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Solved MCQ on Database Backup and Recovery in DBMS set-1

0

1) Which of the following is not a recovery technique?

A. Deferred update

B. Immediate update

C. Two-phase commit

D. Recovery management


2)Checkpoints are a part of

A. Recovery measures

B. Security measures

C. Concurrency measures

D. Authorization measures


3) ....... deals with soft errors, such as power failures.

A. system recovery

B. media recovery

C. database recovery

D. failure recovery


4) ........... is an essential part of any backup system.

A. Filter

B. Recovery

C. Security

D. Scalability


5) Media recovery deals with ...........

A. disk errors

B. hard errors

C. system errors

D. power failures


6) For a backup/restore system, ............. is a prerequisite for service in a enterprise.

A. Filter

B. Recovery

C. Security

D. Scalability


7) Failure recovery and media recovery fall under ........

A. transaction recovery

B. database recovery

C. system recovery

D. value recovery


8) The .......... consists of the various applications and database that play a role in a backup and recovery strategy.

A. Recovery Manager environment

B. Recovery Manager suit

C. Recovery Manager file

D. Recovery Manager database


9) In which the database can be restored up to the last consistent state after the system failure?

A. Backup

B. Recovery

C. Both

D. None



10) A ........... is a block of Recovery Manager(RMAN)job commands that is stored in the recovery catalogue.

A. recovery procedure

B. recovery block

C. stored block

D. stored script


11) In log based recovery, the log is sequence of .........

A. filter

B. records

C. blocks

D. numbers


12) The enrolling of a database in a recovery catalogue is called .........

A. set up

B. registration

C. start up

D. enrolment



13) .......... is an alternative of log based recovery.

A. Disk recovery

B. Shadow paging

C. Dish shadowing

D. Crash recovery



14) Most backup and recovery commands in ........... are executed by server sessions.

A. Backup Manager

B. Recovery Manager

C. Backup and Recovery Manager

D. Database Manager


15) ........ systems typically allows to replace failed disks without stopping access to the system.

A. RAM

B. RMAN

C. RAD

D. RAID



16) An ......... is an exact copy of a single datafile, archived redo log file, or control file.

A. image copy

B. datafile copy

C. copy log

D. control copy



17) .......... known as memory-style error correcting-code(ECC) organization, employs parity bits.

A. RAID level 1

B. RAID level 2

C. RAID level 3

D. RAID level 4



18) The remote backup site is sometimes called the .......... site.

A. primary

B. secondary

C. ternary

D. None of the above



19) EXP command is used ...........

A. to take Backup of the Oracle Database

B. to import data from the exported dump file

C. to create Rollback segments

D. to create Schedule.



20) The simplest approach to introducing redundancy is to duplicate every disk is called .....

A. mirroring

B. imaging

C. copying

D. All of the above

Answers:

1) C. Two-phase commit
2) A. Recovery measures
3) D. failure recovery
4) C. Security
5) A. disk errors
6) D. Scalability
7) C. system recovery
8) A. Recovery Manager environment
9) B. Recovery
10) D. stored script
11) B. records
12) B. registration
13) B. Shadow paging
14) B. Recovery Manager
15) D. RAID
16) A. image copy
17) B. RAID level 2
18)  B. secondary
19) A. to take Backup of the Oracle Database 
20) A. mirroring


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Solved MCQ on Distributed Database Transaction Management set-4

0

1) Commit and rollback are related to ..........

A. data integrity

B. data consistency

C. data sharing

D. data security


2) The transaction wants to edit the data item is called as .......

A. Exclusive Mode

B. Shared Mode

C. Inclusive Mode

D. Unshared Mode


3) For committing a transaction, the DBMS might discard all the records.

A. after image

B. before image

C. log

D. redo log


4) A sophisticated locking mechanism known as 2-phase locking which includes Growing phase and .......

A. Shrinking Phase

B. Release phase

C. Commit phase

D. Acquire Phase


5) A Transaction ends

A. only when it is Committed.

B. only when it is Rolled-back

C. when it is Committed or Rolled-back

D. only when it is initialized


6) In .........., each transactions there is a first phase during which new lock are acquired.

A. Shrinking Phase

B. Release phase

C. Commit phase

D. Growing Phase


7) A transaction processing system is also called as .......

A. processing monitor

B. transaction monitor

C. TP monitor

D. monitor


8) The transactions are always ......... if it always locks a data item in shared mode before reading it.

A. well formed

B. well distributed

C. well locked

D. well shared


9) .......... servers which is widely used in relational database systems.

A. Data servers

B. Transaction servers

C. Query servers

D. Client servers


10) If a distributed transactions are well-formed and 2-phasedlocked, then ................ is the correct locking mechanism in distributed transaction as well as in centralized databases.

A. two phase locking

B. three phase locking

C. transaction locking

D. well-formed locking


11) ......... property will check whether all the operation of a transaction completed or none.

A. Atomicity

B. Consistency

C. Isolation

D. Durability


12) The total ordering of operations across groups ensures ...........of transactions.

A. serializability

B. synchronizability

C. atomicity

D. durability


13) In which state, the transaction will wait for the final statement has been executed?

A. Active

B. Failed

C. Aborted

D. partially committed


14) The ORDER concurrency control technique is based on the property.

A. ordering mechanism

B. inherent ordering

C. total ordering

D. partial ordering


15) Transactions per rollback segment is derived from .....

A. Db_Block_Buffers

B. Processes

C. shared_Pool_size

D. buffers


16) The ............is responsible for ensuring correct execution in the presence of failures.

A. Database Manager

B. Transaction Manager

C. Recovery Manager

D. Executive Manager


17) A distributed transaction can be ............. if queries are issued at one or more nodes.

A. fully read-only

B. partially read-only

C. fully read-write

D. partially read-write


18) The distributed transaction can be completely read-only and the transaction is started with a .......... READ ONLY statement.

A. DISTRIBUTED_TRANSACTIONS

B. TRANSACTION

C. SET TRANSACTION

D. READ TRANSACTION


19) The initialization parameter ................. controls the number of possible distributed transactions in which a given instance can concurrently participate, both as a client and a server.

A. DISTRIBUTED_TRANSACTIONS

B. TRANSACTION

C. SET TRANSACTION

D. CONTROL TRANSACTION


20) A database administrator can manually force the COMMIT or ROLLBACK of a local ............ distributed transaction.

A. in-force

B. in-doubt

C. in-local

D. in-manual

Answers:

1) B. data consistency
2) A. Exclusive Mode
3) B. before image
4) A. Shrinking Phase
5) C. when it is Committed or Rolled-back
6) D. Growing Phase
7) C. TP monitor
8) A. well formed
9) B. Transaction servers
10) A. two phase locking
11) A. Atomicity
12) A. serializability
13) D. partially committed
14) C. total ordering
15) B. Processes
16) A. Database Manager
17) B. partially read-only
18) C. SET TRANSACTION
19) A. DISTRIBUTED_TRANSACTIONS
20) B. in-doubt


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Solved MCQ on Oracle Distributed Transaction set-3

0

1) A mechanism which ensures that simultaneous execution of more than one transaction does not lead to any database inconsistencies is called .................. mechanism.

A. transaction control

B. transaction management

C. concurrency parallelism

D. concurrency control


2) The transaction wants only to read the data item of mode is called as .......

A. Exclusive Mode

B. Shared Mode

C. Inclusive Mode

D. Unshared Mode


3) Any execution of a set of transactions is called as its .........

A. non-serial schedule

B. serial schedule

C. schedule

D. interleaved schedule


4) ............ is program or set of program that interacts with the database at some point in its execution.

A. A database system

B. A database application

C. Both

D. none


5) .......... component of a database is responsible for ensuring atomicity and durability.

A. recovery management

B. concurrency control

C. storage management

D. query evaluation engine


6) The activity of ensuring atomicity in the presence of Transaction aborts is called ..........

A. transaction control

B. transaction management

C. transaction recovery

D. concurrency control


7) A .............is a set of rules that state when a transaction may lock or unlock each of the data items in the database

A. concurrency control

B. transaction control

C. validation control

D. locking protocol


8) ..................  is a collection of programs performing all necessary action associated with a database.

A. Database associated

B. Database administrator

C. Database application

D. Database management system


9) Which protocol permits release of exclusive locks only at the end of transaction?

A. Graph based protocol

B. Strict two phase locking protocol

C. Two phase locking protocol

D. Rigorous Two phase locking protocol


10) The activity of providing Durability of the transaction is called .....

A. database control

B. transaction management

C. transaction recovery

D. database recovery


11) Which protocol allows a transaction to lock a new data item only if that transaction has not yet unlocked data item?

A. Graph based protocol.

B. Strict two phase locking protocol

C. Two phase locking protocol

D. Time stamp ordering scheme


12) .......... is a collection of application programs that interacts with the database along with DBMS.

A. A database system

B. A database application

C. Database administration

D. Data system


13) ........ ensures that once transaction completes successfully, the results of the operations become permanent.

A. serializability

B. synchronizability

C. atomicity

D. durability


14) A ....... contains information for undoing or redoing all the actions performed by the transactions.

A. save point

B. log

C. node

D. commit_point


15) A ............. is a unit of program execution that accesses and possibly updates various data items.

A. DBMS

B. monitor

C. transaction

D. transistor


16) Transaction is an action used to perform some manipulation on data stored in the ........

A. Memory

B. Record

C. Database

D. All of these


17) A transaction is terminated if it has ........

A. aborted

B. committed

C. running state

D. aborted or committed


18) The two possible communication errors are, Lost messages and .......

A. Network Partitions

B. Lost acknowledgement

C. Timeout

D. log error


19) The only way to undo the effects of a committed transaction is to execute a .......

A. committed transaction

B. compensating transaction

C. supplementary transaction

D. update query


20) In .........., one or more users/programs attempt to access the same data at the same time.

A. concurrency

B. transaction control

C. locking

D. two phase locking

Answers:

1) D. concurrency control
2) B. Shared Mode
3) C. schedule
4) B. A database application
5) A. recovery management
6) C. transaction recovery
7) D. locking protocol
8) D. Database management system
9) B. Strict two phase locking protocol
10) D. database recovery
11) C. Two phase locking protocol
12) A. A database system
13) D. durability
14) B. log
15) C. transaction
16) C. Database
17) C. running state
18) A. Network Partitions
19) B. compensating transaction
20) A. concurrency


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Solved MCQ on Transaction Management in DBMS set-2

0

1) In the ............, one transaction inserts a row in the table while the other transaction is half way through its browsing of table.

A. transaction read problem

B. one way read problem

C. serial read problem

D. phantom read problem


2) Transaction processing is associated with everything below except.

A. producing detail, summery, or exception reports

B. recording a business activity

C. confirming an action or triggering a response

D. maintaining data


3) .......... helps solve concurrency problem.

A. locking

B. transaction monitor

C. transaction serializability

D. two phase commit


4) If a transaction acquires a shared lock, then it can perform .......... operation.

A. read

B. write

C. read and write

D. update


5) If a transaction obtains a shared lock on a row, it means that the transaction wants to ..... that row.

A. write

B. insert

C. execute

D. read


6) The node where the distributed transaction originates is called the .......

A. local coordinator

B. starting coordinator

C. global coordinator

D. originating node


7) If a transaction obtains an exclusive lock on a row, it means that the transaction wants to ....... that row.

A. select

B. update

C. view

D. read


8) If a transaction acquires exclusive lock, then it can perform .......... operation.

A. read

B. write

C. read and write

D. update


9) ........ is a specific concurrency problem wherein two transactions depend on each other for something.

A. phantom read problem

B. transaction read problem

C. deadlock

D. locking


10) If a database server is referenced in a distributed transaction, the value of its commit point strength determines which role it plays in the .........

A. two phase commit

B. two phase locking

C. transaction locking

D. checkpoints


11) Transaction .......... ensures that the transaction are being executed successfully.

A. concurrency

B. consistency

C. serialisability

D. non serialiasability


12) The situation in which a transaction holds a data item and waits for the release of data item held by some other transaction, which in turn waits for another transaction, is called .......

A. serialiable schedule

B. process waiting

C. concurrency

D. deadlock


13) ............ protocol grantees that a set of transactions becomes serialisable.

A. two phase locking

B. two phase commit

C. transaction locking

D. checkpoints


14) The global coordinator forgets about the transaction phase is called .........

A. Prepare phase

B. Commit phase

C. Forget phase

D. Global phase


15) In two phase commit, .......... coordinates the synchronization of the commit or rollback operations.

A. database manager

B. central coordinator

C. participants

D. concurrency control manager


16) In two-phase locking protocol, a transaction obtains locks in ........phase.

A. shrinking phase

B. growing phase

C. running phase

D. initial phase


17) A transaction processing system is also called as ........

A. processing monitor

B. transaction monitor

C. TP monitor

D. monitor


18) After the nodes are prepared, the distributed transaction is said to be ......

A. in-doubt

B. in-prepared

C. prepared transaction

D. in-node


19) In .........., we have many mini transactions within a main transaction.

A. transaction control

B. chained transaction

C. nested transaction

D. calling transaction


20) In a two-phase locking protocol, a transaction release locks in ......... phase.

A. shrinking phase

B. growing phase

C. running phase

D. initial phase

Answers:

1) D. phantom read problem
2) C. confirming an action or triggering a response
3) A. locking
4) A. read
5) D. read
6) C. global coordinator
7) B. update
8) C. read and write
9) C. deadlock
10) A. two phase commit
11) C. serialisability
12) D. deadlock
13) A. two phase locking
14) C. Forget phase
15) B. central coordinator
16) B. growing phase
17) C. TP monitor
18) A. in-doubt
19) B. chained transaction
20) A. shrinking phase

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Solved MCQ on Distributed Transaction Management set-1

0

1) If the transaction is rolled back, all the database changes made inside the transaction are ......

A. made permanent

B. made temporary

C. copied to the log

D. undone


2) Which of the following is not a property of transactions?

A. Atomicity

B. Concurrency

C. Isolation

D. Durability


3) A ......... ensures that transactions are performed as expected.

A. transaction processing monitor

B. transaction procedure monitor

C. isolation monitor

D. transaction log


4) A transaction that completes its execution successfully is said to be .......

A. committed

B. rolled back

C. partially committed

D. Aborted


5) ........ means that a transaction must execute exactly once completely or not at all.

A. durability

B. consistency

C. atomicity

D. isolation


6) 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


7) ........... means that when it ends, a transaction must leave the database in a consistent state.

A. Data isolation

B. Data duration

C. Data consistency

D. Data non-reputability


8) The number of transactions executed in a given amount of time is called .........

A. utilization

B. execution rate

c. throughput

D. atomicity


9) Isolation means ......

A. transaction must not interfere with each other

B. transaction must interfere with each other

C. transaction must be in consistent state

D. transaction must be executed immediately


10) Which of the following ensures the atomicity of the transaction?

A. Transaction management component of DBMS

B. Application Programmer

C. Concurrency control component of DBMS

D. Recovery management component of DBMS


11) ........ means that a transaction must make its changes permanent to the database ends.

A. isolation

B. locking

C. durability

D. consistency


12) Throughput means

A. number of transactions that are committed in one hour

B. number of operations in a transaction

C. number of transaction that can be aborted in a given amount of time

D. number of transaction that can be executed in a given amount of time


13) ........ deals with individual transactions.

A. isolate transactions

B. transaction recovery

C. system recovery

D. media recovery


14) The part of a database management system which ensures that the data remains in a consistent state is

A. authorization and integrity manager

B. buffer manager

C. transaction manager

D. file manager


15) ......... protocol is used to perform multiple transactions that execute on different database.

A. commit

B. two phase lock

C. two phase commit

D. locking


16) A transaction can do read and write operation on a data item when it acquires ......

A. read mode

B. exclusive mode

C. shared mode

D. write mode


17) In .......... one transaction overwrites the changes of another transaction.

A. uncommitted read problem

B. lost update problem

C. update lost problem

D. dirty read problem


18) Isolation of the transactions is ensured by

A. Transaction management

B. Application programmer

C. Concurrency control

D. Recovery management


19) In dirty read problem .......

A. one transaction reads an uncommitted value of another transaction

B. one transaction reads the committed value for another transaction

C. one transaction reads another transaction

D. one transaction commits another transaction.


20) A transaction can do only read operation and not write operation on a data item when it acquires ....... lock.

A. read mode

B. exclusive mode

C. shared mode

D. write mode

Answers:

1) D. undone
2) B. Concurrency
3) A. transaction processing monitor
4) A. committed
5) C. atomicity
6) C. It will immediately be granted 
7) C. Data consistency
8) c. throughput
9) A. transaction must not interfere with each other
10) A. Transaction management component of DBMS
11) C. durability
12) D. number of transaction that can be executed in a given amount of time
13) B. transaction recovery
14) C. transaction manager
15) C. two phase commit
16) B. exclusive mode
17) B. lost update problem 
18) C. Concurrency control
19) A. one transaction reads an uncommitted value of another transaction
20) C. shared mode


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Solved MCQ on Fundamental of DBMS set-10

0

1) 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


2) Field is otherwise called as ......... of the record

A. data item

B. data type

C. value

D. variable


3) A table can have only one

A. Secondary key

B. Alternate key

C. Unique key

D. Primary key


4) A field can be called as ........... in relation context.

A. random file

B. direct file

C. attribute

D. tuple


5) In the relational modes, cardinality is termed as

A. Number of tuples

B. Number of attributes

C. Number of tables

D. Number of constraints


6) The ........ is used for creating and destroying table, indexes and other forms of structures.

A. data manipulation language

B. data control language

C. transaction control language

D. data definition language


7) The view of total database content is

A. Conceptual view

B. Internal view

C. External view

D. Physical view


8) The ............ refers to the way data is organized in and accessible from DBMS.

A. database hierarchy

B. data organization

C. data sharing

D. data model


9) Architecture of the database can be viewed as

A. two levels

B. four levels

C. three levels

D. one level


10) ........ introduced the relational database rules.

A. Atul kahate

B. James Gossling

C. EF Codd

D. Dennies Rithchie


11) In a relational model, relations are termed as

A. Tuples

B. Attributes

C. Tables

D. Rows


12) When the values in one or more attributes being used as a foreign key must exist in another set of one or more attributes in another table, we have created a(n) ........

A. transitive dependency

B. insertion anomaly

C. referential integrity constraint

D. normal form


13) In the architecture of a database system external level is the

A. physical level

B. logical level

C. conceptual level

D. view level


14) A functional dependency is a relationship between or among .......

A. tables

B. rows

C. relations

D. attributes


15) Related fields in a database are grouped to form a

A. data file

B. data record

C. menu

D. bank


16) .......... is, a table have more than one set of attributes that could be chosen as the key

A. foreign key

B. integrity key

C. relationship

D. candidate key


17) The database environment has all of the following components except.

A. users

B. separate files

C. database

D. database administrator


18) The operation of eliminating columns in a table done by ........ operation.

A. Restrict

B. Project

C. Union

D. Divide


19) 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. sub schema


20) ....... is a condition specified on a database schema and restricts the data that can be stored in an instance of the database.

A. Key Constraint

B. Check Constraint

C. Foreign key constraint

D. integrity constraint


Answers:

1) B. Tree like structure
2) A. data item
3) D. Primary key
4) C. attribute
5) A. Number of tuples
6) D. data definition language
7) A. Conceptual view
8) D. data model
9) C. three levels
10) C. EF Codd
11) C. Tables
12) C. referential integrity constraint
13) D. view level
14) D. attributes
15) B. data record
16) D. candidate key
17) A. users
18) B. Project
19) D. sub schema
20) B. Check Constraint


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Solved MCQ Questions on Structured Query Language set-6

0

1) ......keyword is used to eliminate the duplicates.

A. distinct

B. unique

C. union

D. intersect


2) ..........is a query that has another query embedded within it.

A. sub query

B. structured query

C. nested query

D. sequence query


3) Which of the following is not an aggregate operator?

A. MAX

B. MIN

C. TOTAL

D. AVG


4) Any SQL statement inside an embedded SQL program must be inside the boundaries of ....

A. EXE SQL and END

B. EXEC SQL and END

C. EXEC and END-EXEC

D. EXEC SQL and END-EXEC


5) In embedded SQL, the per-compiler translates the SQL statements inside the code blocks into the appropriate ....

A. PL/SQL block

B. SQL * plus

C. 3GL statements

D. equivalent C code blocks


6) ........ accepts multiple rows a SQL query, stores them and hands over them one by one to the 3GL program.

A. database program

B. database cursor

C. database object

D. database constraints


7) The ........... is useful in the case of online application.

A. embedded SQL

B. PL/SQL

C. static SQL

D. dynamic SQL


8) What is the Role of revoke command?

A. To give privilege

B. To get back privilege

C. To execute the query

D. To run the program


9) The clause ALTER TABLE in SQL can be used to

A. add an attribute

B. delete an attribute

C. alter the default values of an attribute

D. all of the above


10) Which of the following operations need the participating relations to be union compatible?

A. UNION

B. INTERSECTION

C. DIFFERENCE

D. All of the above



11) ........ is a virtual table that draws its data from the result of an SQL SELECT statement.

A. View

B. Synonym

C. Sequence

D. Transaction


12) In SQL, which of the following is not a data definition language commands?

A. RENAME

B. REVOKE

C. GRANT

D. UPDATE


13) In SQL, which command(s) is(are) used to change a table's storage characteristics?

A. ALTER TABLE

B. MODIFY TABLE

C. CHANGE TABLE

D. All of the above


14) Which command will delete all data from a table and will not write to the rollback segment?

A. DROP

B. DELETE

C. CASCADE

D. TRUNCATE


15) Which is not part of the Data Definition Language?

A. CREATE

B. ALTER

C. ALTER SESSION

D. CREATE SESSION


16) What operator tests column for the adsence of data?

A. IS Null operator

B. ASSIGNMENT operator

C. LIKE operator

D. NOT operator


17) NOT BETWEEN 10 AND 20 ......

A. displays NULL values

B. does not display NULL values

C. may display NULL values

D. display values


18) Which of the following SQL commands can be used to add data to a database table?

A. ADD

B. UPDATE

C. APPEND

D. INSERT


19) ........ can be used to retrieve data from multiple table.

A. Embedded SQL

B. Dynamic SQL

C. Joins

D. Views


20) .......... privides option for entering SQL queries at execution time, rather than at the development stage.

A. PL/SQL

B. SQL * Plus

C. SQL

D. Dynamic SQL



Answers:


1) A. distinct
2) C. nested query
3) C.TOTAL
4) D. EXEC SQL and END-EXEC
5) C. 3GL statements
6) B. database cursor
7) D. dynamic SQL
8) B. To get back privilege
9) D. all of the above
10) D. All of the above
11) A. View
12) D. UPDATE
13) A. ALTER TABLE
14) B. DELETE
15) C. ALTER SESSION
16) A. IS Null operator
17) B. does not display NULL values
18) D. INSERT
19) C. Joins
20) D. Dynamic SQL


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MCQ on Database Design with Answer set-1

0

1) What is a 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.


2) As per equivalence rules for query transformation, selection operation distributes over

A. Union

B. Intersection

C. Set difference

D. All of the above


3) 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


4) Which of the following relational algebraic operations is not from set theory?

A. Union

B. Intersection

C. Cartesian Product

D. Select


5) 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


6) In case of entity integrity, the primary key may be

A. not Null

B. Null

C. both Null and not Null

D. any value


7) A logical schema

A. is the entire database.

B. is a standard way of organizing information into accessible parts.

C. describes how data is actually stored on disk

D. both A and C


8) 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


9) Which of the following is another name for weak entity?

A. Child

B. Owner

C. Dominant

D. All of the above


10) Which of the following is record based logical model?

A. Network Model

B. Object oriented model

C. E-R model

D. None of the above



11) A file manipulation command that extracts some of the records from a file is called

A. SELECT

B. PROJECT

C. JOIN

D. PRODUCT


12) In E-R Diagram derived attribute are represented by

A. Ellipse

B. Dashed ellipse

C. Rectangle

D. Triangle


13) 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


14) In E-R diagram relationship type is represented by

A. Ellipse

B. Dashed ellipse

C. Rectangle

D. Diamond


15) In E-R diagram generalization is represented by

A. Ellipse

B. Dashed ellipse

C. Rectangle

D. Triangle


16) A table joined with itself is called

A. Join

B. Self Join

C. Outer Join

D. Equi Join


17) ........... means multiple copies of the same data items.

A. Data reduction

B. Data integrity

C. Data consistency

D. Data redundancy


18) Different values for the same data item is referred to as .......

A. data consistency

B. data inconsistency

C. data integrity

D. data duplication


19) The .......... returns row after combining two tables based on common values.

A. difference

B. product

C. join

D. union


20) The .......... can be used to ensure database integrity.

A. entity integrity

B. database constraints

C. referential integrity

D. cardinality

Answers:

1) B. It is the data contained in database that is accurate and consistent.
2) All of the above
3) A. inner join
4) D. Select
5) B. weak entity set
6) A. not Null
7) A. is the entire database.
8) C. Relational algebra
9) Child
10) A. Network Model
11) A. SELECT
12) B. Dashed ellipse
13) D. Combination of projection and Cartesian product
14) D. Diamond
15) D. Triangle
16) B. Self Join
17) D. Data redundancy
18) B. data inconsistency
19) C. join
20) B. database constraints

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