Answer:
b. foreign key
Explanation:
In the database world, a foreign key is a field on one table and a primary key for another table. The purpose of a foreign key is to provide linkages between two or more tables. Given two tables A and B, and making A the point of reference, a primary key is a field that is unique in A while a foreign key is unique in B.
On another hand, a composite primary key is a combination of two or more fields/columns on database table that can be used to uniquely identify each row in the table.
In the database lingua, what we have is a unique key not a distinct key, though the two words are similar in meaning.
A duplicate key is used when an information may be repeatedly entered on a table.
So the correct option is a foreign key.
B.................................
Answer:
The answer is "Least recently used policy".
Explanation:
It is the page replacement policy, which uses a less frequent substitute. It adds a registry from each frame that includes the last time the program, that views within the frame, and use a "logical clock" for each of the data references, that made to change by a tick.
This replacement strategy is often used to substitute its least currently utilized cache line or page, and it is realistic and best implemented among the substitution policies.
Im pretty sure it
<span>No automatic filtering
Partial automatic filtering
</span><span>Safe lists only
</span><span>High
</span>
Answer:
Improved performance.
Reduced system load.
Protection for source code and programs.
Improved productivity and quality.
Portability of compiled programs.
SAA compliance checking.