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DBMS MCQ Solved Paper for RBI Grade B officer

Thursday 9th of March 2023

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1. The set of all values that can be taken by the attribute is called as _______ of the attribute.
A. Tuple
B. Cardinality
C. Degree
D. Domain
Answer : D
2. Key to represent relationship between tables is called
A. primary key
B. secondary key
C. foreign key
D. none of the above
Answer : C
3. _____clause is an additional filter that is applied to the result.
A. Select
B. Order by
C. Group-by
D. Having
Answer : D
4. In SQL, testing whether a subquery is empty is done using
A. DISTINCT
B. UNIQUE
C. NULL
D. EXISTS
Answer : D
5. A ____ key specifies a uniqueness constraint that no two distinct tuples in any state r of relation R can have the same value for super key.
A. Sub
B. Parent
C. Candidate
D. Super
Answer : D
6. 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
7. Tree structures are used to store data in
A. Network model.
B. Relational model.
C. Hierarchical model.
D. File based system.
Answer : C
8. The concept of mapping of ______ entity types is the concept in which the for each strong entity type E in the ER schema, create a relation R that includes all the simple attributes of E.
A. Regular
B. Irregular
C. None
D. Weak
Answer : A
9. What is data integrity?
A. It is the data contained in database that is non redundant.
B. It is the data contained in database that is accurate and consistent.
C. It is the data contained in database that is secured.
D. It is the data contained in database that is shared.
Answer : B
10. If a transaction T has obtained an exclusive lock on item Q, then T can
A. read Q
B. write Q
C. both read and write Q
D. write Q but not read Q
Answer : C
11. 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
12. 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
13. Which of the following is a reason to model data?
A. Understand each user's perspective of data
B. Understand the data itself irrespective of the physical representation
C. Understand the use of data across application areas
D. All of the above
Answer : D
14. 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
15. Which of the following is not a characteristic of a relational database model?
A. Table
B. Tree like structure
C. Complex logical relationship
D. Records
Answer : B
16. The default level of consistency in SQL is
A. repeatable read
B. read committed
C. read uncommitted
D. serializable
Answer : D
17. 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
18. Protection of data from unauthorized Disclosure results in loss of _______
A. Integrity
B. Availability
C. Confidentiality
D. Discretionary Security
Answer : C
19. 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
20. Cascading rollback is avoided in all protocol except
A. strict two-phase locking protocol.
B. tree locking protocol
C. two-phase locking protocol
D. validation based protocol.
Answer : D
21. A table can have only one
A. Secondary key
B. Alternate key
C. Unique key
D. Primary key
Answer : D
22. 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
23. 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. Which of the following aggregate functions does not ignore nulls in its results?.
A. COUNT .
B. COUNT (*)
C. MAX
D. MIN
Answer : B
25. Wait-for graph is used for
A. detecting view serializability.
B. detecting conflict serializability.
C. deadlock prevention
D. deadlock detection
Answer : D
26. 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
27. 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
28. 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
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. 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
31. For using a specific database …………… command is used.
A. use database
B. database name use
C. Both A & B
D. None of them
Answer : A
32. Assume transaction A holds a shared lock R. If transaction B also requests for a shared lock on R.
A. It will result in a deadlock situation.
B. It will immediately be rejected.
C. It will immediately be granted.
D. It will be granted as soon as it is released by A .
Answer : C
33. ______is a special type of integrity constraint that relates two relations & maintains consistency across the relations.
A. Domain Integrity Constraints
B. Referential Integrity Constraints
C. Domain Constraints
D. Entity Integrity Constraints
Answer : B
34. 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
35. Which is the best file organization when data is frequently added or deleted from a file?
A. Sequential
B. Direct
C. Index sequential
D. None of the above
Answer : B
36. Between DRAM and magnetic disk storage another form of memory, called ______ memory is becoming common because it is non volatile.
A. RAM
B. Flash
C. Hard Disk
D. Secondary
Answer : B
37. 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
38. DROP is a statement in SQL.
A. Query
B. Embedded SQL
C. DDL
D. DCL
Answer : C
39. _____is a full form of SQL.
A. Standard query language
B. Sequential query language
C. Structured query language
D. Server side query language
Answer : C
40. A logical schema
A. is the entire database
B. Describes how data is actually stored on disk.
C. is a standard way of organizing information into accessible parts.
D. All of the above
Answer : C
41. ____specifies a search condition for a group or an aggregate.
A. GROUP BY Clause
B. HAVING Clause
C. FROM Clause
D. WHERE Clause
Answer : B
42. In multiple granularity of locks SIX lock is compatible with
A. IX
B. IS
C. S
D. SIX
Answer : B
43. It is an abstraction through which relationships are treated as higher level entities
A. Generalization.
B. Specialization.
C. Aggregation.
D. Inheritance.
Answer : C
44. In a multi-user database, if two users wish to update the same record at the same time, they are prevented from doing so by
A. jamming
B. password
C. documentation
D. record lock
Answer : D
45. Consider the join of relation R with a relation S. If R has m tuples and S has n tuples, then the maximum and minimum size of the join respectively are
A. m+n and 0
B.m+n and |m-n|
C. mn and 0
D. mn and m+n
Answer : C
46. The statement that is executed automatically by the system as a side effect of the modification of the database is
A. backup
B. assertion
C. recovery
D. trigger
Answer : D
47. A relational database developer refers to a record as
A. an attribute
B. a tuple
C. a criteria
D. a relation
Answer : B
48. ______ keyword is used to find the number of values in a column.
A. TOTAL
B. ADD
C. COUNT
D. SUM
Answer : C
49. Which of the following addressing modes permits relocation without any change over in the code?
A. Indirect addressing
B. Indexed addressing
C. PC relative addressing
D. Base register addressing
Answer : B
50. 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
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