Discover the true meaning of address space in mainframe computing. Learn why “the amount of real storage seen by a job” is a common misconception.
Table of Contents
Question
Which of the following is not correct for address space
A. It is the Range of virtual memory assigned for user.
B. it is the amount of Real storage seen by JOB
C. Address space is the range of addresses in real storage.
D. None of these
Answer
B. it is the amount of Real storage seen by JOB
Explanation
An address space in mainframe computing refers to the range of virtual memory addresses assigned to a particular user or job. However, option B, which states that an address space is “the amount of Real storage seen by JOB,” is incorrect and represents a common misconception.
To understand why option B is wrong, it’s essential to differentiate between virtual memory and real storage:
- Virtual memory: This is a memory management technique that allows a computer to compensate for shortages of physical memory by temporarily transferring data from RAM to disk storage. In mainframe computing, an address space represents the range of virtual memory addresses assigned to a user or job.
- Real storage: Also known as physical memory or RAM, real storage refers to the actual hardware memory installed in a computer system. An address space does not represent the amount of real storage seen by a job.
Options A and D are correct statements about address space:
A. “It is the Range of virtual memory assigned for user” accurately describes an address space as a range of virtual memory addresses allocated to a user.
D. “None of these” is also a correct answer since option B is incorrect, and option C, which states that “Address space is the range of addresses in real storage,” is also inaccurate. An address space is a range of virtual memory addresses, not real storage addresses.
In summary, an address space in mainframe computing is the range of virtual memory addresses assigned to a user or job, not the amount of real storage seen by a job. Understanding the difference between virtual memory and real storage is crucial for accurately comprehending the concept of address space.
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