2. Definition Data base management system is a system in which “related data”is stored in an “efficient” and “compact” manner. “Efficient”=data which is stored in the DBMS is accessed in very quick time “compact”=means that the data which is stored in DBMS covers very little space in the computer‘s memory “related data“=the data which is stored in the DBMS is about some particular topic.
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4. The DBMS accepts requests for data from an application program and instructs the operating system to transfer the appropriate data.
5. In large systems, a DBMS allows users and other software to store and retrieve data in a structured way.
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8. 1980 – Relational model became popular and accepted as the main database paradigm. SQL, ANSI SQL, etc.
17. Multimedia Databases Contents of MMDB Media data - actual data representing images, audio, video that are captured, digitized, processed, compressed and stored. Media format data - Contains information pertaining to the format of the media data after it goes through the acquisition, processing, and encoding phases. E.g. sampling rate, resolution, frame rate, encoding scheme etc.
18. Multimedia Databases Contents of MMDB 3. Media keyword data (content descriptive data ) Contains keyword descriptions, relating to the generation of the media data. E.g., for a video, includes the date, time, place of recording , person who recorded, scene that is recorded etc.
19. Multimedia Databases Contents of MMDB Media feature data(content dependent data) - Contains the features derived from the media data. A feature characterizes the media contents. E.g., info about the distribution of colors, the kinds of textures and the different shapes present in an image.
20. Multimedia Databases Querying parameters The media keyword data and media feature data are used as indices for searching purpose. The media format data is used to present the retrieved information.
35. Distributed Databases A distributed database is a collection of multiple, logically interrelated databases of the same system distributed over various sites of a computer network. Sometimes "distributed database system" is used to refer jointly to the distributed database and the distributed DBMS.
