Data Mining And Data Warehouse

DATA MINING AND DATA WAREHOUSE

BY T.V.Nagaraju

K.V.Praneeth

( III/IV B. Tech- CSE ) Mail id: [email protected]

( III/IV B. Tech- CSE) Mail id: [email protected]

Dept. of Computer Science Engineering

QIS COLLEGE OF ENGINEERING & TECHNOLOGY ONGOLE.

ABSTRACT: A data warehouse is a repository of integrated information, available for queries and analysis. Data and information are extracted from non-homogeneous sources as they are generated and processed using process managers (load/warehouse/query).This makes it much easier and more efficient to run queries over data that originally came from different sources. It also enables the people to take informed decisions. Data mining draws from the data warehouse, revealing patterns of informationin historical data, in terms of customer data or any other data in ways that we never thought possible. It combines techniques like statistical analysis, data visualization, induction and neutral networks. Data mining systems improve an organization’s effectiveness, efficiency and value by increasing the usefulness of the knowledge the organization possesses. Data warehousing & Data Mining- A View:

Data warehousing- Definition:Data warehouses are built to support large cost-effective data volumes (above 100GB of database) which can be a relational database, multidimensional database, flat file, hierarchical database, object database, etc. Data warehouse- goals: The fundamental to enable user’s appropriate access to a homogenized and comprehensive view of organization. It also supports forecasting planning and decision making processes. In additional goal is to achieve information consistency provide security and adaptability. Data warehouse-process flow: The process flow is represented as follows:

1

Extract and load the data: Data extraction involves extracting the data from source systems and makes it available to the data warehouse where as data load takes extracted data and loads it into the data warehouse.

Clean and transform data: It performs the consistency checks on the loaded data, and then structures it for query performance and for minimizing the operational costs. 2

Back up and archive data: The data is being backed up regularly and also older data

is removed from the system in a format that allows it to be quickly restored if required. 3

Query management: It manages the queries and speeds them up by directing queries

to the most effective data source and also monitor the actual query profiles.

Data warehouse architecture: The architecture is made up of a number of inter- connected parts:

1

Operational database/External database layer: Operational systems process data to support critical operational needs. To do that, operational databases have been historically created to provide an efficient processing structure for a relatively small number of well-defined business transactions.

2

Information Access Layer: This is the layer that the end-user deals with directly. In particular, it represents the tools that the end-user normally uses day to day. e.g.: Excel, Lotus 1-2-3, etc.

3

Data Access Layer: The Data Access Layer of the Data Warehouse Architecture is involved with allowing the information Layer to talk to the Operational Layer.

4

Data Directory (Meta-data) Layer: Meta-data is the data about data with in the enterprise.

Record

description

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COBOL

program

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Meta-data.

Data Warehouse Architecture 1

Process Management Layer:

The Process Management Layer is involved in

scheduling the various tasks that must be accomplished to build and maintain the data warehouse and data directory.

2

Application Messaging Layer: The Application Message Layer has to do with transporting information around the enterprise-computing network. Application Message is also referred to as “Middleware”, but it can involve those just networking protocols.

3

Data Warehouse (physical) layer: The (core) Data Warehouse is where the actual data used primarily for informational uses occur. In a Physical Data Warehouse, copies, in some cases many copies, of operational and or external data are actually stored in form that is easy to access.

4

Data Stating Layer: Data staging is also called copy management or replication management, but in fact, it includes all of the processes necessary to select, edit, summarize, combine and load data warehouse and information access data from operational and/or external databases.

Data Warehouse-applications: Role of data warehouse in various application areas. 1. Marketing solutions: Marketing database, customer loyalty scheme & profiling, etc. 2. Retail: sales analysis, shrinkage analysis, promotion analysis, space planning. 3. Insurance: Product profitability analysis, orphan analysis. 4. Telephone companies: individual terrifying through call analysis, network analysis. 5. Retail banking: customer profitability analysis, customer scoring/loan decision. Data Warehouse-Future developments: Data warehousing is such a new field that it is difficult to estimate what new developments are likely to most affect it. Clearly, the development of parallel DB servers with improved query engines is likely to be one of the most important. Another new technology is data warehouses that allow for the mixing of traditional numbers, text and multi-media. The availability of improved tools for data visualization (business intelligence) will allow users to see things that could never be seen before. Data mining – definition: Data mining, “the extraction of hidden predictive information from large databases”, is a powerful new technology with great potential to help companies focus

on the most important information in their data warehouses. Data mining tools predict future trends and behaviors, allowing business to make proactive, knowledgedriven decisions. The automated, prospective analyses offered by data mining move beyond the analyses of past events provided by retrospective tools typical of decision support systems. Data mining – Supporting Technologies: Data mining can be applied in the business field, because it is supported by three technologies. Massive data collection: Databases are growing at unprecedented rates and can be larger than expected. Powerful multiprocessor computers: The need for improved computational engines can now be met. Data mining algorithms: They have been implemented as mature, reliable, understandable tools. Data Mining: Scope: Given databases of sufficient size and quality, data mining technology can generate new business opportunities by providing these capabilities: Automated prediction of trends and behaviors: Example: predictive problem is targeted marketing. Automated discovery of previously unknown patters: Data mining tools sweep through databases and identify previously hidden patterns in one step. An example is the analysis of retail sales. Data Mining-Algorithms: Some of the most common data mining algorithms in use today are two sections based on when the technique was developed and when it became ready to be used. 1. Classical Techniques: Statistics, neighborhoods and clustering that have been used for decades. Statistics: These are data driven and are used to discover patterns and build predictive models.

(a)Histograms: One of the best ways to summarize data is to provide a histogram of the data. Ex : Representing the majority of customers that are over the age of 50.

Figure – depicts customers of different ages. (b)Linear regression: In statistics, prediction is usually synonymous with regression of some form. The simplest form of regression is simple linear regression that just contains one predictors and a prediction. The relationship between the two can be

mapped on a two dimensional space. Clustering: It is the method by which like records are grouped together. Usually this is done to give the end user a high level view of what is going on in the database. There are mainly two types. Hierarchical and Non-Hierarchical Clustering: The hierarchy of clusters is usually viewed as a tree where the smallest clusters merge together to create the next highest level of clusters and so on.

Hierararchy of clusters

elongated clusters

2. Next Generations Techniques: They represent techniques such as Trees, Networks and Rules that have only been widely used since the early 1980’s. Neural Networks: Neural networks consist of a number of neurons that are interconnected--often in complex ways--and then organized into layers. Neurons are very simple processing units that compute a linear combination of a number of inputs and then perform a simple mathematical process on the result to produce an output.

Data Mining - Working Procedure: While large-scale information technology has been evolving separate transaction and analytical systems, data mining provides the link between the two. Data mining software analyzes relationships and patterns in stored transaction data based on open-ended user queries.. Generally, any of four types of relationships are sought: •

Classes: Stored data is used to locate data in predetermined groups. For example, a restaurant chain could mine customer purchase data to determine when

customers visit and what they typically order. This information could be used to increase traffic by having daily specials. •

Clusters: Data items are grouped according to logical relationships or consumer preferences. For example, data can be mined to identify market segments or consumer affinities.

•

Associations: Data can be mined to identify associations. The beer-diaper example is an example of associative mining

•

Sequential patterns: Data is mined to anticipate behavior patterns and trends. For example, an outdoor equipment retailer could predict the likelihood of a hiking shoes.

Data Mining – Architecture: To best apply these advanced techniques, they must be fully integrated with data Warehouse as well as flexible interactive business analysis tools. Many data mining tools currently operate outside of the Warehouse, requiring extra steps for extracting, importing and analyzing the data. Furthermore, when new insights require operational implementation, integration with the warehouse simplifies the application of results from data mining. The resulting analytical data warehouse can be applied to improve business processes throughout the organization. The following figure illustrates architecture for advanced analysis in a large data warehouse.

The ideal starting point is a data warehouse containing a combination of internal data tracking all customer contact coupled with external market data about competitor activity. Background information on potential customers also provides an excellent basis for prospecting. This warehouse can be implemented in a variety of relational database systems: Sybase, Oracle, Redbrick and so on. An OLAP (On-Line Analytical Processing) server enables amore sophisticated end-user business model to be applied when navigating the data ware house. The multidimensional structures allow the user to analyze the data as they want to view their business. The Data Mining Server must be integrated with the data warehouse and the OLAP server to embed ROI-focused business analysis directly into this infrastructure. As the warehouse grows with new decisions and results, the organization can continually mine the best practices and apply them to future decisions. Data mining – Applications: Some successful application areas: 1. A pharmaceutical company can analyze its recent sales and can determine which marketing

activities will have the greatest impact in future.

2. A credit card company using a small test mailing can identify the customer attributes. 3. A diversified transportation comp-any can apply data mining to identify the best prospects. 4. A large consumer package goods company can apply data mining to improve its sales process to retailers. Conclusions- Data Warehousing & Data Mining: All large organizations already have data warehouses, but they are just not managing them. In order to get most out of this period, the data warehouse planners and developers must have a clear idea of what they are looking for and then choose strategies and methods that will improve the performance and flexibility. There is a growing gap between more powerful storage and retrieval systems and the users’ ability of effectively analyzing them. As seen, both relational and OLAP technologies are used for navigating massive data warehouses. Quantifiable business benefits have been proven through the integration of data mining with current

information systems, and new products are on the horizon that will bring this integration to an even wider audience of users.

BIBILIOGRAPHY 1. www.kdnuggets.com 2. www.ultragem.com 3. info.gte.com/kdd/ 4. www.google.com 5. Data Base Management Systems by RaghuRamaKrishnan 6. Data Mining Techniques.