1000+ DBMS MCQ for LSAT [Solved]

1. _______ product was acquired by Informix, integrated into its RDBMS and introduced as the Informix Universal Server an ORDBMS.
A. Star
B. llustar
C. SQL
D. Cygnus
Answer : B

2. The data in the database at a particular moment of time is called the _______
A. Snapshot
B. Dynaset
C. Stateless
D. Stateful
Answer : A

3. In an ER model,_____ is described in the database by storing its data.
A. Entity
B. Attribute
C. Relationship
D. Notation
Answer : A

4. The values of the attribute describes a particular
A. Entity set
B. File
C. Entity instance
D. Organization
Answer : C

5. What are the desirable properties of a decomposition
A. Partition constraint.
B. Dependency preservation.
C. Redundancy.
D. Security.
Answer : B

6. The size of a data item is called its _______, which can be a field of some record or may be a larger unit such as a record.
A. Similarity
B. Granularity
C. Dimensionality
D. Arity
Answer : B

7. A ______ module is typically designed so that it will run on a user workstation or personal computer.
A. Software
B. Server
C. Program
D. Client
Answer : D

8. DBMS is a collection of _____ that enables user to create and maintain a database.
A. Keys
B. Program
C. Translators
D. Language Activity
Answer : B

9. Which of the following is not a consequence of non-normalized database?
A. Update Anomaly
B. Insertion Anomaly
C. Redundancy
D. Lost update problem
Answer : D

10. Which of the following is true for network structure?
A. It is a physical representation of the data.
B. It allows many to many relationship.
C. It is conceptually simple.
D. It will be the dominant database of the future.
Answer : A

11. The one guideline to be followed while designing the database is
A. A database design may be ambiguous.
B. It should avoid/reduce the redundancy.
C. Unrelated data should be in the same table so that updating the data will be easy.
D. An entity should not have attributes.
Answer : B

12. Which of the syntax is correct for insert statement?
i) insert into values
ii) insert into (column list) values
A. i-only
B. ii-only
C. Both of them
D. None of them
Answer : C

13. The relational model is based on the concept that data is organized and stored in two-dimensional tables called ______
A. Fields
B. Records
C. Relations
D. Keys
Answer : C

14. A relation is in attribute of other composite key. if an attribute of a composite key is dependent on an
A. 2NF
B. 3NF
C. BCNF
D. 1NF
Answer : B

15. The keyword to eliminate duplicate rows from the query result in SQL is
A. DISTINCT
B. NO DUPLICATE
C. UNIQUE
D. None of the above
Answer : C

16. Which of the following concurrency control schemes is not based on the serializability property?
A. Two - phase locking
B. Graph-based locking
C. Time-stamp based locking
D. None of these .
Answer : D

17. Dependency preservation is not guaranteed in
A. BCNF
B. 3NF
C. PJNF
D. DKNF
Answer : A

18. Which normal form is considered adequate for normal relational database design?
A. 2NF
B. 5NF
C. 4NF
D. 3NF
Answer : D

19. Use of UNIQUE while defining an attribute of a table in SQL means that the attribute values are
A. distinct values
B. cannot have NULL
C. both (A) & (B)
D. same as primary key
Answer : C

20. Which of the following is not a consequence of concurrent operations?
A. Lost update problem.
B. Update anomaly.
C. Unrepeatable read.
D. Dirty read.
Answer : B

21. Which of the following statement on the view concept in SQL is invalid?
A. All views are not updateable
B. The views may be referenced in an SQL statement whenever tables are referenced.
C. The views are instantiated at the time they are referenced and not when they are defined.
D. The definition of a view should not have GROUP BY clause in it.
Answer : D

22. The ______ indexes are forced to store only record IDs in the data structure and require at least one additional I/O Operation to retrieve the actual record.
A. Clustered
B. Hashed
C. Un-clustered
D. Collision
Answer : C

24. The clause in SQL that specifies that the query result should be sorted in ascending or descending order based on the values of one or more columns is
A. View
B. Order by
C. Group by
D. Having
Answer : B

25. When an E-R diagram is mapped to tables, the representation is redundant for
A. weak entity sets
B. weak relationship sets
C. strong entity sets
D. strong relationship sets
Answer : B

26. _____ database is used to provide statistical information or summaries of values based on various criteria.
A. Statistical
B. Mathematical
C. Normalized
D. Un normalized
Answer : A

27. Relational Algebra does not have
A. Selection operator.
B. Projection operator.
C. Aggregation operators.
D. Division operator.
Answer : C

28. In SQL the statement select * from R, S is equivalent to
A. Select * from R natural join S.
B. Select * from R cross join S.
C. Select * from R union join S.
D. Select * from R inner join S.
Answer : B

29. In SQL the word natural can be used with
A. inner join
B. full outer join
C. right outer join
D. all of the above
Answer : A

30. As per equivalence rules for query transformation, selection operation distributes over
A. Union.
B. Set difference.
C. Intersection.
D. All of the above.
Answer : D

31. _____clause is an additional filter that is applied to the result.
A. Select
B. Order by
C. Group-by
D. Having
Answer : D

32. Which of the following is not a logical database structure?
A. Chain
B. Network
C. Tree
D. Relational
Answer : A

33. Which one is correct statement?
Logical data independence provides following without changing application programs:
(i) Changes in access methods.
(ii) Adding new entities in database
(iii) Splitting an existing record into two or more records
(iv) C
A. (i) and (ii)
B. (iv) only
C. (i) and (iv)
D. (ii) and (iii)
Answer : D

34. Relationships among relationships can be represented in an-E-R model using
A. Aggregation
B. Association
C. Weak entity sets
D. Weak relationship sets
Answer : A

35. Relations produced from an E-R model will always be
A. First normal form.
B. Second normal form.
C. Third normal form.
D. Fourth normal form.
Answer : A

36. The data models defined by ANSI/SPARC architecture are
A. Conceptual, physical and internal
B. Conceptual, view and external
C. Logical, physical and internal
D. Logical, physical and view
Answer : D

37. According to the levels of abstraction, the schema at the intermediate level is called
A. Logical schema.
B. Physical schema.
C. Subschema.
D. None of the above.
Answer : D

38. If the closure of an attribute set is the entire relation then the attribute set is a
A. superkey
B. candidate key
C. primary key
D. not a key
Answer : A

39. What will be the number of columns and rows respectively obtained for the operation, A- B, if A B are Base union compatible and all the rows of a are common to B? Assume A has 4 columns and 10 rows; and B has 4 columns and 15 rows
A. 4,0
B. 0,0
C. 4,5
D. 8,5
Answer : A

40. Relational Algebra is
A. Data Definition Language .
B. Meta Language
C. Procedural query Language
D. None of the above
Answer : C

41. An advantage of views is
A. Data security
B. Derived columns
C. Hiding of complex queries
D. All of the above
Answer : A

42. Given the following relation S(SNO,SNAME,CITY) write a query to update the value of CITY to KANPUR for the supplier S1.
A. UPDATE S CITY = KANPUR WHERE SNO=S1
B. UPDATE S SET CITY = KANPUR FOR SNO=S1
C. UPDATE S SET CITY = KANPUR WHERE SNO=S1
D. UPDATE S RENAME CITY = KANPUR WHERE SNO=S1
Answer : C

43. By ______ an area on disk in certain ways, one can make it represent a bit value of either zero (0) or one (1).
A. Vulcanizing
B. Galvanizing
C. Magnetizing
D. Passing UV rays
Answer : C

44. _____ First proposed the process of normalization.
A. Edgar. W
B. Edward Stephen
C. Edgar F. Codd
D. Edward Codd
Answer : C

45. Which of the following constitutes a basic set of operations for manipulating relationaldata?
A. Predicate calculus
B. Relational calculus
C. Relational algebra
D. SQL
Answer : C

46. Protection of data from unauthorized Disclosure results in loss of _______
A. Integrity
B. Availability
C. Confidentiality
D. Discretionary Security
Answer : C

47. The rule that a value of a foreign key must appear as a value of some specific table is called a
A. Referential constraint.
B. Index.
C. Integrity constraint.
D. Functional dependency.
Answer : A

48. Which of the following is not comparison operator?
A. <>
B. <
C. =<
D. >=
Answer : C

49. In E-R Diagram total participation is represented by
A. Double lines
B. Single line
C. Dashed lines
D. Triangle
Answer : A

50. A table can have only one
A. Secondary key
B. Alternate key
C. Unique key
D. Primary key
Answer : D