This section describes the operational changes and enhancements provided by Version 7.5.1.
With ATM 7.5, an ATM daemon requires the presence of an Adabas System Coordinator (SYSCO) daemon executing locally under the same Adabas router. The System Coordinator enables multi-systems compatibility, including dynamic transaction routing and Sysplex support, with truly dynamic configuration capabilities. This allows Adabas Transaction Manager to be used very flexibly, across system images, whether Sysplex facilities are used or not. See also section TMNODES Parameter Now Redundant.
For more information, see ATM Daemons and Adabas System Coordinator Groups.
The Adabas Transaction Manager daemon uses database files to store vital recovery information about incomplete transactions, and for other purposes. These files must now reside in the ATM daemon’s own database. There is no longer any need for a separate database to contain these files.
For more information see section Restart and Recovery.
The DTP=ET parameter setting provided with ATM
version 7.4.2 is made redundant because of the full support for Adabas Cluster
Services and Adabas Parallel Services. Where the parameter
DTP=ET has been used, it should be changed to
DTP=RM. For more information, see
Distributed Transaction Support.
Whenever a Resource Manager signs on to an ATM daemon for distributed transaction processing, an ATM124 message, "Signed on for DTP with ATM node nnnnn", is issued, regardless of the order in which the different components were activated. This message is a positive confirmation that the database is enabled as a resource manager.
With Adabas Transaction Manager version 7.5, control over transactions
that cross system boundaries is determined by the scope of the System
Coordinator group with which the application and ATM daemon are associated. A
network of peer ATM daemons is determined by the scope of the associated System
Coordinator group; therefore, the TMNODES parameter
setting provided with earlier versions of ATM is now redundant.
For more information, see ATM Daemons and Adabas System Coordinator Groups.
The default value of the LGRECNO job parameter is
now 0. This minimizes default memory requirements.
For a complete overview of the datasets required by ATM, see the section Required Datasets.
