In an object oriented model, one object can access data of another object by passing?
Instance variable
Variable
Message
Function
Correct Answer :
C. Message
Related Questions
The command used to delete a particular column in a relation
UPDATE
DROP
ALTER
DELETE
The ________ states that a foreign key must either match a primary key value in another relation or it must be null.
entity integrity rule
referential integrity constraint
composite attribute
action assertion
Which of the following extracts its data from the result of an SQL SELECT statement.
View
Synonym
Sequence
Transaction
The left outer join takes all tuples
in the left relation which didnt match with any tuple in right relation
in the left relation which matched with a tuple in right relation
in the right relation which didnt match with any tuple in left relation
in the right relation which matched with a tuple in left relation
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.
i only
ii, only
ii, iii only
none of the above
Every Boyce-Codd normal form is in
3NF
2NF
1NF
none of the above
In ………… paging we make copy of the current page table.
physical
logical
shadow
duplicate
In two-phase locking protocol the two phases are
growing phase and shrinking phase
execution phase and blocking phase.
running phase and sleeping phase.
none of the above
Which of the following is not an Aggregate function?
Min
Max
Select
Avg
Which of the following is also known as Offline storage ?
primary storage
secondary storage
tertiary storage
none of the above
The class based addressing is known as
Classless addressing
Classful addressing
Classified addressing
Classical addressing
RAID
Redundant Arrays of Independent Disks
Redundant Arrays of Independent Drives
Redundant Arrays of Interconnected Drives
Redundant Arrays of Interconnected Disks
An entity set that does not have sufficient attributes to form a primary key is a
strong entity set.
weak entity set.
simple entity set.
primary entity set.
Full form of CIDR
Classful Inter Domain Routing
Classless International Domain Routing
Classless Inter Domain Routing
none of these
Which of the following aggregate function doesnt ignore NULLs in its results?
COUNT
COUNT(*)
MAX
none of these
Range variables are designed using the
TO clause
FROM clause
RANGE clause
none of the above
Technique(s) used for data recovery after any failure
Logging
Recovery manager
Both A and B are true
Both A and B are false
Noisy channel has ……… .. types of protocols
two
three
four
none
UML is stands for
Universal Modeling Language
Unified Modeling Language
United Modeling Language
Uni Modeling Language
Related fields in a database are grouped to form a
data file.
data record.
menu.
bank.
Transaction processing is associated with everything below except
producing detail, summary, or exception reports.
recording a business activity.
confirming an action or triggering a response.
maintaining data.
A functional dependency between two or more non-key attributes is called
Transitive dependency
Partial transitive dependency
Functional dependency
Partial functional dependency
In which of the following transmissions, we can send data by grouping n bits at a time instead of a single bit?
parallel
serial
analog
digital
Disk storage is referred to as
sequential access storage
direct access storage
random access storage
none of the above
Cross Product is a:
Unary Operator
Binary Operator
Ternary Operator
none of the above
.................. occurs due to velocity of propagation the frequency varies. Thus various frequency components of a signal arrive at the receiver at different times.
Noise
Delay distortion
Attenuation distortion
Dispersion
The types of noiseless channels are
i) Selective Reject ARQ
ii) simplest protocol
iii) Go-Back-N ARQ
iv) Stop-and-Wait Protocol
i, ii only
ii and iv only
ii and iv only
i, iv only
.................. means sending a digital signal over a channel without changing the digital signal to an analog signal.
Baseband transmission
Broadband transmission
Digital transmission
Analog transmission
Attenuation can be also expressed in decibel dB) and commonly used because.
i) Signal strengths often fall off logarithmically
ii) Cascade losses and gains can be calculated with simple additions and subtractions
i only
ii only
Both A and B
None of the above
Thermal noise is often referred to as ............... noise, because it affects uniformly the different frequencies.
Gray
White
Blue
Black