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3 years ago

Which practice enables recovery of accidental deletions in data records?

Computers and Technology

2 answers:

icang [17]3 years ago

5 0

If it's on a document usually ctrl+z

mario62 [17]3 years ago

4 0

Answer:

Data backup

Explanation:

It is understood by backup, backup of information, backup copy, a copy that is made of the original data and files in order to prevent the partial or total loss of information from the hard disk or any other device.

Backups are usually made on a storage medium other than the original, such as an external storage unit. In this way, in the worst case, the files saved on the computer would not be lost or damaged.

In this case, the user will be more satisfied to know that their data and information are backed by any computer failure, whether casual or massive, caused by breakdowns, technical failures or a cyberattack.

It is important to make backup copies of the data stored from time to time, especially those that are considered of great value as texts, images or videos.

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There are several possible reasons why a high percentage of IT projects are abandoned-the business strategy changed, technology

aleksklad [387]

Answer:

a. True

Explanation:

The above listed information are part of the reasons why so many IT projects are abandoned by the business entities after a given period of time frame.

5 0

3 years ago

Consider a relation BOOKS that holds information about the inventory of books (used or new) in a bookstore with attributes (titl

Yuri [45]

Answer:

See explaination

Explanation:

Somehing is considered functional dependent (FD) if a relationship between two attributes, typically between the PK and other non-key attributes within a table. For any relation R, attribute Y is functionally dependent on attribute X (usually the PK), if for every valid instance of X, that value of X uniquely determines the value of Y.

Please kindly check attachment for the other details.

5 0

3 years ago

"Most of us know that when we come into a college classroom, we will see desks and chairs, a computer station and a projector. A

gayaneshka [121]

Accessibility... I think

3 0

3 years ago

Give a big-O estimate for the number additions used in this segment of an algorithm.

rjkz [21]

Big-O notation is a way to describe a function that represents the n amount of times a program/function needs to be executed.

(I'm assuming that := is a typo and you mean just =, by the way)

In your case, you have two loops, nested within each other, and both loop to n (inclusive, meaning, that you loop for when i or j is equal to n), and both loops iterate by 1 each loop.

This means that both loops will therefore execute an n amount of times. Now, if the loops were NOT nested, our big-O would be O(2n), because 2 loops would run an n amount of times.

HOWEVER, since the j-loop is nested within i-loop, the j-loop executes every time the i-loop <span>ITERATES.
</span>
As previously mentioned, for every i-loop, there would be an n amount of executions. So if the i-loop is called an n amount of times by the j loop (which executes n times), the big-O notation would be O(n*n), or O(n^2).

(tl;dr) In basic, it is O(n^2) because the loops are nested, meaning that the i-loop would be called n times, and for each iteration, it would call the j-loop n times, resulting in n*n runs.

A way to verify this is to write and test program the above. I sometimes find it easier to wrap my head around concepts after testing them myself.

3 0

4 years ago

Which of the following is not a SQL*Loader file?

MatroZZZ [7]

Answer:

D. Good file

Explanation:

SQL loader is responsible for loading data from files into the database. It needs the mandatory control file, bad file, log file and an optional discard file.

A. Bad file

This file shares its name with the data file and has .bad extension.

The bad file holds all the records which are rejected ( bad data ). If a bad file is not available, it is automatically created. The data is either rejected by the SQL loader or by Oracle itself. The rejected records are not placed in the data file and hence, have to be placed in the bad file.

It is mandatory to have a bad file for every data file.

B. Control file

This is a mandatory file. This is a text file needed by the SQL loader to perform the loading process.

It contains the information related to location of data, specifies the criteria for selecting data for insertion, location for inserting data, and the like.

C. Discard file

The discard file is created if the need arises. This is not a mandatory file to be present.

The data which is discarded and gets filtered out, is placed in the discard file.

The data is not inserted in the table because it does not matches the criteria for the data to be inserted.

This criteria is mentioned in the control file.

The data is discarded only due to the mismatch and not because it is rejected or is bad data.

E. Log file

This file is mandatory to the execution. In absence of log file, the loader does not proceeds with execution and gets terminated.

In the beginning of the execution, a log file must be created by the loader. This file contains all the information regarding the data loading and also the errors encountered during the loading process.

6 0

3 years ago