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A key advantage of a dimensional approach is that the data warehouse is easier for the user to understand and to use. Also, the retrieval of data from the data warehouse tends to operate very quickly. [ ] Dimensional structures are easy to understand for business users, because the structure is divided into measurements/facts and context/dimensions. Facts are related to the organization’s business processes and operational system whereas the dimensions surrounding them contain context about the measurement (Kimball, Ralph 2008). In the normalized approach, the data in the data warehouse are stored following, to a degree, rules. Sentinel protection installer virus. Tables are grouped together by subject areas that reflect general data categories (e.g., data on customers, products, finance, etc.).

The normalized structure divides data into entities, which creates several tables in a relational database. When applied in large enterprises the result is dozens of tables that are linked together by a web of joins.

Furthermore, each of the created entities is converted into separate physical tables when the database is implemented (Kimball, Ralph 2008) [ ]. The main advantage of this approach is that it is straightforward to add information into the database. Some disadvantages of this approach are that, because of the number of tables involved, it can be difficult for users to join data from different sources into meaningful information and to access the information without a precise understanding of the sources of data and of the of the data warehouse. The integration of the data marts in the data warehouse is centered on the conformed dimensions (residing in 'the bus') that define the possible integration 'points' between data marts.

The actual integration of two or more data marts is then done by a process known as 'Drill across'. A drill-across works by grouping (summarizing) the data along the keys of the (shared) conformed dimensions of each fact participating in the 'drill across' followed by a join on the keys of these grouped (summarized) facts. A junk dimension is a convenient grouping of typically low-cardinality flags and indicators. By creating an abstract dimension, these flags and indicators are removed from the fact table while placing them into a useful dimensional framework. A Junk Dimension is a dimension table consisting of attributes that do not belong in the fact table or in any of the existing dimension tables. The nature of these attributes is usually text or various flags, e.g.

Non-generic comments or just simple yes/no or true/false indicators. These kinds of attributes are typically remaining when all the obvious dimensions in the business process have been identified and thus the designer is faced with the challenge of where to put these attributes that do not belong in the other dimensions. A degenerate dimension is a key, such as a transaction number, invoice number, ticket number, or bill-of-lading number, that has no attributes and hence does not join to an actual dimension table.

Lynda c sharp essential training downloads. • • • • • • – C-Sharp Essential Training English| Size: 663.51 MB (695,745,425 bytes) Category: Tutorial C# is an object-oriented language designed by Microsoft and used by systems engineers, desktop programmers, and mobile app developers the world over.