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4

A data dictionary contains:
i) The name of all fields in all files.
ii) The data type of all fields in all files.
iii) The width of all fields in all files.

A. only i)

B. only i) and ii)

C. only ii) and iii)

D. i) ii) iii)

Correct Answer :

D. i) ii) iii)


Related Questions

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4

The race condition occurs when

A. Two concurrent processes attempt to interact with each other.

B. Two concurrent processes interact with different data files.

C. Two concurrent processes attempt to hold a data item .

D. none of the above.

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4

In two-phase locking protocol the two phases are

A. growing phase and shrinking phase

B. execution phase and blocking phase.

C. running phase and sleeping phase.

D. none of the above

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4

Secondary storage

A. magnetic disk

B. magnetic tape

C. juke box

D. cache

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4

Which of the following is logical topology?

A. Bus

B. Ring

C. Star

D. None of these

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4

Related fields in a database are grouped to form a

A. data file.

B. data record.

C. menu.

D. bank.

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4

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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4

An entity set which have sufficient attributes to form a primary key

A. Tree structure

B. Subtree structure

C. Strong entity set

D. Table structure

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4

A relation that has no partial dependencies is in which normal form

A. First

B. Second

C. Third

D. BCNF

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4

............... noise is caused by the random motion of the electrons in a wire and is avoidable.

A. Thermal

B. Intermodulation

C. Cross talk

D. Impulse

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4

The union of primary keys of a related entity becomes …………. Of a relation.

A. primarykey

B. superkey

C. candidatekey

D. foreignkey

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4

Range variables are designed using the

A. TO clause

B. FROM clause

C. RANGE clause

D. none of the above

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4

Volatile storage

A. loses its contents when power is switched off.

B. doesnt loses its contents when power is switched off.

C. creates backup when power is switched off.

D. none

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4

Symbol to represent weak entity set in ER Model

A. Dotted rectangle

B. Square

C. Doubly outlined rectangle

D. Diamond

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4

Which of the following submit and execute query at run time?

A. Static SQL

B. Dynamic SQL

C. both

D. none of these

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4

Radio frequencies below ............. are more suitable for omnidirectional applications.

A. 300MHz

B. 1GHz

C. 5GHz

D. 10 GHz

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4

In client/server computing data are

A. sent only upon the client's request

B. sent in complete copies for the client to filter and sort

C. never sent to the client machine

D. sent in very large sections to save processing time

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4

In which of the following transmissions, we can send data by grouping n bits at a time instead of a single bit?

A. parallel

B. serial

C. analog

D. digital

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4

which of the following is a binary operation?

A. project

B. select

C. rename

D. none of the above

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4

Specialization is a

A. top-down approach.

B. bottom-up approach.

C. left-right approach.

D. none of the above

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4

As a side-effect of database update ,the system automatically executes a statement called

A. a view

B. a grant permission

C. a trigger

D. all of the above

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4

Data fragmentation is performed by the …… and each fragment is stored at…………..

A. DBMS, same site

B. OS ,same site

C. DBMS ,different site

D. OS ,different site

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4

Which of the following is the unit of signaling speed or modulation rate or the rate of symbol transmission?

A. Data rate

B. Bit rate

C. Signal to Noise Ratio

D. Baud rate

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4

Data integrity refers to

A. the uniqueness of the data in a database

B. the correctness and completeness of the data in a database

C. the un redundancies of the data in a database

D. Data independence of the database

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4

Select the incorrect statement

A. View is derived from other tables.

B. Once a transaction has executed commit work its effect cant be undone by rollback work .

C. The input to the aggregate function avg can be non numeric data types

D. A primary key can never be null.

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4

A transaction which completes successfully is called

A. Granted

B. Committed

C. Compensated

D. Accomplished

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4

Query processing is

A. converting data to insert in a database

B. translation of query to lower form

C. range of activities involved in extracting data from a database

D. none of the above

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4

A type of query that is placed within a WHERE or HAVING clause of another query is called

A. Super query

B. Sub query

C. Master query

D. Multi-query

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4

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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4

Count function in SQL returns the number of

A. values.

B. distinct values.

C. groups.

D. columns.

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Which of the following produces the relation that has attributes of R1 and R2

A. Cartesian product

B. Difference

C. Intersection

D. Product