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HP OpenVMS Systems Documentation
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Guide to OpenVMS File Applications

Begin Index
Contents (summary)
Preface Preface
Chapter 1 Introduction
Chapter 2 Choosing a File Organization
Chapter 3 Performance Considerations
Chapter 4 Creating and Populating Files
Chapter 5 Locating and Naming Files on Disks
Chapter 6 Advanced Use of File Specifications
Chapter 7 File Sharing and Buffering
Chapter 8 Record Processing
Chapter 9 Run-Time Options
Chapter 10 Maintaining Files
Appendix A Edit/FDL Utility Optimization Algorithms
  Glossary
  Index
  Figures
  Examples
  Tables

Contents

Preface
Preface Preface
Chapter 1
1 Introduction
     1.1     File Concepts
     1.2     Disk Concepts
         1.2.1         Files--11 On-Disk Structure Concepts
         1.2.2         Files--11 Control Files
             1.2.2.1             Index File
             1.2.2.2             Storage Bit Map File
             1.2.2.3             Bad Block File
             1.2.2.4             Master File Directory
             1.2.2.5             Core Image File
             1.2.2.6             Volume Set List File
             1.2.2.7             Continuation File
             1.2.2.8             Backup Log File
             1.2.2.9             Pending Bad Block Log File
             1.2.2.10             Security Profiles File (VAX Only)
         1.2.3         Files--11 On--Disk Structure Level 1 Versus Structure Level 2
         1.2.4         Physical Structures
         1.2.5         CD-ROM Concepts
             1.2.5.1             CD-ROM On-Disc Formats
             1.2.5.2             Volume Structure
             1.2.5.3             Files--11 C/D---ACPs
             1.2.5.4             Using DIGITAL System Identifiers on CD-ROM
     1.3     Magnetic Tape Concepts
         1.3.1         ANSI-Labeled Magnetic Tape
             1.3.1.1             Logical Format of ANSI Magnetic Tape Volumes
             1.3.1.2             RMS Magnetic Tape Ancillary Control Process (MTAACP)
             1.3.1.3             Basic Components of the ANSI Magnetic Tape Format
             1.3.1.4             Volume and File Configurations
             1.3.1.5             Volume Labels
                 1.3.1.5.1                 VOL1 Label
                 1.3.1.5.2                 VOL2 Label
             1.3.1.6             Header Labels
                 1.3.1.6.1                 HDR1 Label
                 1.3.1.6.2                 HDR2 Label
                 1.3.1.6.3                 HDR3 Label
                 1.3.1.6.4                 HDR4 Label
             1.3.1.7             Trailer Labels
     1.4     Using Command Procedures to Perform Routine File and Device Operations
     1.5     Volume Protection
     1.6     RMS (Record Management Services)
         1.6.1         File Definition Language (FDL)
         1.6.2         RMS Data Structures
         1.6.3         Record Management Services
     1.7     RMS Utilities
         1.7.1         The Analyze/RMS_File Utility
         1.7.2         The Convert Utility
         1.7.3         The Convert/Reclaim Utility
         1.7.4         The Create/FDL Utility
         1.7.5         The Edit/FDL Utility
     1.8     Process and System Resources for File Applications
         1.8.1         Memory Requirements
         1.8.2         Process Limits
Chapter 2
2 Choosing a File Organization
     2.1     Record Concepts
         2.1.1         Record Access Modes
             2.1.1.1             Sequential Access
             2.1.1.2             Random Access by Key Value or Relative Record Number
             2.1.1.3             Random Access by Record File Address
         2.1.2         Record Formats
             2.1.2.1             Fixed-Length Record Format
             2.1.2.2             Variable-Length Record Format
             2.1.2.3             Variable-Length with Fixed-Length Control Field (VFC) Record Format
             2.1.2.4             Stream Record Format
     2.2     File Organization Concepts
         2.2.1         Sequential File Organization
         2.2.2         Relative File Organization
         2.2.3         Indexed File Organization
             2.2.3.1             Sequentially Retrieving Indexed Records
             2.2.3.2             Index Keys
             2.2.3.3             Other Key Characteristics
             2.2.3.4             Specifying Sort Order
             2.2.3.5             Using Collated Keys
             2.2.3.6             Summary of Indexed File Organization
Chapter 3
3 Performance Considerations
     3.1     Design Considerations
         3.1.1         Speed
         3.1.2         Space
         3.1.3         Shared Access
         3.1.4         Impact on Applications Design
     3.2     Tuning
         3.2.1         File Design Attributes
             3.2.1.1             Initial File Allocation
             3.2.1.2             Contiguity
             3.2.1.3             Extending a File
                 3.2.1.3.1                 Auto Extend Size Selection
                 3.2.1.3.2                 Establishing Auto Extend Default Quantities
                 3.2.1.3.3                 Placement and Contiguity of Extends
             3.2.1.4             Truncating a File
             3.2.1.5             Units of I/O
             3.2.1.6             Multiple Areas for Indexed Files
             3.2.1.7             Bucket Fill Factor for Indexed Files
         3.2.2         Processing Options
             3.2.2.1             Multiple Buffers
             3.2.2.2             Deferred-Write Processing
             3.2.2.3             Global Buffers
             3.2.2.4             Read-Ahead and Write-Behind Processing
     3.3     Tuning a Sequential File
         3.3.1         Block Span Option
         3.3.2         Multiblock Size Option
         3.3.3         Number of Buffers
         3.3.4         Global Buffer Option
         3.3.5         Read-Ahead and Write-Behind Options
     3.4     Tuning a Relative File
         3.4.1         Bucket Size
         3.4.2         Number of Buffers
         3.4.3         Global Buffer Option
         3.4.4         Deferred-Write Option
     3.5     Tuning an Indexed File
         3.5.1         File Structure
             3.5.1.1             Prologs
             3.5.1.2             Primary Index Structure
             3.5.1.3             Alternate Index Structure
             3.5.1.4             Records
             3.5.1.5             Keys
             3.5.1.6             Areas
         3.5.2         Optimizing File Performance
             3.5.2.1             Bucket Size
             3.5.2.2             Fill Factor
             3.5.2.3             Number of Buffers
             3.5.2.4             Global Buffers
             3.5.2.5             Using the Deferred-Write Option
     3.6     Monitoring RMS Performance
         3.6.1         Enabling RMS Statistics
         3.6.2         Using RMS Statistics
     3.7     Processing in an OpenVMS Cluster Environment
         3.7.1         OpenVMS Cluster Shared Access
             3.7.1.1             Locking Considerations
             3.7.1.2             I/O Considerations
         3.7.2         Performance Recommendations

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