structure utilization
  • 8.3.5 VSAM RLS central locking structure full
  • 8.3.6 Display forward recovery log data sets
  • 8.3.7 RRS failure terminating DFSMStvs
  • 8.3.8 Coupling Facility lock structure
  • 8.4 IDCAMS SHCDS examples
  • 8.4.1 Data set list
  • 8.4.2 Subsystem summary
  • 8.4.3 Data sets by subsystem
  • Appendix A. CICS VSAM recovery (CICSVR) example
  • Appendix B. Example source code
  • Original COBOL program
  • Modified COBOL program
  • Original PL/I program
  • Modified PL/I program
  • Glossary
  • Related publications
  • IBM Redbooks
  • Other publications
  • Online resources
  • How to get IBM Redbooks
  • Help from IBM
  • Index
  • Back cover.

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