Data Modeling Concepts COM 660 Data Modeling Concepts Following document explains what are data models and the importance of data model. Building a good data model helps organizations in software development, data base design and product maintenance. The document explains the theory, even if it looks like the organizations are spending substantial amount of resources on developing data models, but still it helps organization, keeping the costs low and build a better product. Database constitutes of data structures and is represented by conceptual data structures. Data models are abstract models which is required to define how data can be consumed and put to effective use. The main reason why construction of data model is required …show more content…
Data item includes all elements that exist to define components of configuration items. Examples include employee details, course details or student grade details. Data Items have a number of attributes, and is related to a single configuration item. Relationship Items defines relationship between two configuration items, or two data items or between a configuration item and data item. Examples include employee relationship with courses schedule, courses schedule relationship with students and students’ relationship with grades. Relationship can be one-to-one, one-to-many or in many-to-many form, depending upon how the business functions are setup. Why is Data Modeling Important? Data modeling is the most critical aspect development process. Developing data model is very expensive in terms of labor, time and future business process. Even if there is time crunch or pressure to deliver the project, still data modeling should be done, before any other database development activity happens. Databases should not be built without data model. Same as it is not viable to build a house without blueprints. Projects can go terribly wrong if the process is not being followed and would cost in terms of money time and loss in profit. The primary goal of the data model is to ensure that the all data objects required by the database are analyzed and planned to represent it
Data objects can model relational data or advanced data types such as graphics, movies, and audio. Smalltalk, C++, Java, and others are objects used in object-oriented data. The object-relational is a combination of relational and object-oriented databases. Traditional and advanced data types can be used to construct database management systems. These systems can connect to a company’s website and update records as needed. Database Approach The main purpose of a database is data storage that can be stored and retrieved when needed. A popular common language called structured query language (SQL) is used to store and retrieve data in relational database. This language enables the systems to run a report or modify data or remove the data from the database. A database management system (DBMS) controls all aspects of a database, this is not limited to the creation, maintenance, and use of database. The DBMS ensures proper applications are able to access the database. An important purpose of a DBMS is to maintain the data definitions (data dictionary) for all the data elements in the database. It also enforces data integrity and security measures. Data Models Data models provide a contextual framework and graphical representation that aid in the definition of data elements. In a relational database, the data model lays the foundation for the database and identifies important entities,
It is a process of constructing a data model for each view of the real world problem which is independent of physical considerations. This stage involves assessing the informational needs of an organization so that a database can be designed to meet those needs.
Employee data (names and phone numbers), project data (project name), and job data (charge per hour and project hours).
Data is defined as useful raw material which is intended to be useful for both the originator and for the intended receiver. Data consists largely of facts and figures ideal for communicating the intended meaning. This data can be interpreted and can be categorised as follows;
The data structure represents the logical relationships between data elements. In addition the data also determines the organizational structure, access methods, and alternative processing assosiativitas level for information.
Database model defines the logical structure of the database by determining manner in which the data will be stored. Relational model is one of the most popular database models, which defines tables and relationships between the tables.
Prior to designing my database, I will have a clear understanding of the data. This will allow me to determine the purpose of the database. Once all information is
The conceptual model will have all of the attributes from the students as well as the instructors. It will also have the all of the constraints. This model will have software and hardware independency. At this level any changes to the database management system will not affect this model. The physical model will take all the information that comes from the conceptual model and describe it so that it can be saved and stored. This model will need to know the physical storage device and access method so that it can reach the information stored in the devices. The physical model, not like the conceptual, will be both software and hardware
This model demonstrates the data attributes logical entities and relationships between these entities within a business function. It also helps to create the physical data model. Moreover, it shows more details while integrate business logic and business rules. This model is used to describe the domain concept and their relationship of the domain problem.
There are several important steps to consider when designing a database, as a well-designed database should be deployed and not only support the accuracy and integrity of business information but also avoid redundant data and assist with has enterprise level reporting tasked. If we analyze the
Course Description This course covers database concepts. Topics include data analysis, the principal data models with emphasis on the relational model, entity-relationship diagrams, database design, normalization, and database administration. Policies Faculty and students will be held responsible for understanding and adhering to all policies contained within the following two documents: • • University policies: You must be logged into the student website to view this document. Instructor policies: This
Logical and physical models represent the key elements and processes of the software development. The logical model describes the processes, and data, in as much detail as possible, without giving regard to how the system will be implemented. Logical data models include
A database is part of a larger system known as an information system, it helps with the collection, storage and retrieval of data. The database structure needs to be defined and its fields labeled properly for it to be an asset to the user.
Database system design can be extremely time-consuming as it takes sophisticated software to create and control it. The design process becomes less user-friendly as it takes a more extensive knowledge of how to use it. The standard of an excellent database is one, which is complete, integral, simple, understandable, flexible and
Databases are the center of many technology and non-technology focused businesses. They are used in retail, healthcare, education and government. Databases are essentially in entering, storing, managing and referencing data, and can be simple in nature, or extremely complex. In order for a database to be implemented correctly, planning is required. Planning takes place from the moment of idea inception, and continues throughout multiple stages of the planning process (typically during the analysis and design phases). An Entity-relationship diagram, or ERD, is a visual layout or plan for a database. An ERD is defined as “a graphical model that shows the logical model of the data for an organization (Dischiave, n.d.).” ERDs should follow the industry standard best practices in order to be most effective and useful overall. ERDs that do not follow certain best practices, which are outlined in this paper, could cause delays, inconsistencies, or lasting problems when designing and implementing a database. ERDs should follow set business rules, follow appropriate, effective and consistent naming conventions, should clearly outline unary, binary and ternary relationships, should include attributes, entities and relationships and should be clear and easy to follow (Hoffer, 2012). The article entitled