Database management systems

Topics: Entity-relationship model, Database management system, Data modeling Pages: 2 (512 words) Published: August 2, 2014

1. Question(s)
a) Find definitions using your text or other appropriate source for the following and write them in your own words. Take a note of the source that you have used to find the information. Data
Data is any information that is in raw format like number, characters, symbols etc.

Information in raw or unorganized form (such as alphabets, numbers, or symbols) that refer to, or represent, conditions, ideas, or objects. Data is limitless and present everywhere in the universe. Information

When data is combined with useful meaning or representation it is information. Information is processed data that is used to make informed decisions.

Information systems
Anything that provides information or part of system or equipment that delivers information is known as information system. An information system refers to a collection of multiple pieces of equipment involved in the dissemination of information. Hardware, software, computer system connections and information, information system users, and the system’s housing are all part of an IS.

Data processing
Data processing is performing operations on given set of data and converting it into usable form.

Operations performed on a given set of data to extract the required information in an appropriate form such as diagrams, reports, or tables.

Entity relationship diagram
Entity relationship diagram models the real world situations as a collection of entities and relationship amongst the entities.

b) What is the data hierarchy? Briefly explain this in your own words. Data hierarchy is representation of data in pyramid format with smallest form of data on th top of pyramid and biggest form at the bottom of it. Smallest form of data bit and after that characters. Collection of fields forms a records and multiple records forms a file. And multiple files together forms a database which is at bottom of hierarchy as it is bigger form of data.

c) Briefly describe...
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