1) In the context of data warehousing, data map or ‘data about data’ is known as …………….
a) tuple
b) attribute
c) metadata
d) teradata
2) Which of the following normal form deals with the anomaly of multivalue dependency?
a) 1NF
b) 2NF
c) 4NF
d) 5NF
3) Which of the following normal form deals with the repeating group anomaly?
a) 1NF
b) 2NF
c) 4NF
d) 5NF
4) …………… is a database language used to define data structures in SQL?
a) Sybase
b) Oracle
c) DDL
d) MySQL
5) The ………………… is a database file that contains metadata.
a) data index
b) data repository
c) data dictionary
d) none
6)Which of the following is not the state of a transaction in the database?
a) Active
b) Committed
c) Terminated
d) Nullified
7) The …………… file saves the recovery scenario in Quick Test Professional (QTP) environment
a) QRS
b) JPEG
c) DOC
d) TSR
8) Which of the following is not a command is SQL?
a) WHERE
b) ORDER BY
c) REMOVE
d) SELECT
9) How should we traverse an oracle database to retrieve a row in the quickest possible time?
a) Full table scan
b) Unique index
c) Primary key
d) Table access by row id
10) Which of the following is a concurrency control protocol?
a) Locked-based protocol
b) two-phase locking protocol
c) Timestamp ordering protocol
d) all
11) Which of the following normal forms deals with the anomaly of partial functional dependency on the composite key?
a) 1NF
b) 2NF
c) 4NF
d) 5NF
12) ………………… represents the structure of the database in a formal language acceptable by the DBMS.
a) Database schema
b) ER diagram
c) Database table
d) None
13) Which of the following statements are used to create indexes in the database?
a) CREATE INDEX
b) BUILD INDEX
c) WRITE INDEX
d) None’
14)Which of the following is a database recovery technique?
a) Check-pointing
b) Transaction rollback
c) Shadow paging
d) All
15)Which of the following is a foreing key constraint?
a)Referential integrity
b) Domain integrity
c) Entity integrity
d) All
16) Which of the following trains are important to select a primary key?
a) Unique
b) Not Null
c) Fully functional dependency
d) Indexed
e) All
17) What are various types of DBMS?
a) ORBDMS
b) Client server DBMS
c) Distributed DBMS
d) OODBMS
e) All
18) Which of the following are the types of integrity constraints enforced by RDBMS?
a) Entity integrity
b) Domain integrity
c) Referential integrity
d) All
19) The data model which describes how the data is actually stored is :
a) internal model
b) external model
c) logical model
d) none of these
20) Data about data is normally termed as :
a) directory
b) data bank
c) meta data
d) none of the above
21. In an object-oriented model, one object can access data of another object by passing:
a. Instance variable
b. Message
c. Variable
d. None of these
22. A view of database that appears to an application program is known as:
a. Schema
b. Subschema
c. virtual table
d. none of the above
23. An abstraction concept for building composite object from their component object is called:
a. Specialization
b. Normalization
c. Generalization
d. Aggregation
24. A set of objects that share a common structure and
a common behavior is called:
a. Object
b. Class
c. Entity
d. None of these
25. Every weak entity set can be converted into a strong entity set by:
a. using generalization
b. adding appropriate attributes
c. using aggregation
d. none of the above
26. The number of entities to which another entity can be associated via a relationship set is expressed as:
a. Entity
b. Cardinality
c. Schema
d. Attributes
27. Relations produced from an E-R model will always be in:
a. First normal form
b. Second normal form
c. Third normal form
d. Fourth normal form
28. In ER model the details of the entities are hidden from the user. This process is called:
a. Generalization
b. Specialization
c. Abstraction
d. none of these above
29. The file organization that provides very fast access to any arbitrary record of a file is:
a. Ordered file
b. Unordered file
c. Hashed file
d. B-tree
30. What is not true about a view?
a. It is a definition of a restricted portion of the database
b. It is a security mechanism
c. It is always updatable like any other table
d. All are true
31. In a relational database a referential integrity constraint can be specified with the help of
a. primary key
b. foreign key
c. secondary key
d. none of the above
32. A super key is a set of one or more attributes that, taken collectively, allow us
a. to identify uniquely an entity in the entityset
b. to make the key most powerful for fasterretrieval
c. to increase effectiveness of database access
d. none of the above
33. 4NF is designed to cope with:
a. Transitive dependency
b. Join dependency
c. Multi valued dependency
d. None of these
34. Every Boyee-Codd normal form is in
a. First normal form
b. Second normal form
c. Third normal form
d. All of the above
35. Which command is used to remove all rows from a table?
a. Delete
b. Remove
c. Truncate
d. Both [A] and [B]
36. Which of the following is an aggregate function in SQL?
a. Union
b. Like
c. Group By
d. Max
37. Which command is used to add a column to an existing table?
a. Create
b. Update
c.Alter
d. None of these
38. A deadlock exists in the system if and only if the wait for graph:
a. has a cycle in it
b. has a path from first node to last node
c. is a tree
d. none of the above
39. Rollback of transactions is normally used to:
a. recover from transaction failure
b. update the transaction
c. retrieve old records
d. repeat a transaction
40. Prevention of access to the database by unauthorized users is referred to as:
a. Integrity
b. Productivity
c. Security
d. Reliability
Showing posts with label Metadata. Show all posts
Showing posts with label Metadata. Show all posts
Friday, October 09, 2020
Friday, September 18, 2020
Database Systems MCQ
Q.1 Which of the following relational algebra operations do not require the participating tables to be union-compatible?
(A) Union
(B) Intersection
(C) Difference
(D) Join
Ans: (D)
Q.2 Which of the following is not a property of transactions?
(A) Atomicity
(B) Concurrency
(C) Isolation
(D) Durability
Ans: (B)
Q.3 Relational Algebra does not have
(A) Selection operator.
(B) Projection operator.
(C) Aggregation operators.
(D) Division operator.
Ans: (C)
Q.4 Checkpoints are a part of
(A) Recovery measures.
(B) Security measures.
(C) Concurrency measures.
(D) Authorization measures.
Ans: (A)
Q.5 Tree structures are used to store data in
(A) Network model.
(B) Relational model.
(C) Hierarchical model.
(D) File based system.
Ans: (C)
Q.6 The language that requires a user to specify the data to be retrieved without specifying exactly how to get it is
(A) Procedural DML.
(B) Non-Procedural DML.
(C) Procedural DDL.
(D) Non-Procedural DDL.
Ans: (B)
Q.7 Precedence graphs help to find a
(A) Serializable schedule.
(B) Recoverable schedule.
(C) Deadlock free schedule.
(D) Cascadeless schedule.
Ans: (A)
Q.8 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.
Ans: (A) The rule that a value of a foreign key must appear as a value of some specific table is called a referential constraint. (Referential integrity constraint is concerned with foreign key)
Q.9 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
Ans: (B) 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 ORDER BY. (ORDER BY clause is used to arrange the result of the SELECT statement)
Q.10 What is a disjoint less constraint?
(A) It requires that an entity belongs to no more than one level entity set.
(B) The same entity may belong to more than one level.
(C) The database must contain an unmatched foreign key value.
(D) An entity can be joined with another entity in the same level entity set.
Ans: (A) Disjoint less constraint requires that an entity belongs to no more than one level entity set. (Disjoint less constraint means that an entity can be a member of at most one of the subclasses of the specialization.)
Q.11 According to the levels of abstraction, the schema at the intermediate level is called
(A) Logical schema.
(B) Physical schema.
(C) Subschema.
(D) Super schema.
Ans: According to the levels of abstraction, the schema at the intermediate level is called conceptual schema. (Note: All the options given in the question are wrong.)
Q.12 It is an abstraction through which relationships are treated as higher level entities
(A) Generalization.
(B) Specialization.
(C) Aggregation.
(D) Inheritance.
Ans: (C ) It is an abstraction through which relationships are treated as higher level entities Aggregation. (In ER diagram, aggregation is used to represent a relationship as an entity set.)
Q.13 A relation is in ____________ if an attribute of a composite key is dependent on an attribute of other composite key.
(A) 2NF
(B) 3NF
(C) BCNF
(D) 1NF
Ans: (B) A relation is in 3 NF if an attribute of a composite key is dependent on an attribute of other composite key. (If an attribute of a composite key is dependent on an attribute of other composite key then the relation is not in BCNF, hence it has to be decomposed.)
Q.14 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.
Ans: (B) (Data integrity means that the data must be valid according to the given constraints. Therefore, the data is accurate and consistent.)
Q.15 What are the desirable properties of a decomposition
(A) Partition constraint.
(B) Dependency preservation.
(C) Redundancy.
(D) Security.
Ans: (B) What are the desirable properties of a decomposition – dependency preserving. (Lossless join and dependency preserving are the two goals of the decomposition.)
Q.16 In an E-R diagram double lines indicate
(A) Total participation.
(B) Multiple participation.
(C) Cardinality N.
(D) None of the above.
Ans: (A)
Q.17 The operation which is not considered a basic operation of relational algebra is
(A) Join.
(B) Selection.
(C) Union.
(D) Cross product.
Ans: (A)
Q.18 Fifth Normal form is concerned with
(A) Functional dependency.
(B) Multivalued dependency.
(C) Join dependency.
(D) Domain-key.
Ans: (C)
Q.19 Block-interleaved distributed parity is RAID level
(A) 2.
(B) 3
(C) 4.
(D) 5.
Ans: (D)
Q.20 Immediate database modification technique uses
(A) Both undo and redo.
(B) Undo but no redo.
(C) Redo but no undo.
(D) Neither undo nor redo.
Ans: (A)
Q.21 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.
Ans: (B)
Q.22 Which of the following is not a consequence of concurrent operations?
(A) Lost update problem.
(B) Update anomaly.
(C) Unrepeatable read.
(D) Dirty read.
Ans: (B)
Q.23 As per equivalence rules for query transformation, selection operation distributes over
(A) Union.
(B) Intersection.
(C) Set difference.
(D) All of the above.
Ans: (D)
Q.24 The metadata is created by the
(A) DML compiler
(B) DML pre-processor
(C) DDL interpreter
(D) Query interpreter
Ans: (C)
Q.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
Ans: (B)
Wednesday, June 03, 2020
Database management quiz
In the relational model, cardinality is termed as:
A) A number of tuples.
B) A number of attributes.
C) A number of tables.
D) A number of constraints.
ANSWER: A
Relational calculus is a
A) Procedural language.
B) Non- Procedural language.
C) Data definition language.
D) High-level language.
ANSWER: B
The view of total database content is
A) Conceptual view.
B) Internal view.
C) External view.
D) Physical View.
ANSWER: A
Cartesian product in relational algebra is
A) a Unary operator.
B) a Binary operator.
C) a Ternary operator.
D) not defined.
ANSWER: B
DML is provided for
A) Description of the logical structure of a database.
B) The addition of new structures in the database system.
C) Manipulation & processing of the database.
D) Definition of a physical structure of the database system.
ANSWER: C
‘AS’ clause is used in SQL for
A) Selection operation.
B) Rename operation.
C) Join operation.
D) Projection operation.
ANSWER: B
ODBC stands for
A) Object Database Connectivity.
B) Oral Database Connectivity.
C) Oracle Database Connectivity.
D) Open Database Connectivity.
ANSWER: D
Architecture of the database can be viewed as
A) two levels.
B) four levels.
C) three levels.
D) one level.
ANSWER: C
In a relational model, relations are termed as
A) Tuples.
B) Attributes
C) Tables.
D) Rows.
ANSWER: c
The database schema is written in
A) HLL
B) DML
C) DDL
D) DCL
ANSWER: C
In the architecture of a database system external level is the
A) physical level.
B) logical level.
C) conceptual level
D) view level.
ANSWER: D
An entity set that does not have sufficient attributes to form a primary key is a
A) strong entity set.
B) weak entity set.
C) simple entity set.
D) primary entity set.
ANSWER: B
In an E-R diagram attributes are represented by
A) rectangle.
B) square.
C) ellipse.
D) triangle.
ANSWER: C
In case of entity integrity, the primary key maybe
A) not Null
B) Null
C) both Null & not Null.
D) any value.
ANSWER: A
The language used in application programs to request data from the DBMS is referred to as the
A) DML
B) DDL
C) VDL
D) SDL
ANSWER: A
A logical schema
A) is the entire database.
B) is a standard way of organising information into accessible parts.
C) describes how data is actually stored on disk.
D) both (A) and (C)
ANSWER: A
Related fields in a database are grouped to form a
A) data file.
B) data record.
C) menu.
D) bank.
ANSWER: B
The database environment has all of the following components except:
A) users.
B) separate files.
C) database.
D) database administrator.
ANSWER: A.
The language which has recently become the defacto standard for interfacing application programs with relational database system is
A) Oracle.
B) SQL.
C) DBase.
D) 4GL.
ANSWER: B
The way a particular application views the data from the database that the application uses is a
A) module.
B) relational model.
C) schema.
D) subschema.
ANSWER: D
In an E-R diagram an entity set is represent by a
A) rectangle.
B) ellipse.
C) diamond box.
D) circle.
ANSWER: A
A report generator is used to
A) update files.
B) print files on paper.
C) data entry.
D) delete files.
ANSWER: B
The property/properties of a database is/are:
A) It is an integrated collection of logically related records.
B) It consolidates separate files into a common pool of data records.
C) Data stored in a database is independent of the application programs using it.
D) All of the above.
ANSWER: D
The DBMS language component which can be embedded in a program is
A) The data definition language (DDL).
B) The data manipulation language (DML).
C) The database administrator (DBA).
D) A query language.
ANSWER: B
A relational database developer refers to a record as
A) Criteria.
B) a relation.
C) a tuple.
D) an attribute.
ANSWER: C
The relational model feature is that there
A) is no need for primary key data.
B) is much more data independence than some other database models.
C) are explicit relationships among records.
D) are tables with many dimensions.
ANSWER: B
Conceptual design
A) is a documentation technique.
B) needs data volume and processing frequencies to determine the size of the database.
C) involves modelling independent of the DBMS.
D) is designing the relational model.
ANSWER: C
The method in which records are physically stored in a specified order according to a key field in each record is
A) hash.
B) direct.
C) sequential.
D) all of the above.
ANSWER: A
A subschema expresses
A) the logical view.
B) the physical view.
C) the external view.
D) all of the above.
ANSWER: C
Count function in SQL returns the number of
A) values.
B) distinct values.
C) groups.
D) columns.
ANSWER: A
Which one of the following statements is false?
A) The data dictionary is normally maintained by the database administrator.
B) Data elements in the database can be modified by changing the data dictionary.
C) The data dictionary contains the name and description of each data element.
D) A data dictionary is a tool used exclusively by the database administrator.
ANSWER: B
An advantage of the database management approach is
A) data is dependent on programs.
B) data redundancy increases.
C) data is integrated and can be accessed by multiple programs.
D) none of the above.
ANSWER: C
A DBMS query language is designed to
A) support end users who use English-like commands.
B) support in the development of complex applications software.
C) specify the structure of a database.
D) all of the above.
ANSWER: D
Transaction processing is associated with everything below except
A) producing detail, summary, or exception reports.
B) recording a business activity.
C) confirming an action or triggering a response.
D) maintaining data.
ANSWER: C
It is possible to define a schema completely using
A) VDL and DDL.
B) DDL and DML.
C) SDL and DDL.
D) VDL and DML.
ANSWER: B
The method of access which uses key transformation is known as
A) direct.
B) hash.
C) random.
D) sequential.
ANSWER: B
Data independence
A) data is defined separately and not included in programs.
B) programs are not dependent on the physical attributes of data.
C) programs are not dependent on the logical attributes of data.
D) both (B) and (C).
ANSWER: D both (B) and (C)
The statement in SQL which allows changing the definition of a table is
A) Alter.
B) Update.
C) Create.
D) select.
ANSWER: A.
E-R model uses this symbol to represent a weak entity set?
A) Dotted rectangle.
B) Diamond
C) Doubly outlined rectangle
D) None of these
ANSWER: C
Relational Algebra is
A) Data Definition Language.
B) Meta Language
C) Procedural query Language
D) None of the above
ANSWER: C
Key to represent the relationship between tables is called
A) Primary key
B) Secondary Key
C) Foreign Key
D) None of these
ANSWER: C
_______ produces the relation that has attributes of R1 and R2
A) Cartesian product
B) Difference
C) Intersection
D) Product
ANSWER: A
The file organisation that provides very fast access to any arbitrary record of a file is
A) Ordered file
B) Unordered file
C) Hashed file
D) B-tree
ANSWER: C
DBMS helps achieve
A) Data independence
B) Centralised control of data
C) Neither (A) or (B)
D) both (A) and (B)
ANSWER: D
Which of the following are the properties of entities?
A) Groups
B) Table
C) Attributes
D) Switchboards
ANSWER: C
In a relation
A) Ordering of rows is immaterial
B) No two rows are identical
C) (A) and (B) both are true
D) None of these.
ANSWER: C
Which of the following is correct:
A) a SQL query automatically eliminates duplicates.
B) SQL permits attribute names to be repeated in the same relation.
C) a SQL query will not work if there are no indexes on the relations
D) None of these
ANSWER: D
It is better to use files than a DBMS when there are
A) Stringent real-time requirements.
B) Multiple users wish to access the data.
C) Complex relationships among data.
D) All of the above.
ANSWER: B
The conceptual model is
A) dependent on hardware.
B) dependent on software.
C) dependent on both hardware and software.
D) independent of both hardware and software.
ANSWER: D
What is a relationship called when it is maintained between two entities?
A) Unary
B) Binary
C) Ternary
D) Quaternary
ANSWER: B
Which of the following is a valid SQL type?
A) CHARACTER
B) NUMERIC
C) FLOAT
D) All of the above
ANSWER: D
The RDBMS terminology for a row is
A) tuple.
B) relation.
C) attribute.
D) degree.
ANSWER: A
The full form of DDL is
A) Dynamic Data Language
B) Detailed Data Language
C) Data Definition Language
D) Data Derivation Language
ANSWER: C
Which of the following is an advantage of view?
A) Data security
B) Derived columns
C) Hiding of complex queries
D) All of the above
ANSWER: D
Which of the following is a legal expression in SQL?
A) SELECT NULL FROM EMPLOYEE;
B) SELECT NAME FROM EMPLOYEE;
C) SELECT NAME FROM EMPLOYEE WHERE SALARY = NULL;
D) None of the above
ANSWER: B
The users who use the easy-to-use menu are called
A) Sophisticated end users.
B) Naïve users.
C) Stand-alone users.
D) Casual end users.
ANSWER: B
Which are the two ways in which entities can participate in a relationship?
A) Passive and active
B) Total and partial
C) Simple and Complex
D) All of the above
ANSWER: B
The result of the UNION operation between R1 and R2 is a relation that includes
A) all the tuples of R1
B) all the tuples of R2
C) all the tuples of R1 and R2
D) all the tuples of R1 and R2 which have common columns
ANSWER: D
Which of the following is a comparison operator in SQL?
A) =
B) LIKE
C) BETWEEN
D) All of the above
ANSWER: D
A set of possible data values is called
A) attribute.
B) degree.
C) tuple.
D) domain.
ANSWER: D
Which of the operations constitute a basic set of operations for manipulating relational data?
A) Predicate calculus
B) Relational calculus
C) Relational algebra
D) None of the above
ANSWER: C
Which of the following is another name for the weak entity?
A) Child
B) Owner
C) Dominant
D) All of the above
ANSWER: A
Which of the following database object does not physically exist?
A) base table
B) index
C) view
D) none of the above
ANSWER: C
NULL is
A) the same as 0 for integer
B) the same as blank for character
C) the same as 0 for integer and blank for character
D) not a value
ANSWER: D
Which of the following is a record based logical model?
A) Network Model
B) Object-oriented model
C) E-R Model
D) None of these
ANSWER: A
A data dictionary is a special file that contains:
A) The name of all fields in all files.
B) The width of all fields in all files.
C) The data type of all fields in all files.
D) All of the above.
ANSWER: D
A file manipulation command that extracts some of the records from a file is called
A) SELECT
B) PROJECT
C) JOIN
D) PRODUCT
ANSWER: A
The physical location of a record is determined by a mathematical formula that transforms a file key into a record location is:
A) B-Tree File
B) Hashed File
C) Indexed File
D) Sequential file.
ANSWER: B
A primary key is combined with a foreign key creates
A) Parent-Child relationship between the tables that connect them.
B) Many to many relationships between the tables that connect them.
C) Network model between the tables that connect them.
D) None of the above.
ANSWER: A
In E-R Diagram derived attribute is represented by
A) Ellipse
B) Dashed ellipse
C) Rectangle
D) Triangle
ANSWER: B
An instance of relational schema R (A, B, C) has distinct values of A, including NULL values. Which one of the following is true?
A) A is a candidate key
B) A is not a candidate key
C) A is a primary Key
D) Both (A) and (C)
ANSWER: B
The natural join is equal to:
A) Cartesian Product
B) Combination of Union and Cartesian product
C) Combination of selection and Cartesian product
D) Combination of projection and Cartesian product
ANSWER: D
Which one of the following is not true for a view:
A) A view is derived from other tables.
B) A view is a virtual table.
C) A view definition is permanently stored as part of the database.
D) The view never contains derived columns.
ANSWER: C
A primary key, if combined with a foreign key, creates
A) Parent-Child relationship between the tables that connect them.
B) Many to many relationships between the tables that connect them.
C) Network model between the tables that connect them.
D) None of the above.
ANSWER: A
In E-R Diagram relationship type is represented by
A) Ellipse
B) Dashed ellipse
C) Rectangle
D) Diamond
ANSWER: D
Hierarchical model is also called
A) Tree structure
B) Plex Structure
C) Normalise Structure
D) Table Structure
ANSWER: A
To delete a particular column in a relation the command used is:
A) UPDATE
B) DROP
C) ALTER
D) DELETE
ANSWER: C
The ______ operator is used to compare a value to a list of literals values that have been specified.
A) BETWEEN
B) ANY
C) IN
D) ALL
ANSWER: A
A logical schema
A) is the entire database
B) is a standard way of organising information into an accessible part
C) describe how data is actually stored on disk
D) none of these
ANSWER: D
_____________ function divides one numeric expression by another and returns the remainder.
A) POWER
B) MOD
C) ROUND
D) REMAINDER
ANSWER: B
A data manipulation command the combines the records from one or more tables is called
A) SELECT
B) PROJECT
C) JOIN
D) PRODUCT
ANSWER: C
In E-R diagram generalisation is represented by
A) Ellipse
B) Dashed ellipse
C) Rectangle
D) Triangle
ANSWER: D
_________ is a virtual table that draws its data from the result of an SQL SELECT statement.
A) View
B) Synonym
C) Sequence
D) Transaction
ANSWER: A
A table joined with itself is called
A) Join
B) Self Join
C) Outer Join
D) Equi Join
ANSWER: B
_________ data type can store unstructured data
A) RAW
B) CHAR
C) NUMERIC
D) VARCHAR
ANSWER: A
A relational database consists of a collection of
A) Tables
B) Fields
C) Records
D) Keys
ANSWER: A
The term _______ is used to refer to a row.
A) Attribute
B) Tuple
C) Field
D) Instance
ANSWER: B
Database __________ , which is the logical design of the database, and the database _______,which is a snapshot of the data in the database at a given instant in time.
A) Instance, Schema
B) Relation, Schema
C) Relation, Domain
D) Schema, Instance
ANSWER: D
A domain is atomic if elements of the domain are considered to be ____________ units.
A) Different
B) Indivisbile
C) Constant
D) Divisible
ANSWER: B
The tuples of the relations can be of ________ order.
A) Any
B) Same
C) Sorted
D) Constant
ANSWER: A
Entity is a
A) Object of relation
B) Present working model
C) Thing in real world
D) Model of relation
ANSWER: C
The descriptive property possessed by each entity set is _________ .
A) Entity
B) Attribute
C) Relation
D) Model
ANSWER: B
The attribute AGE is calculated from DATE_OF_BIRTH . The attribute AGE is
A) Single valued
B) Multi valued
C) Composite
D) Derived
ANSWER: D
Which of the following is a single valued attribute
A) Register_number
B) Address
C) SUBJECT_TAKEN
D) Reference
ANSWER:A
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
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) Both a and b
ANSWER: D
Large collection of files are called ____________ .
A) Fields
B) Records
C) Database
D) Sectors
ANSWER: C
Which of these data models is an extension of relational data model?
A) Object-oriented data model
B) Object-relational data model
C) Semi structured data model
D) None of the mentioned
ANSWER: B
The information about data in a database is called _______.
A) Metadata
B) Hyper data
C) Tera data
D) None of the mentioned
ANSWER: A
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
The DBMS acts as an interface between what two components of an enterprise-class database system?
A) Database application and the database
B) Data and the database
C) The user and the database application
D) Database application and SQL
ANSWER: A
A data dictionary is created when a __________ created.
A) Instance
B) Segment
C) Database
D) Dictionary
ANSWER: C
________ is the smallest unit of allocation in an Oracle database.
A) Database
B) Instance
C) Tablespace
D) Database Block
ANSWER: D
A tablespace is further broken down into ________
A) Tablespace
B) Segments
C) Extents
D) Blocks
ANSWER: B
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
The entity relationship set is represented in E-R diagram as
A) Double diamonds
B) Undivided rectangles
C) Dashed lines
D) Diamond
ANSWER: D
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
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
Which one of the following cannot be taken as a primary key ?
A) Id
B) Register number
C) Dept_id
D) Street
ANSWER: D
A 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
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
For each attribute of a relation, there is a set of permitted values, called the ________ of that attribute.
A) Domain
B) Relation
C) Set
D) Schema
ANSWER: A
The tuples of the relations can be of ________ order.
A) Any
B) Same
C) Sorted
D) Constant
ANSWER: A
Database __________ , which is the logical design of the database, and the database _______,which is a snapshot of the data in the database at a given instant in time.
A) Instance, Schema
B) Relation, Schema
C) Relation, Domain
D) Schema, Instance
ANSWER: D
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