Explain fundamentals of Data ware housing & OLAP?

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Explain fundamentals of Data ware housing & OLAP?..

Answer / kamal

OLAP
>Online Analytical Processing (OLAP) is a popular and
powerful data analytical method.
>It explores the complex data structure and presents the
information
OLAP functionality is:
• Multidimensional -- OLAP services provide a wide
variety of possible views or a multidimensional conceptual
view of the data by supporting a dimensional aggregation
path or hierarchies and/or multiple hierarchies.
• Easy to understand -- The data mart designed for
OLAP analysis should handle any business logic and
statistical analysis that is relevant to the application
and the developer, while at the same time, keeps it easy
enough for the target user.
• Interactive -- OLAP helps the user combine business
information through comparative,. The users are allowed to
define new ad hoc calculations as part of the analysis and
can report on the data in any desired way.
• Fast -- OLAP services are usually implemented in a
multi-user client/server mode and offer consistently rapid
responses to queries, regardless of database size and
complexity.

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Explain fundamentals of Data ware housing & OLAP?..

Answer / radhakrishnan vaithilingam

Dw:historical data for related application and this is
support to decision making system.

Eg: sales manager check the total sale details for all
loaction. every location using seperate database. so we
need to merge all data in one database.

- we can use star schema or snowflake shema

OLAP : online analtical processing.

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