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4

Consider the join of a relation R with relation S. If R has m tuples and S has n tuples,
then the maximum size of join is:

A. mn

B. m+n

C. m+n)/2

D. 2 m+n)

Correct Answer :

A. mn


Related Questions

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Disk storage is referred to as

A. sequential access storage

B. direct access storage

C. random access storage

D. none of the above

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The left outer join takes all tuples

A. in the left relation which didnt match with any tuple in right relation

B. in the left relation which matched with a tuple in right relation

C. in the right relation which didnt match with any tuple in left relation

D. in the right relation which matched with a tuple in left relation

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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)

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Extended Entity Relationship model consists of which of the following
i) Specialization
ii) Generalization
iii) Categorization

A. i and ii only

B. ii and iii only

C. i and iii only

D. All i, ii iii

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In two-phase locking

A. the data items are locked in growing phase.

B. the data items are released in shrinking phase.

C. Both A and B are true

D. Both A and B are false

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EEPROM

A. Electrically Extractable Programmable Read Only Memory

B. Electrically Erasable Programmable Read Only Memory

C. Electronically Erasable Programmable Read Only Memory

D. Electrically Erasable Programmable Read Only Memory

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4

Which of the following is not a database object?

A. index

B. sequence

C. cursor

D. trigger

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Only one communication channel is needed rather than n channels to transmit data between two communicating devices

A. parallel

B. serial

C. analog

D. digital

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Select the incorrect statement(s)
i) Shared locks are compatible with each other.
ii) A relation which is in 3NF may have redundancy due to composite keys.
iii) A table in a database can have multiple indexes.

A. i only

B. ii, only

C. ii, iii only

D. none of the above

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4

Transaction access data using two operations

A. read(), print()

B. read(), write()

C. scan(), write()

D. none of the above

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4

QBE

A. Query By Execution

B. Query By Example

C. Query By Extraction

D. None of the above.

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Data independence means

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).

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4

The statement
Every foreign-key value must match a primary-key value in an associated table
Is related to

A. View

B. Cursor defination

C. Referential intergrity

D. Trigger

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4

Log into a computer across an internet

A. IMAP

B. TELNET

C. POP3

D. Infrared

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Secondary storage

A. magnetic disk

B. magnetic tape

C. juke box

D. cache

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DBMS utility which allows to reconstruct the correct state of database from the backup and history of transactions

A. Backup

B. Recovery

C. Grant

D. Troubleshooting

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Which of the following works as a filter?

A. UPDATE

B. DROP

C. ALTER

D. SELECT

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Aggregate functions are also called

A. serial functions

B. non-serial functions

C. row functions

D. column functions

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The method of access which uses key transformation is known as

A. direct.

B. hash.

C. random.

D. sequential.

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The statement in SQL which allows to change the definition of a table is

A. Select

B. Update

C. Create

D. Alter

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Which of the following is/are error-free channel(s)
i) Noisy channel
ii) Noiseless channel

A. i only

B. ii only

C. Both

D. None of these

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4

Which one of the following is provided by a data dictionary ?

A. User data

B. Database structure data

C. Sorted data

D. Functional data

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.................. means sending a digital signal over a channel without changing the digital signal to an analog signal.

A. Baseband transmission

B. Broadband transmission

C. Digital transmission

D. Analog transmission

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Which of the following is also known as Offline storage ?

A. primary storage

B. secondary storage

C. tertiary storage

D. none of the above

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Which of the following normalization is needed, if an attribute of a composite key is dependent on an attribute of the other composite key?

A. BCNF

B. Second

C. Third

D. Fourth

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4

Functional dependencies are generalization of

A. Relation dependencies

B. Data dependencies

C. key dependencies

D. none of the above

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Which of the following concurrency control schemes is not based on serializability property?

A. Two-phase locking

B. Timestamped based locking

C. Graph-based locking

D. none of the above

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Which of the following is not an Aggregate function?

A. Min

B. Max

C. Select

D. Avg

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4

The host part in a class A type of an IP address has

A. 12 bits

B. 16 bits

C. 24 bits

D. 28 bits

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In an E-R diagram attributes are represented by

A. rectangle.

B. square.

C. ellipse.

D. triangle.