HP OpenVMS Systems Documentation
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Guide to OpenVMS File Applications
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Chapter 10
10 Maintaining Files
     10.1     Viewing File Characteristics
         10.1.1         Performing an Error Check
         10.1.2         Generating a Statistics Report
         10.1.3         Using Interactive Mode
         10.1.4         Examining a Sequential File
         10.1.5         Examining a Relative File
         10.1.6         Examining an Indexed File
     10.2     Generating an FDL File from a Data File
     10.3     Optimizing and Redesigning File Characteristics
         10.3.1         Redesigning an FDL File
         10.3.2         Optimizing a Data File
     10.4     Making a File Contiguous
         10.4.1         Using the Copy Utility
         10.4.2         Using the Convert Utility
         10.4.3         Reclaiming Buckets in Prolog 3 Files
     10.5     Reorganizing a File
     10.6     Making Archive Copies
Appendix A
Appendix A Edit/FDL Utility Optimization Algorithms
     A.1     Allocation
     A.2     Extension Size
     A.3     Bucket Size
     A.4     Global Buffers
     A.5     Index Depth
Glossary
Glossary Glossary
Index
Index
Examples
2-1 Creating a File Containing Collated Keys
4-1 Sample Edit/FDL Utility Session
4-2 Sample FDL File
4-3 Using FDL Routines in a Pascal Program
4-4 Using the FDL$CREATE Routine in a Fortran Program
4-5 Using the FDL$CREATE Routine from a COBOL Program
4-6 Tagging a File
4-7 Accessing a Tagged File
4-8 Using the CONVERT Routines in a Fortran Program
4-9 Using the CONVERT Routines in a COBOL Program
5-1 Using Logical Names for Remote File Access
5-2 Selecting the USEROPEN Option to Call a Routine
5-3 Using the Parse and Search Services
6-1 Rooted-Directory Syntax
7-1 Designing a Pause Between Attempts to Access a Record
9-1 Specifying Run-Time Attributes
9-2 Using the FDL$PARSE and FDL$RELEASE Routines
10-1 Using ANALYZE/RMS_FILE to Create a Check Report
10-2 Using ANALYZE/RMS_FILE to Create a Statistics Report
10-3 Examining a Sequential File
10-4 Examining a Relative File
10-5 Examining an Area Descriptor Path
10-6 Examining a Primary Record
10-7 Examining an Alternate Record
10-8 KEY and ANALYSIS_OF_KEY Sections in an FDL File
Figures
1-1 Files--11 On-Disk Structure Hierarchy
1-2 Single and Multiple File Extents
1-3 Tracks and Cylinders
1-4 DSI and FAT Structures in an XAR
1-5 Interrecord Gaps
1-6 Basic Layout of an ANSI Magnetic Tape Volume
1-7 Single File on a Single Volume
1-8 Single File on Multiple Tape Volumes
1-9 Multifile/Single-Volume Configuration
1-10 Multifile/Multivolume Configuration
1-11 Blocked Fixed-Length Records
1-12 Variable-Length Records
1-13 Using CONVERT to Create a Data File
1-14 Using CREATE/FDL to Create an Empty Data File
2-1 Sequential Access to a Sequential File
2-2 Sequentially Retrieving Records in a Relative File
2-3 Sequentially Storing Records in a Relative File
2-4 Random Access by Relative Record Number
2-5 Random Access by Record File Address
2-6 Comparison of Fixed- and Variable-Length Records
2-7 Writing a VFC Record to a File
2-8 Retrieving a VFC Record
2-9 Sequential File Organization
2-10 Relative File Organization
2-11 Variable-Length Records in Fixed-Length Cells
2-12 Single-Key Indexed File Organization
2-13 Multiple-Key Indexed File Organization
3-1 RMS Index Structure
3-2 Primary Index Structure
3-3 Finding the Record with Key 14
4-1 Line_Plot Graph
4-2 Surface_Plot Graph
4-3 Design Mnemonics
7-1 Shared File Access
7-2 RMS Buffers and the Application Program
7-3 Using Global Buffers for a Shared File
8-1 Using RFA Access to Establish Record Position
10-1 Tree Structure for Sequential Files
10-2 Record Layout and Content for SEQ.DAT
10-3 Tree Structure of Relative Files
10-4 Area Descriptor Path
10-5 Key Descriptor Path
10-6 Structure of Primary Records
10-7 Structure of Alternate Records
10-8 RMS Tuning Cycle
Tables
1-1 Record Access Methods
1-2 Record Formats
1-3 File Structure Options on OpenVMS Systems
1-4 Comparison of ODS-1, ODS-2, and ODS-5
1-5 Files--11 Control Files
1-6 Labels and Components Supported by OpenVMS Systems
2-1 Supported Record Access Modes and File Organizations
2-2 File Organization Characteristics
2-3 Sequential File Organization: Advantages and Disadvantages
2-4 Relative File Organization: Advantages and Disadvantages
2-5 Indexed File Organization: Advantages and Disadvantages
4-1 Summary of the Edit/FDL Utility Commands
4-2 Edit/FDL Utility Scripts
6-1 File Specification Defaults
6-2 Example of Applying Defaults
7-1 File Access Record Operations
7-2 File-Sharing Record Operations
7-3 Initial File Sharing and Subsequent File Access
7-4 Initial File Access and Subsequent File Sharing
7-5 Methods Available for Specifying No Query Record Locking
7-6 Compatibility of Record-Locking Options
8-1 Record Operations and File Organizations
8-2 Search Key Types
8-3 Record Access Stream Context
10-1 ANALYZE/RMS_FILE Command Summary
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