By Lilian Hobbs
Oracle9iR2 info Warehousing is a consultant to utilizing the information Warehouse positive aspects within the most modern models of Oracle -- Oracle 9i unencumber 1 and unencumber 2. Written by way of humans at the Oracle improvement crew that designed and applied the code, this up-to-date and extended version offers an insider's view of the way the Oracle 9i unencumber 2 software program is better used on your software. It offers an in depth examine quite a lot of issues together with: ·
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Extra info for Oracle9iR2 Data Warehousing
After normalizing the data, some redundancy may be reintroduced on columns that are not updated to improve performance. 3 A Historical Perspective In order to optimize performance for a warehouse, where the primary activity is querying the data, a new data model was needed. Ralph Kimball, the primary industry spokesperson for dimensional modeling and author of The Data Warehouse Toolkit, introduced the star schema, a new way of designing the database to facilitate OLAP processing. In order to optimize performance for a warehouse, dimensional modeling techniques are used.
Some experts believe that the warehouse should be normalized, while others think that using dimensional normal form is more appropriate. Dimensional normal form is rather interesting, because it looks like a combination of normalization and denormalization. 2, we see the difference between the two approaches for the Store dimension. 2 29 Normalized versus Dimensional Normal Form The normalized case, is also referred to as snowflaking and is where the dimension tables are designed so that repeating data is removed to their own tables, which are then linked via foreign keys.
Why spend a few million dollars for a system when you can get the same capabilities for several hundreds of thousands? For a large company, consolidation may also involve combining many decentralized data centers into fewer data centers. As a result of hardware consolidation, there are fewer systems to manage—less software to install, patch, and secure, further reducing expenses. 4 Consolidation of Data into a Single Company View As a result of systems being consolidated, the data can also be consolidated in one place, often into a data warehouse.