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There is a system that gives its users many advantages, which make easier to work with data connected with sales invoices or general ledger charges. Users now can receive a common data model of all the data of interest. What is more the system does not bother itself about the source of the data. In addition the data warehouse has little side and do not need much source in the computer. This makes the value of the system enhance.
The data warehouse system deals with business applications and manages customer relationships. However, it is not an easy task to design and implement the system. A lot of attention is paid to this aspect. Managers of the companies usually expect that the designers of the system would unite all the enterprise data, so that they could get any answers to any their questions. This is connected with many difficulties, but sounds incredible and is possible.
There are some points to which the designers pay all their attention. First of them is how to start the data warehouse. The second is where to start the system. They must think carefully over many details. The most difficult task is to make the data of great projects small and therefore manageable. It is very popular among some designers to build data marts. It is an initial stage before making the real data warehouse. It is well known that we need to have something smaller in order to be able to manage it.
If you want to design data warehouse, you may follow the next methods:
You should decide what is the subject on which the data warehouse design has to be based;
There is the fact table. You need to make decision on what it would represent;
Choose the dimensions;
Identify the facts;
Pre-calculate everything and put them in the fact table;
Do the defining of the definitions and tables carefully;
Figure out the duration of the database and frequency of up gradation;
Follow the dimensional changes;
Choose the query priorities and their models.
After that you can implement a data warehouse. Direction in which the system works is from simple to complex. At the beginning only some data marts could be spotted. Than the rest of the system is implemented.
There are some drawbacks connected with technological side of the system which is especially vividly seen when designing and implementing the system. There different aspects, such as hardware base for the system, platforms for system management and operating, DBMS, tools for running the system, etc.
What is more, designers should also pay attention to financial side of the data warehousing system. It takes much time to make the system, therefore, it is very expensive.
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