DFSMStvs overview and planning guide / / [Nigel Morton ... et al.]

• Pubblicazione: San Jose, CA, : IBM, International Technical Support Organization, 2003
• Edizione: 1st ed.
• Descrizione fisica: xviii, 234 p. : ill
• Disciplina: 004.5
• Soggetto topico: Virtual storage (Computer science); CICS (Computer system); Electronic data processing - Batch processing
• Altri autori: MortonNigel
• Note generali: "June 2003."; "SG24-6971-00."
• Nota di bibliografia: Includes bibliographical references (p. 227-228) and index.
• Nota di contenuto: Front cover -- Contents -- Figures -- Notices -- Trademarks -- Preface -- The team that wrote this redbook -- Become a published author -- Comments welcome -- Chapter 1. Introducing DFSMStvs -- 1.1 A brief history of VSAM -- 1.2 Changing business requirements -- 1.2.1 Extending CICS availability -- 1.2.2 Reducing the batch window -- 1.2.3 Web access to VSAM data -- 1.3 Some definitions -- 1.3.1 Backward recovery -- 1.3.2 Forward recovery -- 1.3.3 Atomic updates -- 1.3.4 Unit of work and unit of recovery -- 1.3.5 Two-phase commit -- 1.3.6 In-flight and in-doubt -- 1.3.7 Repeatable read -- 1.3.8 Recoverable data sets -- 1.4 CICS support for recoverable VSAM -- 1.5 VSAM record level sharing introduction -- 1.5.1 RLS new function APARs -- 1.6 DFSMStvs introduction -- 1.6.1 DFSMStvs locking -- 1.6.2 DFSMStvs logging -- 1.6.3 Recovery coordination -- 1.7 Effect on the batch window -- 1.8 Planning for DFSMStvs -- 1.9 Summary -- Chapter 2. What you need for DFSMStvs -- 2.1 Hardware -- 2.2 Software -- 2.2.1 z/OS -- 2.2.2 DFSMS -- 2.2.3 CICS Transaction Server -- 2.2.4 CICS VSAM Recovery -- 2.2.5 Global Resource Serialization -- 2.2.6 z/OS Security Server -- 2.2.7 IMS -- 2.2.8 DB2 -- 2.2.9 Language products -- 2.3 Unsupported VSAM functions -- 2.4 Summary -- Chapter 3. How DFSMStvs works -- 3.1 VSAM RLS and DFSMStvs -- 3.1.1 Sharing VSAM data -- 3.1.2 What is DFSMStvs? -- 3.1.3 What is DFSMStvs mode? -- 3.2 Resource locking -- 3.2.1 Locking concepts -- 3.2.2 Open integrity -- 3.2.3 Share locks and exclusive locks -- 3.2.4 False lock contention -- 3.2.5 Read integrity options -- 3.2.6 Deadlock -- 3.2.7 Retained locks -- 3.2.8 Recovery of lost locks -- 3.3 Resource recovery logging -- 3.3.1 Logging changed data -- 3.3.2 The system logger and DFSMStvs log streams -- 3.3.3 Logging strategy -- 3.3.4 DFSMStvs undo logging and backout. ; 3.3.5 DFSMStvs forward recovery logging -- 3.4 Two-phase commit and backout -- 3.4.1 Resource recovery participants -- 3.4.2 Two-phase commit protocols -- 3.4.3 Commit flow -- 3.4.4 Backout flow -- 3.4.5 Handling of undo records when in-doubt -- 3.4.6 Handling long-running units of recovery -- 3.4.7 Complex application considerations for commit and backout -- 3.4.8 Backout failure -- 3.5 DFSMStvs environment -- 3.5.1 Coupling facility use -- 3.5.2 SMSVSAM address space -- 3.5.3 Sharing control data sets -- 3.5.4 VSAM data sets -- 3.5.5 The system logger -- 3.5.6 Resource Recovery Services -- 3.5.7 CICS TS -- 3.5.8 Batch applications -- 3.6 Summary -- Chapter 4. Batch jobs as transactions -- 4.1 What is a transaction? -- 4.2 Implications of running as a transaction -- 4.3 How often should you commit? -- 4.3.1 Why doesn't DFSMStvs commit automatically? -- 4.3.2 Browsing -- 4.4 How can you avoid deadlocks? -- 4.5 Replacing batch backup steps -- 4.6 What to do when a job fails -- 4.6.1 Job rerun in case of failure -- 4.6.2 Determining the restart point -- 4.7 Unit of recovery isolation -- 4.8 Multi-tasking -- 4.9 Summary -- Chapter 5. Looking for candidates for DFSMStvs -- 5.1 What are the business needs? -- 5.2 What do you want to achieve? -- 5.2.1 Reducing the batch window -- 5.2.2 Eliminating the batch window -- 5.2.3 New applications -- 5.2.4 Vendor applications -- 5.3 What to look for in a batch job -- 5.3.1 Value of scheduling flexibility -- 5.3.2 Degree of VSAM use -- 5.3.3 Read/write profile -- 5.3.4 Pattern of access to data -- 5.3.5 Capable of parallelization -- 5.3.6 Random or sequential access -- 5.3.7 Elapsed time -- 5.3.8 Program structure -- 5.3.9 Database use -- 5.3.10 Functions not supported by DFSMStvs -- 5.3.11 Checklist -- 5.4 Examining batch jobs -- 5.4.1 CICS file resource definitions -- 5.4.2 Operational documentation. ; 5.4.3 JCL scans -- 5.4.4 SMF records -- 5.5 Build a migration plan -- 5.6 Summary -- Chapter 6. Batch application design with DFSMStvs -- 6.1 Application classification -- 6.1.1 DFSMStvs intolerant applications -- 6.1.2 DFSMStvs tolerant applications -- 6.1.3 DFSMStvs exploiting applications -- 6.2 Simple and advanced application models -- 6.3 Designing efficient transactional applications -- 6.3.1 Exclusive control of resources -- 6.3.2 Minimizing contention -- 6.3.3 Transactional isolation -- 6.4 Programming interfaces -- 6.4.1 High-level language considerations -- 6.4.2 Enhancements to the application programming interfaces -- 6.4.3 VSAM macros -- 6.4.4 Opening in DFSMStvs mode -- 6.4.5 Using commit and backout -- 6.4.6 Checking VSAM return codes -- 6.5 How you can avoid reapplying updates -- 6.5.1 Repositioning input files -- 6.5.2 Repositioning output files -- 6.5.3 Generalized subroutines -- 6.6 Other application considerations -- 6.6.1 Read integrity options -- 6.6.2 Applications using non-shared resources -- 6.6.3 Deleting data sets -- 6.6.4 Checkpoint/restart -- 6.6.5 Hiperbatch -- 6.7 Accessing records -- 6.7.1 Maximum record size -- 6.7.2 Browsing -- 6.7.3 Skip-sequential processing -- 6.7.4 Updating records -- 6.7.5 Deleting records -- 6.7.6 Adding records -- 6.8 VSAM restrictions -- 6.8.1 Defer processing -- 6.8.2 Load mode -- 6.8.3 Positioning -- 6.8.4 Locking -- 6.8.5 Sharing -- 6.8.6 SHAREOPTIONS -- 6.8.7 DEFINE parameters -- 6.8.8 Alternate indices -- 6.8.9 GETIX and PUTIX interfaces -- 6.8.10 VSAM exits -- 6.8.11 Request environment -- 6.9 Lock handling -- 6.9.1 Record locking for recoverable data sets -- 6.9.2 Types of locks -- 6.9.3 Lock duration -- 6.9.4 Lock granularity and ownership -- 6.9.5 Intra-unit of recovery lock contention -- 6.10 Deadlocks -- 6.10.1 Deadlock detection -- 6.10.2 Deadlock and time-out. ; 6.10.3 Avoiding deadlocks -- 6.11 Synchronization point processing -- 6.12 Transactional recovery -- 6.12.1 Resource recovery participants -- 6.12.2 Recovery considerations -- 6.12.3 Logging -- 6.12.4 Restrictions on retrying operations -- 6.13 Minimizing errors by design and testing -- 6.14 Summary -- Chapter 7. Planning for DFSMStvs -- 7.1 Coupling facility planning -- 7.1.1 What is a coupling facility? -- 7.1.2 What kind of coupling facility should you use? -- 7.1.3 What is in the coupling facility? -- 7.1.4 Coupling facility storage sizing -- 7.1.5 Coupling facility links -- 7.1.6 CPU planning for the coupling facility -- 7.2 Processor capacity planning -- 7.3 Software configuration planning -- 7.4 System logger planning -- 7.4.1 What is the system logger? -- 7.4.2 Log streams -- 7.4.3 Structures and log streams -- 7.4.4 DASD-only log streams -- 7.4.5 Log stream sizing -- 7.4.6 DASD staging data sets -- 7.4.7 DASD log data sets -- 7.5 VSAM operations planning -- 7.5.1 Recovery procedures -- 7.5.2 Forward recovery operation planning -- 7.5.3 Reorganization -- 7.5.4 Automatic Restart Manager planning -- 7.5.5 What is ARM? -- 7.5.6 ARM benefits -- 7.5.7 ARM exploiters -- 7.5.8 DFSMStvs and ARM -- 7.5.9 Peer recovery -- 7.6 Summary -- Chapter 8. Implementing DFSMStvs -- 8.1 Implementation overview -- 8.2 Setting up a Parallel Sysplex environment -- 8.3 Define coupling facility structures -- 8.4 Define the DFSMS environment -- 8.4.1 Define SMSplex environment -- 8.4.2 Define cache structures in the SMS base configuration -- 8.4.3 Define storage classes for VSAM files -- 8.4.4 Change ACS routines for VSAM data sets -- 8.4.5 Define SMS environment for the system logger -- 8.4.6 Modify SYS1.PARMLIB member IGDSMSxx -- 8.4.7 Modify SYS1.PARMLIB member IFAPRDxx -- 8.5 Define the Sharing Control Data Set (SHCDS) -- 8.6 Define the system logger environment. ; 8.6.1 Define the SMS environment for the system logger -- 8.6.2 Modify SYS1.PARMLIB member IEFSSNxx -- 8.6.3 Define list structures -- 8.6.4 DFSMStvs Define LOGR CDS -- 8.6.5 Modify SYS1.PARMLIB member COUPLExx -- 8.6.6 Define LOGR policy -- 8.7 Define the RRS environment -- 8.7.1 Define RRS log streams -- 8.7.2 Define the RRS start procedure -- 8.7.3 Modify SYS1.PARMLIB member IEFSSNxx -- 8.8 Migrate VSAM files -- 8.9 Plan for fallback -- 8.10 What are the RACF implications? -- 8.10.1 SMSVSAM access to log streams -- 8.10.2 User access to log streams -- 8.10.3 Authority to use IDCAMS SHCDS -- 8.11 Operational procedures -- 8.11.1 DFSMStvs failure -- 8.11.2 DFSMStvs restart -- 8.11.3 Renaming DFSMStvs -- 8.11.4 Data integrity considerations -- 8.12 Summary -- Chapter 9. DFSMStvs performance -- 9.1 Performance effects -- 9.2 Comparison to RLS -- 9.3 Comparison to non-RLS -- 9.4 Sequential performance -- 9.5 Logging performance -- 9.6 Monitoring performance -- 9.7 Tuning DFSMStvs -- 9.8 System-wide recommendations -- 9.9 Summary -- Appendix A. Quiesce protocols -- A.1 Quiesce types -- QUICLOSE -- QUIOPEN -- QUICOPY -- QUICEND -- QUIBWO -- QUIBEND -- QUIFRC -- QUICMP -- QUICA -- Cancelling a quiesce -- Unquiesce processing -- Authority -- Appendix B. Changed commands for DFSMStvs -- B.1 Display SMS -- B.2 VARY SMS -- B.3 SETSMS -- B.4 IDCAMS SHCDS -- Appendix C. RMF Monitor III enhancements -- C.1 Activity by storage class -- C.2 Data set activity -- C.3 LRU statistics -- C.4 Display SMS -- C.5 VARY SMS -- C.6 SETSMS -- C.7 IDCAMS SHCDS -- Glossary -- Abbreviations and acronyms -- Related publications -- IBM Redbooks -- Other publications -- Online resources -- How to get IBM Redbooks -- Help from IBM -- Index -- Back cover.
• Sommario/riassunto: This IBM Redbooks publication describes how DFSMStvs works, how and when you might use it, and what you need to consider in your plans. This book should be of interest to you if you want to understand how you can increase the service hours of a CICS/VSAM system by reducing or eliminating the batch window, or if you want to run multiple concurrent batch jobs updating common VSAM data sets. This book is written for readers who have some knowledge of CICS, VSAM, and VSAM Record Level Sharing, and who wish to understand more about DFSMStvs. The book reviews how existing products work. It introduces DFSMStvs, offering more detail on how it works, how you might migrate to it, and how you can change your applications or write new applications to exploit it. This is a companion volume to the DFSMStvs Application Migration Guide, SG24-6972, which contains practical examples of migrating programs to run in a DFSMStvs environment, and the DFSMStvs Presentation Guide, SG24-6973, which contains an overview presentation of DFSMStvs.
• Titolo autorizzato: DFSMStvs overview and planning guide
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Lingua di pubblicazione: Inglese
• Record Nr.: 9910816213203321
• Lo trovi qui: Univ. Federico II
• Serie: IBM redbooks.