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saul85 [17]
3 years ago
8

In a relational database model, a(n) _____ operation pares down a table by eliminating columns according to certain criteria. in

sert join find project
Computers and Technology
1 answer:
nikklg [1K]3 years ago
8 0

I guess the correct answer is Project

If thе usеr is intеrеstеd in sеlеcting thе valuеs οf a fеw attributеs, rathеr than sеlеctiοn all attributеs οf thе Tablе (Rеlatiοn), thеn οnе shοuld gο fοr Prοjеct Οpеratiοn.

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Which threading model is best for achieving true parallelism and how?
WITCHER [35]

Answer:

The explantion of this question is given below in the explanation section.              

Explanation:

Parallelism means that an application is split into smaller subtasks that can be processed in parallel on multiple CPU at the same time. Parallelism is related to application handling individual tasks on multiple CPUs. To achieve true parallelism your application must have more than one thread running, schedule the task into other threads, graphics cards, and CPU, etc.  

It is noted that parallelism is a concept while multiple threading in computer programing is its implementation. Some operating systems provide a multiple threading that combined the user-level thread and kernel-level thread facility. In such a system, multiple threads within the same application can run in parallel on multiple CPU or processors

There are three types of Multithreading Model

• Many to many relationships.

• Many to one relationship.

• One to one relationship.

Many to many relationship

This model multiplexes any number of user threads onto an equal or smaller number of kernel threads. However, this model provides the best accuracy to concurrency. However, using this model, true parallelism can be achieved, if the system has multiprocessor.  

Many to One model

This model maps the user-level threads to one kernel-level thread and its management is done in userspace by the thread library. In this model, only one thread can access the Kernal at a time, so multiple threads are unable to run on multiple CPU in parallel.  

One to one relationship

This model provides one to one relationship between the user and kernel-level thread. This model is better than the many-to-one model. It allows another thread to execute when a thread makes a blocking system call. However, it supports multiple threads to execute in parallel on the microprocessor. This model provides true parallelism.  

                                                                  

7 0
2 years ago
What are the differences between a cursor, insertion point and mouse pointer?​
Anna35 [415]

Answer:

Explanation:

A cursor is a pointer which indicates the position of the mouse on a computer's display monitor.

An insertion point is a location in a document where additional information is inserted when the user begins to type.

A mouse pointer is an image used to activate/control certain elements in a GUI (graphical user interface).

I know you asked for the differences, though i thought I'd add a similarity. All of these 3 things are similar, as they show where the position of the info/mouse is. :)

Hope this helps!

-Biscuit08

7 0
2 years ago
Which of the following websites can help you learn about general career trends?
Ber [7]
The answer is vocational information center as this area or website provides a person or a student to explore careers that could be suitable to his or her liking and to show careers or professions' role as they work. This website is a way of educating an individual of having to provide informations regarding about careers.
8 0
3 years ago
What is the difference between algorithm and flowchart​
Tomtit [17]
Flowchart - diagram created by different shapes to show flow of data
algorithm - step by step procedure to solve the problem

A flowchart is a representation of an algorithm
5 0
3 years ago
Any Body have a zoom class goin on<br> i wanna bomb
Norma-Jean [14]

This site is only for education related questions. You should only answer or ask questions. That's what we are here for. Whoever is reading this answer, please spread it to stop people from zooming, hurting others, or just posting non-related to education questions. Thank you.

6 0
2 years ago
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