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PROGRAM-MCA(Revised
Fall 2012)
SEMESTER-V
SUBJECT
CODE & NAME-MCA5043– Data Warehousing and Data Mining
CREDIT-4
BK
ID-B1633
MAX.
MARKS-60
1.
Explain the Functionalities and advantages of Data Warehouses. 5+5
Answer.
Functionalities
and advantages of Data Warehouses
Functionalities
A data warehouse
functions as a repository for all the data held by an organisation. The main
functions are to reduce cost of data storage, facilitate data mining, and
facilitate ability to back up data at an organisational level.
2.
Explain the Data Warehouse Kimball life cycle. 10
Answer.
Data
Warehouse Kimball life cycle
The Kimball Lifecycle is a
methodology for developing data warehouses, and has been developed over many years
by Ralph Kimball and a variety of colleagues.
The
3.
Describe about Hyper Cube and Multicube 5+5
Answer.
Hyper
Cube and Multicube
Multidimensional databases can
present their data to an application using two types of cubes: hypercubes and multicubes.
4.
List and explain the Strategies for data reduction. 5*2
Answer.
Strategies
for data reduction
Data
reduction: Obtain a
reduced representation of the data set that is much smaller in volume but yet
produces the same (or
5.
Describe K-means method for clustering. List its advantages and drawbacks. 5+5
Answer.
K-means
method for clustering
k-means clustering is a method of
vector quantization, originally from signal processing, that is popular for
cluster analysis in data mining. k-means clustering aims to partition n
observations into k clusters in which each observation belongs to the cluster
with the nearest mean, serving as a prototype of the cluster. This results in a
partitioning of the data space into Voronoi cells.
6.
Describe about Multilevel Databases and Web Query Systems 5+5
Answer.
Multilevel
Databases and Web Query Systems
Multilevel
Databases
A multilevel database system
(MDBMS) supports the application of a multilevel policy for regulating access
to the database objects. In this approach at the bottom level database the semi
structured data is stored in web repositories
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