187x Filetype PPTX File size 0.35 MB Source: arwan.lecture.ub.ac.id
Data vs Information • Data: Collection of letters, numbers or facts • Information: Processed data that provides value What is Database ? • A database is a repository of data, designed to support efficient data storage, retrieval and maintenance • A database may be specialized to store binary files, documents, images, videos, relational data, multidimensional data, transactional data, analytic data, or geographic data to name a few • Data : stored in various forms, namely tabular, hierarchical and graphical forms What is a database management system ? • Database Management System (DBMS), • Software system that manages databases • the terms “Database”, “DBMS”, “data server”, “database server” often used interchangeably to refer to a DBMS • Why do we need database software or a DBMS? • Security • Can handle many users with good performance • Allows for concurrency while keeping data consistent • Protects from disaster The evolution of database management systems • In the 1960s, network and hierarchical systems such as CODASYL and IMSTM • A revolutionary paper by E.F. Codd, an IBM San Jose Research Laboratory employee in 1970 The paper titled “A relational model of data for large shared data banks” • The Structured Query Language (SQL) invented by IBM in the early 1970's has been constantly improved through the years • Today many businesses need to exchange information, and the eXtensible Markup Language (XML) is the underlying technology that is used for this purpose The evolution of database management systems , Cont’d…
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