Learn the MVS command to check contention in an IBM mainframe environment. The D GRS,C command displays contention information and helps identify resource conflicts.
Table of Contents
Question
MVS command to check the contention is
A. D GRS,C
B. D CONT
C. D XCF
D. D C
Answer
The correct MVS command to check contention in a mainframe system is:
A. D GRS,C
Explanation
The D GRS,C command is used to display information about contention in the system. GRS stands for Global Resource Serialization, which is a component of MVS that handles resource sharing and resolves contention between tasks.
When you issue the D GRS,C command, it shows the current contention for global resources. The output includes details such as:
- Resource name
- Jobname and ASID of the task holding the resource
- Jobnames and ASIDs of the tasks waiting for the resource
- Duration the resource has been held
- Type of contention (exclusive or shared)
This information helps identify which tasks are in conflict over resources and what resources are involved. Based on the output, you can take appropriate actions to resolve the contention, such as canceling a job that is holding a resource for too long.
The other options are incorrect because:
- D CONT is not a valid MVS command
- D XCF displays information about the Cross-System Coupling Facility (XCF), not contention
- D C is used to display the console screen, not resource contention
So in summary, D GRS,C is the correct MVS command to check contention between tasks in the system. Analyzing its output is key to identifying and resolving resource conflicts.
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