Database Management Systems

Topics: Database management system, SQL, Database, Data modeling, Relational model / Pages: 32 (7809 words) / Published: Dec 3rd, 2012
Database management systems

A database management system (DBMS) consists of software that operates databases, providing storage, access, security, backup and other facilities. Database management systems can be categorized according to the database model that they support, such as relational or XML, the type(s) of computer they support, such as a server cluster or a mobile phone, the query language(s) that access the database, such as SQL or XQuery, performance trade-offs, such as maximum scale or maximum speed or others. Some DBMS cover more than one entry in these categories, e.g., supporting multiple query languages. Examples of some commonly used DBMS are MySQL, PostgreSQL, Microsoft Access, SQL Server, FileMaker,Oracle,Sybase, dBASE, Clipper,FoxPro etc. Almost every database software comes with an Open Database Connectivity (ODBC) driver that allows the database to integrate with other databases.
Definition of terms
What is Data?
Data is a collection of facts, such as values or measurements.
It can be numbers, words, measurements, observations or even just descriptions of things.
The term data refers to qualitative or quantitative attributes of a variable or set of variables. Data (plural of "datum") are typically the results of measurements and can be the basis of graphs, images, or observations of a set of variables. Data are often viewed as the lowest level of abstraction from which information and then knowledge are derived. Raw data, i.e. unprocessed data, refers to a collection of numbers, characters, images or other outputs from devices that collect information to convert physical quantities into symbols.
Qualitative vs Quantitative
Data can be qualitative or quantitative. • Qualitative data is descriptive information (it describes something) • Quantitative data, is numerical information (numbers).
And Quantitative data can also be Discrete or Continuous: • Discrete data can only take certain values (like whole numbers)

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