Top 1000+ Database Subject Mcqs Pdf Download Set No 02

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51. Making a change to the conceptual schema of a database but not affecting the existing external schemas is an example of

  1. Physical data independence
  2. Concurrency control.
  3. Logical data independence.  
  4. Functional dependency

 52. Identify the constraint that limits the values that can be placed in a column.

  1. NOT NULL    
  2. CHECK
  4. UNIQUE                  

53. Which of the following enforces a relation into 1st normal form?

  1. The domain of attribute must include only atomic values.
  2. Every non-key attribute is fully functionally dependent on primary key
  3. non-key  attribute is non-transitively dependent on primary key.
  4. Every non-key attribute is partially dependent on super key

54. Controlling redundancy in a database management system DOES NOT help to

  1. avoid duplication
  2. avoid unnecessary wastage of storage space 
  3. avoid unauthorized access to data  avoid inconsistency among data

55. Which of the following is CORRECT about database management system’s languages?

  1. Data definition languages are used to specify the conceptual schema only.
  2. Data manipulation languages are used to create the databases.
  3. Data manipulation languages are used for retrieval, insertion, deletion and modification of data.
  4. Data definition languages are only used to update data in the DBMS.     

56. Which of the following is INCORRECT statement concerning the database design process?

  1. During requirements collection and analysis phase, one can gather the data requirements of
  2. database users.
  3. By referring to a high level data model, it is possible to understand the data requirements of the users, entity types, relationships and constraints.
  4. Transformation of the high level data model into the implementation data model is called logical design or data model mapping.
  5. During the logical design phase of internal storage structures, access paths and file organization for the database files are specified.

57. Identify the INCORRECT statement among the given.

  1. An entity may be an object with a physical existence like a car, a house or an Employee.  One cannot consider something which has conceptual existence like a course in a degree program as an
  2. entity.
  3. Age can be considered as a single value attribute of a person.
  4. An entity type describes the schema or intension for a set of entities which share the same structure.

58. Select the correct statement among the following.

  1. Role names are not technically necessary in relationship types when all the participating entity types are distinct.
  2. When different entity types participate only once in a single relationship type it is called a recursive relationship.
  3. Cardinality ratios for binary relationship are displayed on Entity Relationship Diagrams by using a diamond shape notation.
  4. Partial participation which is also called existence dependency is displayed as a double line connecting the participating entity type to the relationship.

59. In a relation, which of the following refers by the Structural constraints?

  1. finding the owner entity type relevant to a given entity type.
  2. the number of relationship instances which an entity can participate in.
  3. the role that a participating entity from the entity type plays in each relationship instance.
  4. the constraints applicable in granting access to tables, columns and views in a database
  5. schema 

60.  Identify the correct statement.

  1. Entity integrity constraints specify that primary key values can be composite.
  2. Entity integrity constraints are specified on individual relations.
  3. Entity integrity constraints are specified between weak entities.
  4. When entity integrity rules are enforced,
  5. a tuple in one relation that refers to another relation must refer to an existing tuple.

61. Which of the following is true about relational schema?

  1. The sequence of columns is significant
  2. The sequence of rows is significant.
  3. Contains only derived attributes.  Values are atomic. 

62. Identify the factor which enforces a relation in 3NF?

  1. Every non-key attribute is fully functionally dependent on primary key
  2. Every non-key attribute is partially dependent on super key
  3. The domain of attribute must include only atomic values.  Every non-key attribute is non-transitively dependent on primary key.
  4. all           

63. If W, X, Y and Z are attributes of a relation, which of the following inference rules for functional dependencies is correct?

  1. If (X, Z) -> Y then X -> Y and Z -> Y.  If X -> Y and X -> Z then X -> (Y, Z). 
  2. If X      Y then Y -> X
  3. If X -> Y then (X, Z) -> (Y,W).
  4. all 

64. Which of the following is not a benefit of normalization?

  1. Minimize insertion anomalies
  2. Minimize deletion anomalies 
  3. Minimize updating anomalies 
  4. Maximize redundancy

65. A candidate key that does not have a null value and is selected to uniquely identify all other attribute values in any given row is called a ____.

  1. Super key
  2. candidate key
  3. primary key
  4. secondary key

66. What is sub-type discriminator?

  1. The subtype discriminator,
  2. you  will add to the super type table for a disjoint condition (or non-overlapping condition).
  3. The purpose of the subtype discriminator is to help you avoid having to
  4. write sub queries or joins just to find information
  5. Such as the names of all AARP members.
  6. But when subtypes overlap, this simple discriminator structure doesn’t work.

67. In which condition a relation in first normal form, automatically turns into the second normal form?

  1. Those that do not depend upon the combination
  2. key, are moved to another table on whose key they depend on.

68. Structures which do not contain combination keys are automatically in second normal form.

 State the two major benefits of referential integrity constraints?

  1. Often, in relational database,
  2. to ensure that a value that appears in one relation for a given set of attributes also appears for a certain set of attributes in another relation.
  3. This condition is called Referential integrity (RI).
  4. It  is the concept of relationships between tables, based on the definition of a primary key and a foreign key.

69. The following summarize the benefits of referential integrity

  1. Ensure data integrity and consistency base on primary key and foreign key ..
  2. Increases development productivity, because it is not necessary to code
  3. SQL statements to enforce referential constraints,
  4. the  data RDBMS automatically enforces referential integrity.

70. What is table. 

  1. it consist of rows and columns.
  2. The columns save the qualities that describe the group of data.
  3. Every row contains full record of a particular data.
  4. Every table has a Primary key which denotes
  5. all

71. Consider the following two columns. The Column A consists of terms related to the ER model and Column B consists of terms used in the relational model.?

  1. The terms in Column A have been mapped to Column B so that it corresponds to the mapping process of the ER Model into a Relational model.
  2. Map
  3. each of the entry in column A to the appropriate entry
  4. in column B

72.  What is a Relation?

  1. A relation is a table that holds the data we are interested in.
  2. It is two-dimensional and has rows and columns.
  3. none

73. Each entity type in the ER model is mapped into a relation.

  1. The attributes become the columns.
  2. The individual entities become the rows.
  3. 1-entity    type relation
  4. 2key attributes>>>primary or secondary keys
  5. 3->composite attribute-> relation and foreign keys )

74. Why do we need to know the specific data model of any DBMS?

  1. all.
  2. Hierarchical Model
  3. Network Model Relational Model
  4. Data in a series of records, which have a set of field values attached to it. It collects all the instances of a specific record together as a record type.
  5. These record types are the equivalent of

75.Type of t

  1. Logical modeling
  2. Physical modeling
  3. all

76. logical model

  1. Logical modeling deals with gathering business requirements and converting those requirements into a model.
  2. The logical model revolves around the needs of the business, not the database
  3. All
  4. needs of the business are used to establish the needs of the database.
  5. Logical modeling involves gathering information about business processes, business entities

77. Diagram

  1. The diagrams produced should show the processes and data that exists, as well as the relationships between business processes and data.
  2. Logical modeling should accurately render a visual
  3. representation of the activities and data relevant to a particular business.
  4. The diagrams and documentation generated during logical modeling is used to determine whether the requirements of the business have been completely gathered.

78 . Entity relationship diagrams

  1. An Entity Relationship Diagram is also referred to as an analysis ERD.
  2. ERD is to provide the development team with a picture of the different categories
  3. categorize data

79. Business process diagrams

  1. The process model illustrates all the parent and child processes that are performed by individuals within a company.
  2. The process model gives the development team an idea of how data moves within
  3.  all

80. Physical Modeling

  1. Physical modeling involves the actual design of a database according to the requirements that were established during logical modeling.
  2. Logical modeling mainly involves gathering the requirements
  3. all

81. Schema

  1. It is into a relational database model.
  2. When physical modeling occurs, objects are being defined at the schema level.
  3. A schema is a group of related objects in a database.
  4. A database design effort is normally associated with one schema.
  5. modeling..

82. Physical modeling

  1. Physical modeling is database software specific, meaning that the objects defined during physical modeling can vary depending on the relational database software being used.
  2. data is stored, although basic data types are conceptually the same among different implementations.
  3. all

 83. Types of physical modeling

  1. Server model diagrams
  2. User feedback documentation
  3. Database design documentation
  4. Both a, b

84. Which of the following is NOT a feature of Context DFD?

  1. one process (which represents the entire system)  all sources/sinks (external entities)
  2. data flows linking the process to the sources and sinks (external entities)
  3. sub -processes (which explain and decomposed the major process into small processes)  

85. Which of the following is true for the relational model?

  1. Degree of a relation is the number of rows in a relation.
  2. Null value is a blank or zero value given to an attribute value when its value is inapplicable or its value is unknown.
  3. Complex key is a key consisting of more than one attribute.
  4. Constraint is a rule that restricts the values in a database.

86. Which one of the following four E-R diagrams is the typical result you obtain when you initially start with an E-R diagram containing just two entities,

  1. One to one
  2. Many-to-Many relationship
  3.  both A and B
  4. introduce an associative entity

87. Which of the following most certainly implies the need for an entire table to implement?

  1. A binary relationship
  2. A ternary relationship          
  3. An identifying relationship

88. Which of the following constraints enforces entity integrity?

  3.  CHECK
  4. NOT NULL            

89. Which of the following is not true about relational tables?

  1. Column values are of the same kind.
  2. Each row is unique.
  3. Each column must have a unique name.
  4. The sequence of rows is significant.

90. In a conceptual model for a university, what type of relationship exists between Grade and Student entities?

  1. 1M        
  2. MM
  3. Ternary           

91.Controlling redundancy in a database management system DOES NOT help to

  1. avoid duplication 
  2. avoid unnecessary wastage of storage space

92. Inconsistency?

  1. avoid unauthorized access to data          
  2. avoid inconsistency among data
  3. none                  


93. Which of the following is INCORRECT with respect to file systems?

  1. At the physical level, pointer or hashed address scheme may be employed to provide a certain degree of data independence at the user level.
  2. A logical record is concerned with efficient storage of information in the secondary storage devices.
  3. Some physical organizations use pointers to record blocks to locate records on disk. 
  4. The efficiency of a file system depends on how efficiently operations such as retrieve,
  5. Insert
  6. none

94. Which of the following functions are NOT performed by a database administrator?

  1. Planning, designing and implementing database systems
  2. Establishing standards and procedures for database systems
  3. Communicating with database users  
  4. Allocation of storage locations and data structures

 95. Select the correct statement about the ANSI/SPARC architecture.     

The conceptual level is a level of indication between the internal level and the external level.

The internal level in a database system will definitely be relational.

Any given database has many conceptual schemas and one physical schema, but it has only one external schemas.

The external level is not concerned with individual user perceptions, while the conceptual level is concerned with a community user perception.

96. Which of the following is a correct way to implement one-to-many relationship while designing tables?

  1. by splitting the data into two tables with primary key and foreign key relationships.
  2. using a junction table with the keys from both the tables forming the composite primary key of the junction table.
  3. by splitting each table into three
  4. as a single table and rarely as two tables with primary and foreign key relationships.               

97. Which of the following is not a benefit of normalization?

  1. Minimize insertion anomalies
  2. Minimize deletion anomalies  Minimize updating anomalies
  3. Maximize redundancy

98. Consider the following relation R and its sample data. (Consider that these are the only topples for the given relation)

Which of the following statements is NOT correct?

  1. The functional dependency (Employee No, Department No) -> Project No holds over R. 
  2. The functional dependency Employee No -> Department No holds over R. 
  3. The functional dependency Project No -> Department No holds over R.
  4. The functional dependency (Emptor, Project No) -> Dept No holds over R.               

99. The Entity Relation Model models

  1. Entities, Relationships and Processes
  2. Entities and Relationships 
  3. Relationships
  4. Entities           

100. As part of database naming conventions, attribute names should use suffixes such as ID, NUMBER or CODE for the ?

  1. primary key
  2. foreign key  index
  3. determinant
  4. none