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PROGRAM-Mca
SEMESTER-IV
SUBJECT
CODE & NAME-mca5043– Data Warehousing and Data Mining
CREDIT-4
BK
ID-B1633
MAX.
MARKS-60
Q1.
What is a data warehouse? Mention its advantages.
Answer:
A Data Warehouse is a relational database that is designed for query and
analysis rather than for transaction processing.
It
usually contains historical data derived from transaction data, but it can include
data from other sources. It separates analysis workload from
Q2.
What is metadata? Describe data marts.
Answer:
Metadata is data that describes other
data. Meta is a prefix that in most information technology usages means
"an underlying definition or
Q3.
Differentiate E-R modeling and dimensional modeling.
Answer:
In the
E-R modeling
Q4.
Explain the relation between data warehousing and data mining.
Answer:
Relation
between Data Warehousing and Data Mining
The
connection between data warehouse and data mining is indisputable. Popular
business organizations use these technologies together. The current section
describes the relation between data warehouse and data mining. Data mining is
concerned with finding hidden relationships present in business data to allow
businesses to make predictions for future use. It is the process of data-driven
extraction of not so obvious but useful information from large databases. Data
mining has emerged as a key business intelligence technology. Data Mining is a
multi disciplinary field drawing works from statistics, database technology,
artificial intelligence, pattern recognition, machine learning,
5.
Describe K-means method for clustering. List its advantages and drawbacks. 5+5
Answer.
K-means method for clustering
k-means clustering
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 as hyper text .The
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