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
148 Chapter5
TurboIMAGE/XL Library Procedures
DBCONTROL
Mode 14: Allow a privileged mode caller to set BTREEMODE1 option
to ON or OFF and set wildcard character for the database
(permanent). Refer to chapter 11, "B-Tree Indices" for the
qualifier layout.
Mode 15: Enable B-Tree wildcard search for DBFIND mode 1, X and
U types, for the master data set's key item and its
corresponding search items in details, if the key item has a
B-Tree index. In other words, turn on the BTREEMODE1
flag for the current database open. The first byte of the
qualifier is examined. If it is null or blank, then the
current wildcard character is not changed. If it is in the
ASCII range (33...126), then the wildcard character is
changed to that value for the current DBOPEN. If the
qualifier is any other value, DBCONTROL returns an error.
Affects only the current database open. It needs to be done
once per database and remains activated until the
database is closed or the application terminates. This
mode allows you to perform B-Tree searches on ASCII
types without making application changes.
Mode 16: Disable B-Tree wildcard search for DBFIND mode 1
regardless of the existence of a B-Tree index. That is, turn
off the BTREEMODE1 flag for the current database open.
The qualifier is ignored, and BTREEMODE 1 is turned off.
Affects the current database open only. It needs to be done
once per database and remains activated until the
database is closed or the application terminates.
Mode 18: Enables the XM to return a warning when the dynamic
transaction exceeds the 28MB threshold. The maximum
dynamic transaction size of a given process is 32 MB.
However, if a process hit this limit, the process will be
aborted by the transaction manager and the transaction
will be rolled back. In order to give user a chance to save
the transaction, user can call DBCONTROL mode 18
before the transaction started. If the flag set and the
transaction size hit 28 MB, an error will return to the
program. User then can choose either commit the
transaction (call DBXEND) or abort the transaction (call
DBXUNDO). The error number is –1025, which may be
returned by DBDELTE, DBPUT and DBUPDATE.
Mode 19: Disables the XM to return a warning when the dynamic
transaction exceeds the 28MB threshold. Unlike
DBCONTROL mode 18, DBCONTROL mode 19 can be
called within a dynamic transaction.
Mode 20: Allows the program to overwrite the DBUTIL
‘OLDINFOLIMITS’ setting. DBINFO mode 103 returns
data items in a database; DBINFO mode 203 returns data
sets in a database; DBINFO mode 204 returns all data