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468 DBMS Questions and answers section with explanation for various online exam preparation, various interviews, Computer Knowledge DBMS online test. DBMS Questions with detailed description, explanation will help you to master the topic.

DBMS Questions

1. Which of the following is a relational database



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Correct Ans:4th Dimensions
Explanation:


2. Which of the following is the problem of file management system? (a) Lack of data independence(b) Data redundancy(c) Update (d) all Periodically adding, changing, & Deleting file records is called file



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Correct Ans:Renewing
Explanation:


3. For a database relation R(a, b, c, d) where the domains of a, b, c, d include only the atomic values. The functional dependency a ? c, b ? d holds in the following relation



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Correct Ans:In 2NF not in 3NF
Explanation:


4. The employee information of an Organization is stored in the relation : Employee (name, sex, salary, deptname) Consider the following SQL query Select deptname from Employee Where sex = 'M' group by deptname having avg (salary) > {select avg (salary) from Employee} Output of the given query corresponds to



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Correct Ans:Average salary of male employees in a department is more than average salary of the organization
Explanation:


5. The “PROJECT” operator of a relational algebra creates a new table that has always



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Correct Ans:Same number of rows as the original table
Explanation:


6. If D1,D2, ....Dn are domains in a relational model, then the relation is a table, which is a subset of



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Correct Ans:D1?D2? ... ?Dn
Explanation:


7. Consider a schema R(A, B, C, D) and functional dependencies A ? B and C ? D. Then the decomposition R1(A, B) and R2(C, D) is



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Correct Ans:Dependency preserving but not lossless join
Explanation:


8. B+ tree are preferred to binary tree in Database because



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Correct Ans:Disk access is much slower than memory access
Explanation:


9. In multiuser database if two users wish to update the same record at the same time, they are prevented from doing so by



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Correct Ans:Record lock
Explanation:


10. If a relation with a Schema R is decomposed into two relations R1 and R2 such that (R1 ? R2) = R1 then which one of the following is to be satisfied for a lossless joint decomposition (? indicates functional dependency)



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Correct Ans:(R1 ? R2) ? R1 or R1 ? R2 ? R2
Explanation:


11. The User Work Area (UWA) is a set of Program variables declared in the host program to communicate the contents of individual records between



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Correct Ans:Host program and DBMS
Explanation:


12. With QBE, inserting records from one or more source tables into a single target table can be achieved by:



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Correct Ans:Append action query
Explanation:


13. Match the following :
a.Foreign keys --- i.Domain constraint
b.Private key --- ii.Referential integrity
c.Event control action model --- iii.Encryption
d.Data security --- iv. Trigger



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Correct Ans:a b c d ii i iv iii
Explanation:


14. Which of the following is the process of selecting the data storage and data access characteristics of the database?



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Correct Ans:Physical database design
Explanation:
Physical database design is the process of selecting the data storage and data access characteristics of the database.


15. ______________ which increases the number of I/O operations needed to write a single logical block, pays a significant time penalty in terms of write performance.



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Correct Ans:RAID level 5
Explanation:
In level 5, all disks can participate in satisfying read requests, unlike RAID level 4, where the parity disk cannot participate, so level 5 increases the total number of requests that can be met in a given amount of time.


16. ___________ is popular for applications such as storage of log files in a database system, since it offers the best write performance.



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Correct Ans:RAID level 1
Explanation:


17. Hardware RAID implementations permit _________; that is, faulty disks can be removed and replaced by new ones without turning power off.



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Correct Ans:Hot swapping
Explanation:
Hot swapping reduces the mean time to repair, since replacement of a disk does not have to wait until a time when the system can be shut down.


18. The operation of moving from finer-granularity data to a coarser granularity (by means of aggregation) is called a ________.



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Correct Ans:Rollup
Explanation:


19. Establishing limits on allowable property values, and specifying a set of acceptable, predefined options that can be assigned to a property are examples of:



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Correct Ans:Data integrity constraints
Explanation:


20. A _________ integrity constraint requires that the values appearing in specified attributes of any tuple in the referencing relation also appear in specified attributes of at least one tuple in the referenced relation.



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Correct Ans:Referential
Explanation:
A relation, say r1, may include among its attributes the primary key of another relation, say r2. This attribute is called a foreign key from r1, referencing r2. The relation r1 is also called the referencing relation of the foreign key dependency, and r2 is called the referenced relation of the foreign key.





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