Introduction to Data warehousing
Have you ever thought why Google, Facebook, Twitter and many other websites are position at the top rank? Have you ever thought how Wall mart, Reliance and other shopping marts are making profits? Have you ever analyzed the ways ebay, flipkart, Snapdeal and other online stores follows to achieve higher revenue each year? There is a single answer for all these questions and it is “Data warehousing and Business Intelligence”. With this you must get to know the power of this word “DATA”. Data warehousing provides the enterprise with Memory and Data Mining provides the enterprise with Intelligence.
“Data warehousing is a concept and it provides an architectural model for the flow of data from Operational data System to Decision support system.”
Earlier, we were dependent only on Transactional Processing System (TPS) also known as Real-time processing. TPS was used for business transactions to collect daily transactional data. All day-to-day transactions were captured and stored into the database. Then, the point of concern for Business people or Decision makers was to have high network bandwidth to send data to distributed platforms on daily basis and Business Intelligence was given low priority. But until what time can the need of Business intelligence and Data warehousing be ignored.
In 1970’s, Business experts sensed the need of Data warehousing and Business Intelligence and that sense has now become the essence of each organization. With the analysis of the data stored at the Data warehouse, Decision makers can view the immediate impact on the bottom line and top line of the organization. Also, it provides greater insight of customers which helps the organization to retain them and gives better visibility of the organization.
Need for Data warehousing
Today’s mantra of success is “Proactive use Information than Optimization”. This is a world of competition and organizations start focusing on utilizing data they collects from day-to-day transactions. Organizations realize the Importance of information they hold, to improve decision making and achieve profits. But, Operational systems were never designed to perform these intelligent activities and probably never can be. So, this arouses a need of such a system which is mature enough to support decision makers and analyze business process. As said by Plato (a Greek philosopher) – “Necessity is the mother of Invention”, this need leads to the development of a system known as Decision Support System (DSS) i.e. Data warehouse. Let’s gain more information on these two systems i.e. TPS and DSS.
Transaction-processing systems are designed to capture information and to be updated quickly. They are constantly changing and are often online 24 hours a day.
Examples of Transaction-processing systems include order entry systems, scanner-based point-of-sale registers, automatic teller machines, and airline reservation applications.
Decision-support systems are designed to allow analysts to extract information quickly and easily. The data being analyzed is often historical – daily, weekly, and yearly results.
Examples of Decision-support systems include applications for analysis of sales revenue, marketing information, insurance claims, and catalog sales.
Problem with Data warehousing
You must have read a line from a great poet, William Shakespeare – “Water, water, everywhere nor any drop to drink”. It means in sea there is water all around but you cannot drink that saline water. In the same way, Data warehouse contains volume of data but part of it is important to you that you have to look.
- I can’t find the data I need – Data is scattered over the network.
- I can’t get the data I need – Need an expert to get the data.
- I can’t understand the data I found – Available data is poorly documented.
- I can’t use the data I found – Data need to be transformed from one form to another.
Apart from these issues, Cost is the major drawback because Data warehousing is a very costly process and requires huge amount of data for Analysis and Reporting processes.
Benefits of Data warehousing
Data warehousing is a concept of merging data from heterogeneous data sources into one database. Organizations spend vast resources in terms of human resource as well as financial resource for implementing Data warehouse. Why the companies invest so much into this? What is the benefit of spending resources on storing data? Let’s see the benefits provided by Data warehousing to the organization.
- It facilitates Strategic Planning and considered as a backbone of organizations. Business People get to know market’s trend and can make better decisions.
- It provides an option of Better Data Analysis as Data from varied sources is grouped into Data marts. Companies can analyze data in a better way by querying on multiple dimensions (Multi Dimensional Query).
- It provides flexibility in Operation Systems as it operates separately from other operation processes, Data retrieval can be done with ease without affecting other operation requirements.
- It helps in identifying and resolving dirty data, with dirty data I mean to say Inconsistent data. All the dirty/inconsistent data is resolved and a homogenous data is then grouped into Database. As a result, Data Retrieval and Data Analysis process gets simplified.
- It helps to improve Decision making process as it provides market trends and forecast.
- It is used to enhance Customer service and provide better enterprise intelligence.
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