Why can we have at most one primary or clustering index on a file, but several secondary indexes?

Answers

Answer 1

The reason is that there is only one physical way in which the actual data may be structured. A secondary index is a distinct data structure with references to the rest of the data that is arranged around its own keys.

Index structures are used in databases to create an index with identifiers and pointers to the blocks so we can access the block directly or limit the number of blocks that need to be searched, hence reducing the number of block accesses. The key values are the values in the column. The retrieval performance of the table will be enhanced by creating an index for each column that will serve as the foundation for table retrievals.

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Related Questions

The purpose of testing a program with different combinations of data is to expose run-time and.

Answers

The goal of testing a schedule with different combinations of data is to tell run-time and errors.

Where is the data on the computer?A variable's data type and the kinds of mathematical, relational, and logical operations that can be performed on it without producing an error are classified as data types in programming. Integral, Floating Point, Character, Character String, and Composite types are the five basic kinds of data types that are recognized by the majority of current computer languages. Each broad category also includes several particular subtypes. A datum is a single symbol of data, whereas data is any sequence of one or more symbols. Information is derived from data through interpretation. Data that is represented digitally instead of analogically uses the ones-and-zeros binary number system.

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Which position is most easily outsourced? group of answer choices
a. marriage counselor
b. website designer
c. small animal veterinarian
d. high school chemistry teacher
e. tow truck operator

Answers

A website designer is a place that is most easily outsourced. Web designers create, build, and code many websites and online pages that combine text with music, images, graphics, and video clips.

What is the role of a website designer?Web designers create, build, and code many websites and online pages that combine text with music, images, graphics, and video clips. A web designer is responsible for the layout and design of a website or web page.It also refers to creating a new website or making updates to an existing one. Putting the website's design to the test and improving it. establishing best practices, standards, and design principles. maintaining website look by applying content guidelines. designing visual content for websites and making sure it adheres to client branding. In the field of computer systems design and related services, certain web developers and digital designers are employed.

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Using the celsius_to_kelvin function as a guide, create a new function, changing the name to kelvin_to_celsius, and modifying the function accordingly. sample output with input: 283.15

Answers

Replace '''Your solution goes here''' with:

def kelvin_to_celsius(value_kelvin):

   value_celsius = 0.0

   value_celsius = value_kelvin - 273.15

   return value_celsius

This line defines the function

def kelvin_to_celsius(value_kelvin):

This line initializes value_celcius to 0.0

   value_celsius = 0.0

This line calculates the equivalent of value_kelvin

   value_celsius = value_kelvin - 273.15

This returns the equivalent value_celsius

   return value_celsius

When the Celsius temperature is unsatisfactory and a large quantity is needed, we do convert C to K. T (K) = T (°C) + 273.15 can be used to convert between the two temperatures using the Celsius to Kelvin formula.

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Key history of computers

Answers

Explanation:

The history of computers starts out about 2000 years ago in Babylonia (Mesopotamia), at the birth of the abacus, a wooden rack holding two horizontal wires with beads strung on them. Blaise Pascal is usually credited for building the first digital computer in 1642.

The difference(s) between using telnet and ssh to remotely access a switch's cli is/are?

Answers

Telnet and SSH are different in that SSH employs encryption, which prevents eavesdropping on any data being transmitted over the network.

In order to decode and read the data being transmitted between the client and server, it is exceedingly tough for hackers. The open-source network protocol known as SSH, or Secure Shell, is used to access and manage devices remotely through a program. It enables you to log into a distant system through a network and issue commands to that system.

A user can connect to a system remotely using the command line using the TCP/IP protocol known as Telnet, which stands for Telecommunications and Networks. Telnet makes a remote system appear to be a local system.

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Use the function varimp() on the output of train() and save it to an object called:__________

Answers

Use the function varimp() on the output of train() and save it to an object called imp

What is a Function?

This refers to the block of organized code that is used repeatedly to perform some tasks.

Hence, we can see that if we Use the function varimp() on the output of train() and save it to an object called imp.

This is because the function name is "varimp()" and therefore, the location where the output would be saved would be named as imp so it can be accessed faster.

The imp is the menoray location where the data would be saved for future use..

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A computer screen renders an image by using a grid of red, green, and blue lights.
One set of such lights is known as a(n) ___

Answers

Answer:

RGB

Explanation:

RGB is also the term referring to a type of component video signal used in the video electronics industry. It consists of three signals—red, green, and blue—carried on three separate cables/pins. RGB signal formats are often based on modified versions of the RS-170 and RS-343 standards for monochrome video.

What is the output of the following code segment? n = 1; while (n <= 5) cout << n << ' '; n ;

Answers

The output of the code segment n = 1; while (n <= 5) cout << n << ' '; n ; is B) 1 1 1... and on forever.

A text segment is one of the sections of a programme in an object file or in memory that includes executable instructions. It is sometimes referred to as a code segment or simply as text.

Oh, and to answer your question, ". data/. code and data segment/code segment directives" are not significantly different from one another. The only distinction that comes to mind is that with code segment, segments must be closed, whereas with. code, segments need not be closed.

This designates the location in memory where the instruction codes are kept. This section is also fixed. Data values provided to software functions and procedures are stored in the stack segment.

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What is the task of the system software’s utilities?

Answers

Answer: Its used to list of change information relating to data sets an volume.

Explanation:

Answer:

utility software help users configure,analyse,optimise and maintain a computer

4) Which of the following computers is the fast and expensive computer? a) Mini Computer b) Super Computer c) Main frame d) desktop computer​

Answers

Answer: Supercomputers are the computers which are the fastest and they are also very expensive

Answer:

Super Computer

Explanation:

Which type of evidence is not used by the auditor to obtain an understanding of the design and implementation of internal control?

Answers

The auditor does not use confirmation as a sort of evidence to understand how internal controls were designed and implemented.

All information used by the auditor to draw the findings on which the auditor's opinion is based, whether it came from audit processes or other sources, is referred to as audit evidence. Material that both validates and corroborates management's claims about the financial statements or internal control over financial reporting, as well as information that refutes such claims, make up audit evidence.

The auditor's goal is to organize and carry out the audit in order to gather adequate audit evidence to back up the conclusion made in the auditor's report.

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What are the important points
concerning critical thinking?
(Select all that apply.)

You need to practice the right skills.
You can learn it quickly.
You should use your feelings.
You must evaluate information.
You need to be unbiased and unemotiona
You need to use logic and reason.
You need to be well-spoken.

Answers

The  important points to note concerning critical thinking are:

You must evaluate information.You need to be unbiased and unemotional.You need to use logic and reason.You need to be well-spoken.

What value do critical thinking abilities have?

People that use critical thinking are more able to understand their own objectives, motives, as well as self.

You can alter your circumstances, foster personal development, as well as increase your level of general satisfaction when you can derive knowledge to identify the most crucial components and apply those to your life.

Therefore, based on the above, one can say that the options d, e, f, and g selected are correct.

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Which type of operating system is most likely to require a touchscreen in order to issue commands?

server

GUI

mobile

CLI

Answers

A type of operating system which is most likely to require a touchscreen in order to issue commands is: mobile.

What is an operating system?

In Computer technology, an operating system (OS) can be defined as a system software that's usually pre-installed on a computing device by the manufacturers, in order to manage random access memory (RAM), software programs, computer hardware and all user processes.

The types of operating systems.

There are different types of operating systems (OS) used for specific purposes and these are;

Real Time operating system (OS) .Distributed operating system (OS).Single User operating system (OS).Batch operating system (OS)Multitasking/Time Sharing operating system (OS).Multiprocessing operating system (OS).Network operating system (OS).Mobile operating system (OS).

In conclusion, a mobile operating system (OS) is commonly designed and developed with a touchscreen in order to enable end users issue commands.

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After processing, the computer sends the _____ to one or more devices, such as a monitor or printer.

Answers

After processing, the computer sends the output to one or more devices, such as a monitor or printer.

Output is the result of processing the data entered into the computer to information that can be sent out from the computer by a monitor, printer, or any other device.

Input can be described as the raw data which is supplied to the computer for processing and obtaining information and can be done by various devices such as keyboards or mice. The raw data of the input is transformed into useful information which is generally done by the CPU. This processed data or information is called output which can be used in the present condition or for further processing with additional data.

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Keyboard shortcut for the following
Undo-
Find-
Cut-
Paste-
Save-
Open-​

Answers

Answer:

undo- ctrl+ z

find- ctrl + F and ctrl G

Cut- ctrl + x

Paste- Crtl + v

Save- Crtl S

Open - Crtl P + Crtl K

Explanation:

Answer:

and

Explanation:

Undo-(Ctrl + Z)

Find-(Ctrl + F)

Cut-(Ctrl + X)

Paste-(Ctrl + V)

Save-(Ctrl + S)

Open-(Ctrl + O)

When transitioning to a customer-management strategy, the ___________ department must finance new programs and technology that will help build learning relationships with customers.

Answers

The department must invest in new initiatives and equipment to support the development of collaborative connections with customers as it makes the switch to a customer-management strategy.

What is CRM?Customer relationship management, a technique used by businesses and other organizations to manage their connections with customers, frequently entails evaluating a large amount of data through data analysis. All communications and relationships between your company's customers are managed using a program called customer relationship management (CRM). The three distinct categories of CRM systems are operational, analytical, and collaborative. Businesses use a variety of techniques, plans, and tools together referred to as customer relationship management (CRM) in order to manage and examine client interactions and data throughout the customer lifecycle (CRM). In order to optimize client retention and boost sales, it is important to improve interactions with customers.

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What level of output does the monopolist have to produce in order for the entrant to face the residual demand curve, dr?

Answers

In a situation where a monopolist is said to encounter entry from a new competitor, the rate of output the monopolist is one that tends to make in order for the tool to face the residual demand curve (DR) and this is one that is known to be determined by the point where the DR curve passes the monopolist's marginal cost (MC) curve.

What is the monopolist  about?

A monopolistic output has no competition, meaning the monopolist controls the cost and amount requested. The level of yield that maximizes a monopoly's benefit is when the negligible taken a toll rises to the minimal income.

The monopolist will select the profit-maximizing level of yield where MR = MC, and after that charge the cost for that amount of yield as decided by the showcase request bend. In case that cost is over normal taken a toll, the monopolist gains positive benefits.

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In a linear programming problem, the objective function and the constraints must be linear functions of the decision variables. True or false?.

Answers

It is true that the objective function and the restrictions in a linear programming problem must be linear functions of the choice variables.

When the needs of a mathematical model are represented by linear relationships, the optimal result can be obtained using a technique known as linear programming (LP), sometimes known as linear optimization. A particular type of mathematical programming is linear programming.

Formally speaking, linear programming is a method for optimizing a linear objective function under the restrictions of linear equality and linear inequality. Convex polytopes, a set defined as the intersection of a finite number of half spaces, each of which is determined by a linear inequality, make up its viable region.

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With ________, statistical techniques can identify groups of entities that have similar characteristics

Answers

With cluster analysis, statistical techniques can identify groups of entities that have similar characteristics.

Cluster analysis is based on the idea of grouping the observations such that all members of a group are similar to one another and at the same time they are distinctly different from all members outside of this group. When the data is ready, such that it does not have any missing values, you must decide on what metric is appropriate to capture the similarity between your observations using the features that you have. Then you can use a clustering method to group your observations into clusters based on the similar characteristics they possess.

Clustering analysis is of two types, hard clustering, and soft clustering. The two differ in that in hard clustering each data set has to be placed in not more than one of the total clusters while in soft clustering a data set can be placed in more than one of the total clusters.

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What setting in a local dns server allows it to query an isp dns server on behalf of the host? question 30 options:
a. recursive
b. dns
c. ttl caching
d. none of these

Answers

None of these explanations - the correct setting for this operation is Lookup. It is a setting that acts on behalf of the client and queries the ISP.

One of the most important settings on a local DNS server is the "lookup" setting. This setting allows the local DNS server to query an ISP DNS server on behalf of the host. This is a very important setting, because it allows the local DNS server to resolve DNS queries for the host.

Without the lookup setting, the local DNS server would not be able to resolve DNS queries for the host. This would cause the host to be unable to connect to the internet. The lookup setting is a very important setting on a local DNS server.

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What best describes proprietary file format?
A format that is closed but free of cost.
A format that is owned by a person or group.
A format that is not bound by copyright law.
A format that is open and free of cost.

Answers

Answer:

A format that is closed but free of cost.

Answer:

A

✔ free

format is not bound by copyrights, trademarks, patents, or restrictions.

A

✔ proprietary

format is considered to be intellectual property, which means it is owned by an individual or organization.

An open file format

✔ can be free or proprietary

A closed file format

✔ is unpublished

Explanation:

Employees in XYZ Corporation all use the same word processing program. The program they are using is more than five years old. Over the years, a number of improvements have been made to the application. The company has decided to upgrade the software for its employees. Two IT employees will install the upgrade on each employee's computer. They estimate that it will take them an hour to install each upgrade. The company has one hundred employees, so they figure it will take approximately fifty hours to finish installing the upgrades — more than an entire workweek! In the space below, describe how a network would make this task easier.

Answers

For the situation given above, creating a network of computers will save a lot of working hours, and make the task of using the word processing programs much easier.

What is the significance of a computer network?

A computer network can be referred to or considered as the network of multiple interconnected computers in a system where they are used for the purpose of linking one main hub or server to a number of systems, thereby making the tasks controllable by a single system.

Therefore, the significance regarding computer networks has been aforementioned.

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If you are doing modular division with a divisor of 4, what are the only possible answers?

A. 1 2 3 4
B. 1 2 3
C. 0 1 2 3 4
D. 0 1 2 3

Answers

The answer is C have a great day!

0 1 2 3 4 are the only possible answers. As If you are doing modular division with a divisor of 4. Hence, option C is correct.

What is modular division?

Arithmetic that divides two whole numbers by a predetermined integer, replacing the original values with the remainders. In a modular arithmetic system with a modulus of 5, 3 times 4 = 2.

The modulo operator is represented by the arithmetic operator %. The modulo division operator results in the remainder of an integer division. Syntax: If x and y are integers, the expression: x% y. produces the residual when x is divided by y.

The remainder operator, also known as the modulo operator, returns the remainder of the two numbers. Ask yourself if there is any remainder after dividing two numbers, let's say A and B, where A is the dividend and B is the divisor, using the formula A.

Thus, option C is correct.

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Why is it important to continually review and refine the system throughout its lifecycle?

Answers

Systems are living entities that need to be continually reviewed and refined in order to stay effective. Just like how a person needs to continuously learn and evolve throughout their life, a system also needs to do the same in order to remain relevant.

There are many reasons why it’s important to review and refine a system. As the environment changes, the system needs to be able to adapt to new conditions. Additionally, as new technologies are developed, the system needs to be able to take advantage of them to improve performance.

It’s also important to review and refine a system in order to prevent stagnation. If a system is never changed, it will eventually become obsolete as the world moves on without it. By continually review and refine the system, we can keep it up-to-date and relevant.

So, why is it important to review and refine a system? There are many reasons, but ultimately it comes down to the fact that a system needs to be able to change and adapt in order to survive.

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In which situation would setting be the most important when posing a subject?
A) if the photograph is taken for a yearbook
B) if the photograph is taken for product placement
C) if the photograph is taken using props
D) if the photograph is taken for an actor’s headshot

Answers

The situation that setting would  be the most important when posing a subject is option C) if the photograph is taken using props.

What use do props serve in photography?

Props are said to be any items that are utilized to enhance and clarify the main subject of a photograph. When taking portrait photos, a prop will make the person stand out.

Additionally, it will let the person wants to who they are. The use of portrait props can be a tool that give creative photography concepts a fictional edge.

Therefore, The situation that setting would  be the most important when posing a subject is option C) if the photograph is taken using props.

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Some database changes will only take effect once the database or database object has been ________.

Answers

Some database changes will only take effect once the database or database object has been “Execute

This information is used to show the objects in the database tools window, and display their DDL during completion. You can update the source code of database objects directly by DDL and submit your changes. The IDE will generate a migration script to verify and then execute it in the database. The migration involves the database transformation from one database to another.

DBMS provides public application programming interfaces and a process of database language SQL to allow applications to be written to interact with and manipulate the database. DDL statements are used to build and modify the structure of your tables and other objects in the database. When you execute DDL statements it takes effect immediately.

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Interviewing, counseling, and communication in relationships are all considered which type of communication?

Answers

Interviewing, counseling, and communication in relationships are all considered structured communication.

Structured communication can be described as a method that improves interactions between people to allow a better exchange of information.

Structured communication is also favorable for conversations involving more than two individuals. Therefore, this type of conversation can be used by complex organizations and healthcare systems as it organizes ideas more effectively.

Interviewing can be described as verbal question-answer sessions between two or more people. Usually, this interaction is not predetermined and is in a free form.

Counseling can be described as a type of remedy in which a person communicates with the counselor to discuss his difficulties in life.

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A(n) ________ forecasts technology trends and evaluates and experiments with new technologies.

Answers

An emerging technology manager forecasts technology trends and evaluates and experiments with new technologies.

What is forecasts technology?

A forecast technology is a technology that is sued to forecast reports. This technology is used to estimate things before this is happening. They are used for weather forecasting, money values forecasting, and other things.

They used variables and patterns that are made before time, they focus on before things and check the patterns.

Thus, a manager of emerging technologies analyzes evaluates and tests new technologies.

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The __________ considers four different perspectives: customer, internal, innovation and learning, and financial.

Answers

The answer:
Balanced scorecard

In the expression 25, what is the 2?
0 A. exponent
OB.
power
OC. base
OD. model

Answers

Answer:

C

Explanation:

trust

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