Modifying and controlling system resources
You establish the initial settings of IMS resources during IMS system definition.
Modifying system resources online
IMS supports two separate functions that support modifying IMS resources online: dynamic resource definition (DRD) and the online change function. Authorized system operators and database administrators (DBAs) can change various system resources using IMS commands.
List of commands with similar functions for multiple resources
These tables show the IMS commands and how they affect certain resources.
Modifying dependent regions
To modify the assignment of classes to regions or to adjust the processing load among message regions, you can use the type-1
/ASSIGN
command or the type-2
UPDATE
command.
Modifying telecommunication lines
To discard response-mode output messages, you can use the
/DEQUEUE
command
How to modify terminals
Terminals and links to terminals can be modified through various type-1 commands. You can use these commands and their variations to manage terminals.
Modifying and controlling transactions
You can use the
/ASSIGN TRAN
or
UPDATE TRAN SET(CPRI(
new_current_priority
))
command to reassign the scheduling priorities established for transactions during system definition. The new assignments remain in effect until the next cold start or until you issue another
/ASSIGN
or
UPDATE
command.
Database control
You can use the type-1
/DBDUMP DB
or type-2
UPDATE DB
commands to control databases and access to databases.
Creating, updating, deleting, and querying resource definitions dynamically
If dynamic resource definition (DRD) is enabled in your IMS system, you can create, update, delete, and query certain IMS resources online through several type-2 commands. You can also create runtime descriptor definitions to use as templates for creating additional resources.
Modifying ETO user IDs and assignments of ISC users
You can use the
/ASSIGN
,
/DISPLAY USER DEADQ
,
/DEQUEUE
, and the
/DISPLAY QCNT MSGAGE
commands to modify various aspects of assignments of ISC users.
Modifying Multiple Systems Coupling resources
After modifying MSC resources, use the
/MSVERIFY
command to ensure that the assignment produced a valid configuration. The
/MSVERIFY
command verifies the consistency of MSC system identifications (SYSIDs) and logical link paths (MSNAMEs) across two systems.
Modifying security options
Commands to modify security options for RACF® are described.
Displaying and terminating conversations
Use the
/DISPLAY CONV
command to show the status of all conversations, held or active. You can terminate a conversation if necessary with the
/EXIT
command, but you should only do this after warning the end user.
Modifying and controlling subsystems
Use the
/CHANGE
command to delete an invalid network identifier (NID). If you need to disconnect from a specific subsystem, use the
/STOP
command. If the
/STOP
command does not work, use the z/OS®
MODIFY
command.
Controlling OTMA input messages
Use the OTMA descriptor, the
/START TMEMBER INPUT
command, or a client-bid protocol message from an OTMA member to set the maximum transaction instance block (TIB) or maximum active input message count for an OTMA member.
Recovery during the IMSRSC repository data set update process
The Repository Server (RS) uses a duplex pair of data sets for each IMSRSC repository, so that the RS can always recover data sets to the last completed and verified write activity.
Parent topic:
Controlling IMS