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research paper on normalization in dbms
basic database design concepts
basic database design concepts
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Abstract
Database Systems has a practical, hands-on approach that makes it uniquely suited to providing a strong foundation in good database design practice. Database design is more art than science. While it's true that a properly designed database should follow the normal forms and the relational model, you still have to come up with a design that reflects the business you are trying to model. This paper shows describes design process of database project.
The importance of Completing the Design Process
An important point to keep in mind is that the level of structural integrity and data integrity is in direct proportion to how thoroughly the design process is followed. The less time spent on the design process, the greater the risk of encountering problems with the database. While thoroughly following the database design process may not eliminate all of the problems you may encounter when designing a database, it will greatly help to minimize them. Also in an RDBMS software program a well-designed database is easier to implement than a poorly designed database. (Michael J. Hernandez, 1996)
Key database Design Concepts
Before a design effort can proceed full speed ahead, the designer must first take time to understand the business. Understanding the business involves understanding the entities, data, and rules within an organization, and then converting these attributes of the business into a business model. Then, the designer must have a solid comprehension of the proposed database model. Finally, the designer will convert the business model into a database model, using a design methodology, whether automated or a manual process.
(Ryan Stephens & Ronald Plew, 2002)
General Design Process
Following table list general steps of database design
Step Description
1 Requirements collection and analysis
2 Conceptual database design
3 Choice of a DBMS
4 Data model mapping (also called logical database design)
5 Physical database design
6 Database system implementation
(Elmasri, Ramez, & Navathe, Shamkant B., 1994)
Creating the application is the last step¡ªnot the first! Many developers take an idea for an application, bu...
... middle of paper ...
... levels of normalization, but the primary levels are the first, second, and third normal forms. Each level has a rule or two that must be followed. Following all of the rules will help ensure that your database is well organized and flexible.
To take an idea from inception through to fruition, you should follow a design process. This process essentially says "think before you act." Discuss rules, requirements, and objectives, and then create the final version of your normalized tables.
Reference
1. Elmasri, Ramez, & Navathe, Shamkant B., Fundamentals of Database Systems, Second Edition, Addison-Wesley Publishing Company, 1994, ISBN 0-8053-1748-1, pages 450-452.), retrieved from website http://www.ibiblio.org/faint/finosaur/db/ , Feb 06, 2005
2. Michael J. Hernandez, Database Design For Mere Mortals, Chapter 4, 1996, retrieved from UOP resource safari Tech Books Online website, Feb 06,2005
3. Ryan Stephens & Ronald Plew, Key database design concepts, 2002, retrieved from website http://searchdatabase.techtarget.com/originalContent/0,289142,sid13_gci812028,00.html, Feb 06, 2005
The next project deliverable is a robust, modernized database and data warehouse design. The company collects large amounts of website data and uses this data to analyze it for the company’s customers. This document will provide an overview of the new data warehouse along with the type of database design that has been selected for the data warehouse. Included in the appendix of this document is a graphical depiction of the logical design of the
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These are covered briefly in appendices in the text. The relational model was first proposed by E.F. Codd in 1970 and the first such systems were developed in 1970s. The relational model is now the dominant model for commercial data processing applications. The relational model can be used in both conceptual and logical database design. The basic structure in the model is a table .Tables consists of rows and columns. Relationships in the relational model are represented implicitly through common attributes between different relations.
As defined by Kroenke Database is an integrated, self-describing collection of related data. Data is stored in a uniform way, typically all in one place- for example, a single physical computer. A database maintains a description of the data it contains and the data has some relationship to other data in the databa...
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Delobel, C., C. Lecluse, and P. Richard. Databases: From Relational to Object-Oriented Systems. ITP, 1995.
For this coursework two kinds of data models can be used. The object oriented data model, Object Oriented Database Management System(OODBMS), or the relational data model, Relational Database Management System(RDBMS). The differences between these two models and the data model to be used are described in this chapter.
The database application design can be improved in a number of ways as described below:
[7] Elmasri & Navathe. Fundamentals of database systems, 4th edition. Addison-Wesley, Redwood City, CA. 2004.
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The reason for the selection of this topic is because it falls under the computer science category. We have been studying databases for four years and so the this topic area will be of great use when venturing into the cooperate world.
Databases’ have become a instrumental component within the information technology community, but securing databases has become a issue that reigns supreme throughout all industries and organizations that operate daily by utilizing the rewards offered thru their utilization. There are a number of database applications available for use, but with the use of a database: security, cost, skilled human resources, and scalability must all be factored into the overall selection process.
Databases are becoming as common in the workplace as the stapler. Businesses use databases to keep track of payroll, vacations, inventory, and a multitude of other taske of which are to vast to mention here. Basically businesses use databases anytime a large amount of data must be stored in such a manor that it can easily be searched, categorized and recalled in different means that can be easily read and understood by the end user. Databases are used extensively where I work. In fact, since Hyperion Solutions is a database and financial intelligence software developing company we produce one. To keep the material within scope I shall narrow the use of databases down to what we use just in the Orlando office of Hyperion Solutions alone.
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In database system, main data structure used in relational tables with well define values for each row and column.