McqMate
Chapters
1. |
Which of the following is a Data Model? |
A. | entity-relationship model |
B. | relational data model |
C. | object-based data model |
D. | all of the above |
Answer» D. all of the above |
2. |
A collection of related data. |
A. | Information |
B. | Valuable information |
C. | Database |
D. | Metadata |
Answer» C. Database | |
Explanation: A database is a collection of related data that is organized and structured in a way that allows for easy access and manipulation. It typically includes data tables, indices, and other components that are used to store, manage, and retrieve data. A database is a useful tool for storing and managing large amounts of structured data, and it is commonly used in a wide range of applications, including business, finance, healthcare, and more. |
3. |
DBMS is software. |
A. | True |
B. | False |
C. | none |
D. | all |
Answer» A. True |
4. |
DBMS manages the interaction between __________ and database. |
A. | Users |
B. | Clients |
C. | End Users |
D. | Stake Holders |
Answer» C. End Users |
5. |
Which of the following is not involved in DBMS? |
A. | End Users |
B. | Data |
C. | Application Request |
D. | HTML |
Answer» D. HTML |
6. |
Database is generally __________ |
A. | System-centered |
B. | User-centered |
C. | Company-centered |
D. | Data-centered |
Answer» B. User-centered |
7. |
A characteristic of an entity. |
A. | Relation |
B. | Attribute |
C. | Parameter |
D. | Constraint |
Answer» B. Attribute |
8. |
The restrictions placed on the data. |
A. | Relation |
B. | Attribute |
C. | Parameter |
D. | Constraint |
Answer» D. Constraint |
9. |
IMS stands for? |
A. | Information Mastering System |
B. | Instruction Management System |
C. | Instruction Manipulating System |
D. | Information Management System |
Answer» D. Information Management System |
10. |
A model developed by Hammer and Mc Leod in 1981. |
A. | SDM |
B. | OODBM |
C. | DDM |
D. | RDM |
Answer» A. SDM |
11. |
Object=_________+relationships. |
A. | data |
B. | attributes |
C. | entity |
D. | constraints |
Answer» C. entity |
12. |
Duplication of data at several places is called as _______________. |
A. | Data Inconsistency |
B. | Data Isolation |
C. | Atomicity Problem |
D. | Data Redundance |
Answer» D. Data Redundance |
13. |
Data Redundancy increases the cost of storing and retrieving data. |
A. | False |
B. | True |
C. | none |
D. | all |
Answer» B. True |
14. |
Which of the information is not redundant. |
A. | name |
B. | mobile |
C. | account-no |
D. | address |
Answer» C. account-no |
15. |
If in redundant file common fields are not matching then it results in _____________. |
A. | Data Inconsistency |
B. | Data Integrity Problem |
C. | Data Isolation |
D. | Data Redundancy |
Answer» A. Data Inconsistency |
16. |
It is difficult to access conventional file system than Database System. |
A. | True |
B. | False |
C. | none |
D. | all |
Answer» A. True |
17. |
An ________ is a set of entities of the same type that share the same properties, or attributes. |
A. | Entity set |
B. | Attribute set |
C. | Relation set |
D. | Entity model |
Answer» A. Entity set |
18. |
Entity is a _________ |
A. | Object of relation |
B. | Present working model |
C. | Thing in real world |
D. | Model of relation |
Answer» C. Thing in real world |
19. |
The descriptive property possessed by each entity set is _________ |
A. | Entity |
B. | Attribute |
C. | Relation |
D. | Model |
Answer» B. Attribute |
20. |
The function that an entity plays in a relationship is called that entity’s _____________ |
A. | Participation |
B. | Position |
C. | Role |
D. | Instance |
Answer» C. Role |
21. |
The attribute name could be structured as an attribute consisting of first name, middle initial, and last name. This type of attribute is called |
A. | Simple attribute |
B. | Composite attribute |
C. | Multivalued attribute |
D. | Derived attribute |
Answer» B. Composite attribute |
22. |
In a relation between the entities the type and condition of the relation should be specified. That is called as______attribute. |
A. | Desciptive |
B. | Derived |
C. | Recursive |
D. | Relative |
Answer» A. Desciptive |
23. |
_____________ can help us detect poor E-R design. |
A. | Database Design Process |
B. | E-R Design Process |
C. | Relational scheme |
D. | Functional dependencies |
Answer» D. Functional dependencies |
24. |
If a multivalued dependency holds and is not implied by the corresponding functional dependency, it usually arises from one of the following sources. |
A. | A many-to-many relationship set |
B. | A multivalued attribute of an entity set |
C. | A one-to-many relationship set |
D. | Both A many-to-many relationship set and A multivalued attribute of an entity set |
Answer» D. Both A many-to-many relationship set and A multivalued attribute of an entity set |
25. |
Which of the following has each related entity set has its own schema and there is an additional schema for the relationship set. |
A. | A many-to-many relationship set |
B. | A multivalued attribute of an entity set |
C. | A one-to-many relationship set |
D. | All of the mentioned |
Answer» A. A many-to-many relationship set |
26. |
In which of the following, a separate schema is created consisting of that attribute and the primary key of the entity set. |
A. | A many-to-many relationship set |
B. | A multivalued attribute of an entity set |
C. | A one-to-many relationship set |
D. | All of the mentioned |
Answer» B. A multivalued attribute of an entity set |
27. |
Suppose the user finds the usage of room number and phone number in a relational schema there is confusion.This is reduced by |
A. | Unique-role assumption |
B. | Unique-key assignment |
C. | Role intergral assignment |
D. | None of the mentioned |
Answer» A. Unique-role assumption |
28. |
Designers use which of the following to tune the performance of systems to support timecritical operations? |
A. | Denormalization |
B. | Redundant optimization |
C. | Optimization |
D. | Realization |
Answer» A. Denormalization |
29. |
In the schema (dept name, size) we have relations total inst 2007, total inst 200Q:8) Which dependency have lead to this relation ? |
A. | Dept name, year->size |
B. | Year->size |
C. | Dept name->size |
D. | Size->year |
Answer» A. Dept name, year->size |
30. |
Relation dept year(dept name, total inst 2007, total inst 2008, total inst 2009). Here the only functional dependencies are from dept name to the other attributes. This relation is in |
A. | Fourth NF |
B. | BCNF |
C. | Third NF |
D. | Second NF |
Answer» B. BCNF |
31. |
Thus a _______ of course data gives the values of all attributes, such as title and department, of all courses at a particular point in time. |
A. | Instance |
B. | Snapshot |
C. | Both Instance and Snapshot |
D. | All of the mentioned |
Answer» B. Snapshot |
32. |
Representations such as the in the dept year relation, with one column for each value of an attribute, are called _______ they are widely used in spreadsheets and reports and in data analysis tools. |
A. | Cross-tabs |
B. | Snapshot |
C. | Both Cross-tabs and Snapshot |
D. | All of the mentioned |
Answer» A. Cross-tabs |
33. |
Data Model is collection of conceptual tools for describing - |
A. | Data |
B. | All of these |
C. | Data Schema |
D. | Consistency Constaints |
Answer» B. All of these |
34. |
Data Models in DBMS are classified into ______ categories. |
A. | 3 |
B. | 2 |
C. | 5 |
D. | 4 |
Answer» C. 5 |
35. |
Object based logical model(s) are used to describe data at - [Select Appropriate Option(s)] |
A. | View Level |
B. | Logical Level |
C. | Physical Level |
D. | None of these |
Answer» C. Physical Level |
36. |
Which of the following is example of Object based logical model ? |
A. | Relational Model |
B. | Hierarchical Model |
C. | Network Model |
D. | Entity Relationship Model |
Answer» D. Entity Relationship Model |
37. |
Entity Relationship model consists of collection of basic objects called _________ and relationship among these objects. |
A. | functions |
B. | models |
C. | None of these |
D. | entities |
Answer» D. entities |
38. |
Which of the following gives a logical structure of the database graphically? |
A. | Entity-relationship diagram |
B. | Entity diagram |
C. | Database diagram |
D. | Architectural representation |
Answer» A. Entity-relationship diagram |
39. |
Consider a directed line(->) from the relationship set advisor to both entity sets instructor and student. This indicates _________ cardinality |
A. | One to many |
B. | One to one |
C. | Many to many |
D. | Many to one |
Answer» B. One to one |
40. |
We indicate roles in E-R diagrams by labeling the lines that connect ___________ to __________ |
A. | Diamond , diamond |
B. | Rectangle, diamond |
C. | Rectangle, rectangle |
D. | Diamond, rectangle |
Answer» D. Diamond, rectangle |
41. |
An entity set that does not have sufficient attributes to form a primary key is termed a __________ |
A. | Strong entity set |
B. | Variant set |
C. | Weak entity set |
D. | Variable set |
Answer» C. Weak entity set |
42. |
For a weak entity set to be meaningful, it must be associated with another entity set, called the |
A. | Identifying set |
B. | Owner set |
C. | Neighbour set |
D. | Strong entity set |
Answer» A. Identifying set |
43. |
If you were collecting and storing information about your music collection, an album would be considered a(n) _____ |
A. | Relation |
B. | Entity |
C. | Instance |
D. | Attribute |
Answer» B. Entity |
44. |
What term is used to refer to a specific record in your music database; for instance; information stored about a specific album? |
A. | Relation |
B. | Instance |
C. | Table |
D. | Column |
Answer» B. Instance |
45. |
If a piece of data is stored in two places in the database, then |
A. | Storage space is wasted |
B. | Changing the data in one spot will cause data inconsistency |
C. | In can be more easily accessed |
D. | Storage space is wasted & Changing the data in one spot will cause data inconsistency |
Answer» D. Storage space is wasted & Changing the data in one spot will cause data inconsistency |
46. |
An audit trail ___________ |
A. | Is used to make backup copies |
B. | Is the recorded history of operations performed on a file |
C. | Can be used to restore lost information |
D. | None of the mentioned |
Answer» B. Is the recorded history of operations performed on a file |
47. |
Large collection of files are called ____________ |
A. | Fields |
B. | Records |
C. | Database |
D. | Sectors |
Answer» C. Database |
48. |
Which of the following hardware component is the most important to the operation of a database management system? |
A. | High resolution video display |
B. | Printer |
C. | High speed, large capacity disk |
D. | Mouse |
Answer» C. High speed, large capacity disk |
49. |
Which of the following is not true of the traditional approach to information processing |
A. | There is common sharing of data among the various applications |
B. | It is file oriented |
C. | Programs are dependent on the file |
D. | It is inflexible |
Answer» A. There is common sharing of data among the various applications |
50. |
The information about data in a database is called _______ |
A. | Metadata |
B. | Hyper data |
C. | Tera data |
D. | None of the mentioned |
Answer» A. Metadata |
51. |
A data dictionary is a special file that contains? |
A. | The names of all fields in all files |
B. | The data types of all fields in all files |
C. | The widths of all fields in all files |
D. | All of the mentioned |
Answer» D. All of the mentioned |
52. |
A relational database system needs to maintain data about the relations, such as the schema of the relations. This is called |
A. | Metadata |
B. | Catalog |
C. | Log |
D. | Dictionary |
Answer» A. Metadata |
53. |
Relational schemas and other metadata about relations are stored in a structure called the ____________ |
A. | Metadata |
B. | Catalog |
C. | Log |
D. | Data Dictionary |
Answer» D. Data Dictionary |
54. |
___________ is the collection of memory structures and Oracle background processes that operates against an Oracle database. |
A. | Database |
B. | Instance |
C. | Tablespace |
D. | Segment |
Answer» B. Instance |
55. |
A ________ is a logical grouping of database objects, usually to facilitate security, performance, or the availability of database objects such as tables and indexes. |
A. | Tablespace |
B. | Segments |
C. | Extents |
D. | Blocks |
Answer» A. Tablespace |
56. |
A tablespace is further broken down into ________ |
A. | Tablespace |
B. | Segments |
C. | Extents |
D. | Blocks |
Answer» B. Segments |
57. |
__________ is a contiguous group of blocks allocated for use as part of a table, index, and so forth. |
A. | Tablespace |
B. | Segment |
C. | Extent |
D. | Block |
Answer» C. Extent |
58. |
________ is the smallest unit of allocation in an Oracle database. |
A. | Database |
B. | Instance |
C. | Tablespace |
D. | Database Block |
Answer» D. Database Block |
59. |
An Oracle __________ is a set of tables and views that are used as a read-only reference about the database. |
A. | Database dictionary |
B. | Dictionary table |
C. | Data dictionary |
D. | Dictionary |
Answer» C. Data dictionary |
60. |
A data dictionary is created when a __________ created. |
A. | Instance |
B. | Segment |
C. | Database |
D. | Dictionary |
Answer» C. Database |
61. |
An Oracle object type has two parts the _________ and__________ |
A. | Instance and body |
B. | Segment and blocks |
C. | Specification and body |
D. | Body and segment |
Answer» C. Specification and body |
62. |
A(n) _________ can be used to preserve the integrity of a document or a message. |
A. | Message digest |
B. | Message summary |
C. | Encrypted message |
D. | None of the mentioned |
Answer» A. Message digest |
63. |
A hash function must meet ________ criteriA:) |
A. | Two |
B. | Three |
C. | Four |
D. | None of the mentioned |
Answer» B. Three |
64. |
What is the main limitation of Hierarchical Databases? |
A. | Limited capacity (unable to hold much datA:) |
B. | Limited flexibility in accessing data |
C. | Overhead associated with maintaining indexes |
D. | The performance of the database is poor |
Answer» B. Limited flexibility in accessing data |
65. |
The property (or set of properties) that uniquely defines each row in a table is called the: |
A. | Identifier |
B. | Index |
C. | Primary key |
D. | Symmetric key |
Answer» C. Primary key |
66. |
The separation of the data definition from the program is known as: |
A. | Data dictionary |
B. | Data independence |
C. | Data integrity |
D. | Referential integrity |
Answer» B. Data independence |
67. |
The traditional storage of data that is organized by customer, stored in separate folders in filing cabinets is an example of what type of ‘database’ system? |
A. | Hierarchical |
B. | Network |
C. | Object oriented |
D. | Relational |
Answer» A. Hierarchical |
68. |
The database design that consists of multiple tables that are linked together through matching data stored in each table is called |
A. | Hierarchical database |
B. | Network database |
C. | Object oriented database |
D. | Relational database |
Answer» D. Relational database |
69. |
The association role defines: |
A. | How tables are related in the database |
B. | The relationship between the class diagram and the tables in the database |
C. | The tables that each attribute is contained |
D. | Which attribute is the table’s primary key |
Answer» A. How tables are related in the database |
70. |
The purpose of an N-Ary association is: |
A. | To capture a parent-child relationship |
B. | To deal with one to many relationships |
C. | To deal with relationships that involve more than two tables |
D. | To represent an inheritance relationship |
Answer» C. To deal with relationships that involve more than two tables |
71. |
In ordered indices the file containing the records is sequentially ordered, a ___________ is an index whose search key also defines the sequential order of the file. |
A. | Clustered index |
B. | Structured index |
C. | Unstructured index |
D. | Nonclustered index |
Answer» A. Clustered index |
72. |
Indices whose search key specifies an order different from the sequential order of the file are called ___________ indices. |
A. | Nonclustered |
B. | Secondary |
C. | All of the mentioned |
D. | None of the mentioned |
Answer» C. All of the mentioned |
73. |
An ____________ consists of a search-key value and pointers to one or more records with that value as their search-key value. |
A. | Index entry |
B. | Index hash |
C. | Index cluster |
D. | Index map |
Answer» A. Index entry |
74. |
In a _______ clustering index, the index record contains the search-key value and a
|
A. | Dense |
B. | Sparse |
C. | Straight |
D. | Continuous |
Answer» A. Dense |
75. |
In a __________ index, an index entry appears for only some of the search-key values. |
A. | Dense |
B. | Sparse |
C. | Straight |
D. | Continuous |
Answer» A. Dense |
76. |
Incase the indices values are larger, index is created for these values of the index. This is called |
A. | Pointed index |
B. | Sequential index |
C. | Multilevel index |
D. | Multiple index |
Answer» C. Multilevel index |
77. |
A search key containing more than one attribute is referred to as a _________ search key. |
A. | Simple |
B. | Composite |
C. | Compound |
D. | Secondary |
Answer» B. Composite |
78. |
Insertion of a large number of entries at a time into an index is referred to as __________ of the index. |
A. | Loading |
B. | Bulk insertion |
C. | Bulk loading |
D. | Increase insertion |
Answer» C. Bulk loading |
79. |
While inserting the record into the index, if the search-key value does not appear in the index. |
A. | The system adds a pointer to the new record in the index entry |
B. | The system places the record being inserted after the other records with the same searchkey values |
C. | The system inserts an index entry with the search-key value in the index at the appropriate position |
D. | None of the mentioned |
Answer» C. The system inserts an index entry with the search-key value in the index at the appropriate position |
80. |
A collection of data designed to be used by different people is called a/an |
A. | Organization |
B. | Database |
C. | Relationship |
D. | Schema |
Answer» B. Database |
81. |
Which of the following is the oldest database model? |
A. | Relational |
B. | Deductive |
C. | Physical |
D. | Network |
Answer» D. Network |
82. |
Which of the following schemas does define a view or views of the database for particular users? |
A. | Internal schema |
B. | Conceptual schema |
C. | Physical schema |
D. | External schema |
Answer» D. External schema |
83. |
Which of the following are the process of selecting the data storage and data access characteristics of the database? |
A. | Logical database design |
B. | Physical database design |
C. | Testing and performance tuning |
D. | Evaluation and selecting |
Answer» B. Physical database design |
84. |
Which of the following terms does refer to the correctness and completeness of the data in a database? |
A. | Data security |
B. | Data constraint |
C. | Data independence |
D. | Data integrity |
Answer» D. Data integrity |
85. |
A table can be logically connected to another table by defining a |
A. | Super key |
B. | Candidate key |
C. | Primary key |
D. | Unique key |
Answer» C. Primary key |
86. |
If the state of the database no longer reflects a real state of the world that the database is supposed to capture, then such a state is called |
A. | Consistent state |
B. | Parallel state |
C. | Durable state |
D. | Inconsistent state |
Answer» D. Inconsistent state |
87. |
Ensuring isolation property is the responsibility of the |
A. | Recovery-management component of the DBMS |
B. | Concurrency-control component of the DBMS |
C. | Transaction-management component of the DBMS |
D. | Buffer management component in DBMS |
Answer» B. Concurrency-control component of the DBMS |
88. |
Relational Algebra is a __________ query language that takes two relations as input and produces another relation as an output of the query. |
A. | Relational |
B. | Structural |
C. | Procedural |
D. | Fundamental |
Answer» C. Procedural |
89. |
For select operation the ________ appear in the subscript and the ___________ argument appears in the paranthesis after the sigmA:) |
A. | Predicates, relation |
B. | Relation, Predicates |
C. | Operation, Predicates |
D. | Relation, Operation |
Answer» A. Predicates, relation |
90. |
The ___________ operation, denoted by −, allows us to find tuples that are in one relation but are not in another. |
A. | Union |
B. | Set-difference |
C. | Difference |
D. | Intersection |
Answer» B. Set-difference |
91. |
In precedence of set operators, the expression is evaluated from |
A. | Left to left |
B. | Left to right |
C. | Right to left |
D. | From user specification |
Answer» B. Left to right |
92. |
Which one of the following is a set of one or more attributes taken collectively to uniquely identify a record? |
A. | Candidate key |
B. | Sub key |
C. | Super key |
D. | Foreign key |
Answer» C. Super key |
93. |
Consider attributes ID, CITY and NAME. Which one of this can be considered as a super key? |
A. | NAME |
B. | ID |
C. | CITY |
D. | CITY, ID |
Answer» B. ID |
94. |
A _____ is a property of the entire relation, rather than of the individual tuples in which each tuple is unique. |
A. | Rows |
B. | Key |
C. | Attribute |
D. | Fields |
Answer» B. Key |
95. |
An attribute in a relation is a foreign key if the _______ key from one relation is used as an attribute in that relation. |
A. | Candidate |
B. | Primary |
C. | Super |
D. | Sub |
Answer» B. Primary |
96. |
The relation with the attribute which is the primary key is referenced in another relation. The relation which has the attribute as a primary key is called ______________ |
A. | Referential relation |
B. | Referencing relation |
C. | Referenced relation |
D. | Referred relation |
Answer» C. Referenced relation |
97. |
The ______ is the one in which the primary key of one relation is used as a normal attribute in another relation. |
A. | Referential relation |
B. | Referencing relation |
C. | Referenced relation |
D. | Referred relation |
Answer» C. Referenced relation |
98. |
A _________ integrity constraint requires that the values appearing in specified attributes
|
A. | Referential |
B. | Referencing |
C. | Specific |
D. | Primary |
Answer» A. Referential |
99. |
A relational database consists of a collection of |
A. | Tables |
B. | Fields |
C. | Records |
D. | Keys |
Answer» A. Tables |
100. |
A ________ in a table represents a relationship among a set of values. |
A. | Column |
B. | Key |
C. | Row |
D. | Entry |
Answer» C. Row |
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