Computer Knowledge

Computer Memory and Storage

2,477 Questions

Computer memory and storage questions test foundational knowledge of hardware, cache mapping, and data transfer mechanisms. Key areas include Direct Memory Access, analog recording, and RAID levels. This section is essential for candidates preparing for banking and government computer proficiency tests.

Cache memory mappingDirect memory accessRAID storage levelsHard disk technologyOptical media storageMemory addresses

Computer Memory and Storage Questions

Multiple choice technology programming languages

DFDSS cannot be used to

  1. Reduce DASD free space fragmentation

  2. Copy or move data sets from one DASD device to another or dump

  3. Restore backup copies of entire DASD volumes

  4. Increase File storage
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

DFDSS (Data Facility Data Set Services) is a mainframe utility for DASD management. It can reduce DASD free space fragmentation (A), copy or move datasets between devices (B), and restore backup copies of volumes (C). However, DFDSS cannot increase file storage capacity - storage allocation is managed through SMS and other storage management systems, not DFDSS utilities.

Multiple choice technology programming languages

Which one is not a type of VSAM file?

  1. KSDS

  2. ESDS

  3. RSDS

  4. RRDS
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

To solve this question, the user needs to have knowledge about VSAM files and their types.

Now, let's go through each option and explain why it is right or wrong:

A. KSDS: This option is a type of VSAM file. KSDS stands for Key Sequenced Data Set and is used to store records in a sequential order based on a primary key.

B. ESDS: This option is a type of VSAM file. ESDS stands for Entry Sequenced Data Set and is used to store records in the order in which they are written to the file.

C. RSDS: This option is not a type of VSAM file. RSDS is not a valid acronym for a VSAM file type.

D. RRDS: This option is a type of VSAM file. RRDS stands for Relative Record Data Set and is used to store records based on relative byte positions within the file.

Therefore, the answer is: C

Multiple choice technology programming languages

The DATA option affects whether storage for dynamic data areas and other dynamic runtime storage is obtained from above or below the ------line

  1. (a) 8MB

  2. (b) 31MB

  3. (c) 16MB

  4. (d) 20MB
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

To solve this question, the user needs to understand the concept of dynamic data areas and storage allocation in memory.

The DATA option in this context refers to a compiler option that affects where dynamic data areas and other runtime storage are allocated in memory. The option determines whether this storage is obtained from above or below a certain memory boundary called the "line."

Now, let's go through each option and explain why it is right or wrong:

A. (a) 8MB: This option is incorrect because it specifies a specific amount of memory rather than referring to the memory "line" mentioned in the question.

B. (b) 31MB: This option is incorrect because it specifies a specific amount of memory rather than referring to the memory "line" mentioned in the question.

C. (c) 16MB: This option is correct. The memory "line" referred to in the question is typically located at the 16MB boundary in memory. Therefore, the DATA option affects whether dynamic data areas and other runtime storage are obtained from above or below this 16MB line.

D. (d) 20MB: This option is incorrect because it specifies a specific amount of memory rather than referring to the memory "line" mentioned in the question.

The Answer is: C. (c) 16MB.

Multiple choice technology programming languages

In general which of following type of access is least efficient in VSAM

  1. (1) Sequential Access

  2. (2) Random Access

  3. (3) Dynamic Access

  4. (4) Depends on the datat in the file
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Random access is generally the least efficient access mode in VSAM because it requires searching index structures and performing direct disk I/O operations for non-contiguous records, unlike sequential access.

Multiple choice technology programming languages

The purpose of the REMEMBER statement is to

  1. Store the processing position in a FOR loop.

  2. Store the processing position in a IF loop.

  3. Store the processing information in a FOR loop.

  4. )Remembers your User ID
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The REMEMBER statement in Model 204 stores the current processing position within a FOR loop, allowing you to return to that point later. This is useful for resuming iteration from a saved position rather than starting over.

Multiple choice technology programming languages

GC stands for

  1. Global Cache

  2. Garbage Collector

  3. Generation Code

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

GC stands for Garbage Collector, which is the automatic memory management component in .NET. It automatically allocates and releases memory for objects, handles cleanup of unused resources and helping prevent memory leaks in managed code.

Multiple choice technology operating systems

You are done using your external memory disk (say-KINSTON Pen disk) in Linux and you want to unmount it. But you get an error message like "umount: /media/KINGSTON: device is busy". Which of the following you can use to UNMOUNT IT SAFELY.

  1. Find the process that is using the drive and kill it safely.

  2. option a is correct and the following needs to be done to implement it: fuser /media/KINGSTON;fuser -k /media/KINGSTON; umount /media/KINGSTON

  3. Option a is incorrect and unsafe and you need to hard boot to solve this problem.

  4. Use a force option on unmount to acheive this : umount -F /media/KINSGTON

  5. a and b are correct.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

When a device is busy, you must find and terminate the processes accessing it. Option a describes this strategy, and option b provides the concrete implementation using fuser to identify and kill (-k) those processes before unmounting. Thus, both a and b are correct.

Multiple choice technology mainframe

What does DASD stand for

  1. Data Systems Authorization Directory

  2. Direct Access Storage Device

  3. Data Systems Storage Device

  4. Digital's Attempted Storage Domination
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

DASD (Direct Access Storage Device) refers to storage devices that can directly access any stored data without sequential reading, such as disk drives. In mainframe terminology, DASD specifically refers to disk storage units as opposed to sequential tape storage.

Multiple choice technology operating systems

What information does the major number tell you?

  1. device type

  2. kernel version

  3. filesystem type

  4. filesystem mount point
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In Linux device numbering, the major number identifies the device type and driver to use (e.g., major 3 for IDE hard drives, major 8 for SCSI disks). The minor number identifies the specific device instance (like which partition). When you access /dev/hda, the kernel uses the major number to find the correct driver and the minor number to determine which specific device.

Multiple choice technology mainframe

Data base access in GSAM can be done by

  1. Queries

  2. Function calls

  3. DL/I calls

  4. DL/1 calls
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

GSAM databases are accessed through DL/I (Data Language/I) calls, which is the standard interface language for IMS database systems. Queries and function calls are not the correct access mechanism for GSAM.

Multiple choice technology platforms and products

Which of the following is not true about Isolated storage in Silverlight?

  1. In Silverlight, all I/O operations are restricted to isolated storage and Silverlight applications have no direct access to the file system on client computer

  2. You can use isolated storage in Silverlight to store application settings, which are per-application, per-computer, and per-user settings

  3. Any kind of data can be saved in the isolated store

  4. The default space allocated for isolated storage in 1 MB which can not be increased further
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Isolated storage quota CAN be increased - applications can request more space via the IncreaseQuotaAsync method, subject to user approval. The default 1MB is just the starting allocation. Options A, B, and C correctly describe isolated storage's security isolation and capabilities.

Multiple choice technology operating systems

A VG has PP size of 1GB. Which of the following is true?

  1. The maximum size of any filesystem created in that VG can be of 1GB

  2. The minimum size of any filesystem created in that VG can be of 1GB

  3. PP size of 1GB is not possible.

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

With a 1 GB physical partition size, the smallest filesystem you can allocate occupies at least one PP, i.e., 1 GB. Thus the minimum filesystem size is 1 GB; the maximum can be larger, making the stored answer correct.

Multiple choice technology operating systems

What does lspv do?

  1. List all physical volumes

  2. List all physical partitions

  3. List all logical partitions

  4. List PP size
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

lspv (list physical volumes) is an AIX LVM command that displays all physical volumes in the volume management system. It shows physical volume attributes like size, status, and volume group membership.