Question: write the answer by the keyboard 3. a) What are some of the defining characteristics of OLAP (OnLine Analytical Processing) as against OLTP? [4] b)

write the answer by the keyboard

3. a) What are some of the defining characteristics of OLAP (OnLine Analytical Processing) as against OLTP? [4] b) Identify and describe the three stages of ETL. [9] c) The MDM (Multi-Dimensional Model) employs the Star Schema by default. Discuss the reasons for re-organising a Star Schema into a Snowflake Schema. [4] d) Discuss with an example why re-organising the Attributes of a Dimension into a Hierarchy of Levels supports the querying of a Cube. [4] e) Suggest two reasons why we might choose ROLAP (Relational OLAP) for Cube Storage? [4]

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