TurboIMAGE/XL Database Management System Reference Manual (30391-90012)
Table Of Contents
- 1 Introduction
- 2 Database Structure and Protection
- 3 Defining a Database
- 4 Using the Database
- 5 TurboIMAGE/XL Library Procedures
- Using TurboIMAGE/XL Intrinsics
- DBBEGIN
- DBCLOSE
- DBCONTROL
- DBDELETE
- DBEND
- DBERROR
- DBEXPLAIN
- DBFIND
- DBGET
- DBINFO
- INTRINSIC NUMBER 402
- Syntax
- Parameters
- Discussion
- Mode 101: Item Number
- Mode 102: Item Name
- Mode 103: Items in Database
- Mode 104: Items in Data Set
- Mode 113: BTREEMODE1 and Wildcard Character
- Mode 201: Set Number
- Mode 202: Set Name
- Mode 203: Sets in Database
- Mode 204: Sets with Item
- Mode 205: Set Capacity
- Mode 206: Number of Data Set Chunks
- Mode 207: Size of Data Set Chunks
- Mode 208: Primary and Actual Capacity
- Mode 209: B-Tree Attachment
- Mode 301: Paths
- Mode 302: Key or Search Item
- Mode 401: Logging
- Mode 402: ILR
- Mode 403: Dynamic Roll-Back
- Mode 404: Logging Subsystem Information
- Mode 406: Database Information
- Mode 501: Subsystem Access
- Mode 502: Critical Item Update
- Modes 8nn: Third-Party Indexing
- Mode 901: Language
- DBLOCK
- DBMEMO
- DBOPEN
- DBPUT
- DBUNLOCK
- DBUPDATE
- DBXBEGIN
- DBXEND
- DBXUNDO
- 6 Host Language Access
- Model Program
- ORDERS Database Model Program
- Main Body of Program
- Opening the Database
- Retrieving All the Records on a Chain (with Item Level Locking)
- Retrieving a Data Entry Using a Record Number
- Retrieving Master Data Using a Key Value
- Retrieving Data Serially (with Set Level Locking)
- Adding an Entry
- Updating an Entry
- Deleting an Entry
- Rewinding a Data Set
- Obtaining Database Information
- Obtaining Error Messages and Explanations
- Closing the Database
- C
- COBOL II
- Defining Data Types, Variables, and Intrinsics
- Main Body of Program
- Opening the Database
- Retrieving All the Records on a Chain (with Item Level Locking)
- Retrieving a Data Entry Using a Record Number
- Retrieving Master Data Using a Key Value
- Retrieving Data Serially (with Set Level Locking)
- Adding an Entry
- Updating an Entry
- Deleting an Entry
- Rewinding a Data Set
- Obtaining Database Information
- Obtaining Error Messages and Explanations
- Closing the Database
- FORTRAN 77
- Pascal
- RPG
- 7 Logging and Recovery
- Database Utilities Used in Logging and Recovery
- Recovery Options
- Logical Transactions
- Dynamic Roll-Back Recovery
- Intrinsic Level Recovery
- Logging Preparation
- Step 1--Checking MPE/iX Logging Configuration
- Step 2--Acquiring Logging Capability
- Step 3--Logging to Tape or Disk
- Step 4--Building a Log File for Logging to Disk
- Step 5--Creating the Log Identifier
- Step 6--Setting the Log Identifier
- Step 7--Setting Flags for the Database Backup Copy
- Step 8--Making a Database Backup Copy
- TurboSTORE/iX 7x24 True-Online Backup
- Logging Status
- Logging Maintenance
- Roll-Forward Recovery
- Roll-Back Recovery
- DBRECOV Commands Used with Roll-Forward and Roll-Back Recovery
- Recovery Tables
- Post-Recovery Options
- The Mirror Database
- 8 Using the Database Utilities
- Restructuring the Database with TurboIMAGE/XL Utilities
- Summary of Utility Routines
- Utility Program Operation
- DBLOAD
- DBRECOV
- >CONTROL
- >EXIT
- >FILE
- >RECOVER
- >ROLLBACK
- >RUN
- DBRESTOR
- DBSTORE
- DBUNLOAD
- DBUTIL
- >>ACTIVATE
- >>ADDINDEX
- >>CREATE
- >>DEACTIVATE
- >>DETACH
- >>DISABLE
- >>DROPINDEX
- >>ENABLE
- >>ERASE
- >>EXIT
- >>HELP
- >>MOVE
- >>PURGE
- >>REBUILDINDEX
- >>REDO
- >>RELEASE
- >>SECURE
- >>SET
- >>SHOW
- Syntax
- Parameters
- Example (Show Users)
- Example Discussion
- Example (Show All)
- Example Discussion
- Example (Show Capacity)
- Format of Show Device List
- Example (Show Device)
- Format of Show Indices
- Example (Show Indices)
- Format of Show Locks List
- Example 1 (Show Locks)
- Example 1 Discussion
- Example 2 (Show Locks)
- Example 2 Discussion
- >>VERIFY
- 9 Using a Remote Database
- 10 Internal Structures and Techniques
- 11 B-Tree Indices
- A Error Messages
- B Results of Multiple Access
- C Database Design Considerations
- D Multiple Calls to DBLOCK
- E TurboIMAGE/XL Log Record Formats
- F MPE/iX Log Record Formats
- G Recovery and Logging Quick Reference
- H TurboIMAGE/XL versus TurboIMAGE/V
310 Chapter7
Logging and Recovery
Database Utilities Used in Logging and Recovery
Database Utilities Used in Logging and Recovery
The TurboIMAGE/XL database is maintained using various TurboIMAGE/XL database
utilities which are fully described in chapter 8. Because the following database utilities are
used in logging and recovery, they are also referred to in this chapter:
DBUTIL Creates and maintains the database.
DBUNLOAD Copies data to specially formatted tape volumes.
DBLOAD Loads data from backup volumes (DBUNLOAD tape) into the database.
DBSTORE Stores a database to tape. You may also use TurboSTORE/iX 7x24
True-Online Backup with ONLINE=START or ONLINE=END option.
DBRESTOR Restores a database from backup volumes (DBSTORE tape) to disk.
If you use TurboSTORE/iX 7x24 True-Online Backup with
ONLINE=STARTor ONLINE=END option to store your database, you can
use the MPE RESTORE command which invokes TurboSTORE/iX 7x24
True-Online Backup to restore the database.
DBRECOV Recovers a database from a log file, even when you used TurboSTORE/iX
7x24 True-Online Backup with ONLINE=START or ONLINE=END
option to store the database. The DBRECOV utility allows you to set control
commands and create individual user recovery files. The information from
these files enables you to inform each user where to resume transactions
within the database.
Database utilities can be run in either job or session mode. With the exception of the
DBUTIL >>SHOW command, the utilities DBUTIL, DBSTORE, DBRESTOR, DBUNLOAD, and
DBLOAD all require a logon in the group and account that contains the database root file.
Consequently, these utilities cannot be used with a remote database unless you initiate a
remote session and run the utility as part of that session. The DBUTIL, DBSTORE, and
DBRESTOR utilities do not allow you to use the MPE/iX FILE command to equate a
database or database-access file.
CAUTION
DBUNLOAD and DBLOAD do allow MPE/iX FILE commands to equate a database
and can redirect the database to a different file. Except in a controlled
environment, you should not use the MPE/iX FILE command to redirect a
database or database-access file to a different file because that file can be
purged easily.
The DBRECOV utility is not included in the discussion above because it is an exception. With
DBRECOV, MPE/iX FILE commands are permissible and do not require a logon to the same
group and account as the log file. However, DBRECOV must be invoked on the system where
the database resides.
You can operate the database utilities if you are the database creator or if you know the
maintenance word. If no maintenance word is defined, only the database creator can
execute the database utilities. The exception to this rule is that a user with system