ADACVT (Convert a Database from a previous Version)

This document describes the utility "ADACVT".

The following topics are covered:

Functional Overview

The utility ADACVT converts an existing database in place. The conversions performed are described below.

ADACVT enables the conversion of a database in both directions:

  • From a previous version to the current version and;

  • From the current version to a previous version.

When converting a database

  • The nucleus must not be active or;

  • The nucleus must not have an AUTORESTART pending;

  • The nucleus must not have utility entries in the utility control block (UCB).

Prior to converting a database, it is highly recommended that you:

  • Use ADABCK to dump the database;

  • Use ADAVFY'S FIELD and INDEX functions to verify the consistency of the database.

    Note:
    The verification of the database can be done either before or after dumping the database.

The new Adabas version works best if the database is registered in the ADABAS.INI file. If the database is not registered, but a corresponding DBxxx.INI file is available, then ADACVT adds the database into the ADABAS.INI file.

During the conversion, the new structure level and the AUTOSTART option are adapted in ADABAS.INI.

Notes:

  1. In general, a downward conversion is not possible if features introduced with a previous Adabas version are not supported by the target version. Any modifications made using features not supported in the target version must be removed before you attempt the downward conversion. For example, if the spanned record feature is used, ADACVT will not perform a downward conversion of a database to Version 6.6 or below. Similarly, ADACVT will not convert an encrypted database to a version that did not support encryption.
  2. If the RBAC system file is loaded, ADACVT will not perform a downward conversion to Version 6.5 or below. ADACVT will replace the RBAC system file with a loss of user-defined data when converting to the current version.
  3. If you perform a downward conversion of a database that contains collating descriptors created with ICU version 5.4, you must execute ADAINV REINVERT with ADAINV of the target version for these collation descriptors, following successful execution of ADACVT.

This utility is a single-function utility.

Procedure Flow

Procedure Flow ADACVT

Data Set Environment
Variable/
Logical Name 		Storage
Medium 		Additional Information
Associator ASSOx Disk  
Data storage DATAx Disk  
Sort storage SORTx
TEMPLOCx 		Disk Administration Manual, temporary working space
Control statements stdin/
SYS$INPUT 		   
ADAINV messages stdout/
SYS$OUTPUT 		  Messages and Codes
Temporary storage TEMPx Disk  

Checkpoints

On successful completion, ADACVT writes a SYNP checkpoint.

ADACVT Control Parameters

The following control parameters are available:

     M    DBID = number

     M    CONVERT = {target version}

DBID

DBID = number

This parameter selects the database to be converted.

CONVERT

CONVERT = {target version}

This parameter specifies the structure of the destination version. It can take values of the format V<major version number><minor version number>0. For example:

V670

Converts a database from version nn0 to Version 6.7.

or

Vnn0

Converts a database to version nn0.

Note:
In the above description nn is the current version of Adabas; the 1st digit denotes the major version, the 2nd digit the minor version.

Example:

ADACVT DBID=number CONVERT=V700

An attempt is made to convert the database with the DBID = number to Version 7.0.

Restart Considerations

If ADACVT is unable to restart after a crash, restore the original database from the backup and run the utility again.