Parameters which cannot be overridden in a VSAM file
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File parameters
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Performance parameters
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Space Parameters
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Volume Parameters
Performance parameters like BUFSP (buffer space), STRNO (number of strings), and CISZ (control interval size) are defined during VSAM cluster creation and cannot be overridden during access. These are fundamental to the dataset's physical structure and performance characteristics.
To answer this question, let's go through each option to understand why it is correct or incorrect:
Option A) File parameters - This option is incorrect. File parameters in a VSAM file, such as the file organization, record length, and key length, can be overridden when defining or accessing the file.
Option B) Performance parameters - This option is correct. Performance parameters in a VSAM file, such as the buffer size and caching options, cannot be overridden. These parameters are set at the time of file creation and cannot be changed or overridden later.
Option C) Space parameters - This option is incorrect. Space parameters in a VSAM file, such as the primary and secondary space allocation, can be overridden when defining or accessing the file.
Option D) Volume parameters - This option is incorrect. Volume parameters in a VSAM file, such as the volume serial number and device type, can be overridden when defining or accessing the file.
The correct answer is B) Performance parameters. This option is correct because performance parameters in a VSAM file cannot be overridden.