Dynamic VSAM Control Block Modification During Open Time
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Solution Overview
Problem
Current VSAM tools restrict the ability to modify processing characteristics of VSAM data sets once they are opened, leading to inefficiencies due to static resource allocation and the inability to dynamically adjust to changing system resource availability, requiring costly and time-consuming manual interventions.
Innovation Solution
A system and method for dynamically managing VSAM data processing jobs by allowing modifications to the VSAM control block structure while the data set is open, utilizing a VSAM dynamic address space and service request blocks to adjust job parameters and data set characteristics without suspending or terminating the processing job.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If VSAM data set processing uses static resource allocation at job start, then system stability is maintained, but processing efficiency deteriorates due to inability to adapt to changing system resource availability
Solution Approach 1:
The patent implements dynamic buffer allocation by allowing the VSAM control block structure to be modified during data set open time. The system transitions from static buffer allocation (defined at job start) to dynamic allocation (adjustable during processing), enabling the data processing job to adapt to fluctuating system resource availability without requiring job termination or restart.
Solution Approach 2:
The patent changes the parameter state of buffer allocation from fixed to variable. By modifying the VSAM control block structure during open time, the system allows buffer allocation parameters to be adjusted dynamically based on current system conditions, thereby improving processing efficiency while maintaining system stability.
2Ease of operation
If VSAM tools forbid processing characteristic changes after data set is opened, then system reliability is maintained, but ease of operation deteriorates due to requirement for job suspension and manual intervention
Solution Approach 1:
The patent introduces an intermediary mechanism (dynamic modification of VSAM control block structure) that allows processing characteristics to be changed without directly modifying the open data set. This intermediary approach enables ease of operation by allowing modifications during open time while maintaining system reliability through controlled access and proper synchronization mechanisms.
Solution Approach 2:
The patent segments the VSAM data set structure into modifiable control blocks and immutable data portions. By allowing modifications only to specific control block structures during open time rather than the entire data set, the system achieves ease of operation for parameter changes while maintaining reliability through selective, controlled modifications.
3Adaptability or versatility
If custom modules are developed for dynamically allocated VSAM data sets, then adaptability is improved, but device complexity increases due to requirement for custom code and constant monitoring
Solution Approach 1:
The patent creates a universal solution by extending the standard VSAM control block structure modification capability to dynamically allocated data sets. Instead of requiring custom modules for each data set, the system provides a general mechanism that works across all VSAM data sets, thereby improving adaptability while reducing device complexity through standardization.
Data Source
AI summary
When using virtually stored data sets, such as virtual storage access method (VSAM) data sets, while the data set is open (referred to as an open time) static data set characteristics and/or job parameters have been defined for the VSAM data set. In one approach, even after a data set is opened, a virtually stored control block structure for the data set may be modified, such as by providing a dynamic address space associated with the data set in order to interact with the data set in an environment which allows for a service block request to modify the control block structure, such that data set characteristics and/or job parameters for the data set may be modified during the open time of the data set.