Technical Questions

Q:

 ON UPDATE CASCADE ensures which of the following?

A) Normalization B) Data Integrity
C) Materialized Views D) All of the above.
 
Answer & Explanation Answer: B) Data Integrity

Explanation:
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Q:

 A DBMS that combines a DBMS and an application generator is ________ .

A) Microsoft's SQL Server B) Microsoft's Access
C) IBM's DB2 D) Oracle Corporation's Oracle
 
Answer & Explanation Answer: B) Microsoft's Access

Explanation:
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Q:

Explain Belady's Anomaly?

Answer

Also called FIFO anomaly. Usually, on increasing the number of frames allocated to a process virtual memory, the process execution is faster, because fewer page faults occur. Sometimes, the reverse happens, i.e., the execution time increases even when more frames are allocated to the process. This is Belady's Anomaly. This is true for certain page reference patterns.

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Q:

 A goal of data mining includes which of the following?

A) To explain some observed event or condition B) To analyze data for expected relationships
C) To confirm that data exists D) To create a new data warehouse
 
Answer & Explanation Answer: A) To explain some observed event or condition

Explanation:
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Q:

If no multivalued attributes exist and no partial dependencies exist in a relation, then the relation is in what normal form?

A) First normal form B) Second normal form
C) Third normal form D) Fourth normal form
 
Answer & Explanation Answer: B) Second normal form

Explanation:
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Q:

 For what purposes are views used?

A) To hide rows only B) To hide columns only
C) To hide complicated SQL statements only D) All of the above are uses for SQL views.
 
Answer & Explanation Answer: D) All of the above are uses for SQL views.

Explanation:
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Q:

 Which of the following is the original purpose of SQL?

A) To specify the syntax and semantics of SQL data definition language B) To specify the syntax and semantics of SQL manipulation language
C) To define the data structures D) All of the above.
 
Answer & Explanation Answer: D) All of the above.

Explanation:

SQL is a domain-specific language used in programming and designed for managing data held in a relational database management system, or for stream processing in a relational data stream management system.

 

Purpose of SQL are ::

* To define the data structures

* To specify the syntax and semantics of SQL manipulation language

* To specify the syntax and semantics of SQL data definition language

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Q:

What is the cause of thrashing? How does the system detect thrashing? Once it detects thrashing, what can the system do to eliminate this problem?

Answer

Thrashing is caused by under allocation of the minimum number of pages required by a process, forcing it to continuously page fault. The system can detect thrashing by evaluating the level of CPU utilization as compared to the level of multiprogramming. It can be eliminated by reducing the level of multiprogramming.

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