Computer Knowledge

Computer Memory and Storage

2,121 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

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

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.

Multiple choice technology programming languages

Which memory component contains data and control information for a server process ?

  1. Progran Global Area

  2. System Global Area

  3. Shared Pool Area

  4. Database Buffer Cache
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Program Global Area (PGA) is a memory region that contains data and control information for a single server process. It is non-shared memory specific to each process, unlike the SGA which is shared across all processes. The PGA contains session-specific variables, sort areas, and other process-private data.

Multiple choice technology mainframe

The physical storage used in Z/OS is

  1. Internal storage or real storage or central storage or processor storage

  2. External storage or paging storage or auxiliary storage

  3. Virtual storage

  4. All
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

z/OS storage architecture distinguishes between internal (central/real/processor) storage directly accessed by the CPU, and external (paging/auxiliary) storage used as overflow. Virtual storage is an address space concept, not a physical storage type.

Multiple choice technology mainframe

Which one of the following is true about Central and Auxiliary storage in Z/OS

  1. Central storage is accessed asynchronously with the processor and Auxiliary storage is accessed synchronously

  2. Central storage is accessed synchronously with the processor and Auxiliary storage is accessed asynchronously

  3. Both Central storage and Auxiliary storage is accessed asynchronously with the processor

  4. Both Central storage and Auxiliary storage is accessed synchronously with the processor
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Central (real) storage is directly connected to the processor and accessed synchronously at CPU speeds. Auxiliary storage acts as secondary storage and is accessed asynchronously because it requires I/O operations that take much longer than CPU cycles.