Data independence in dbms with example pdf form
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This data is processed as it is being delivered. An optimal viewing or listening experience requires DBMS to deliver the data at a certain rate which offers the quality of service, which is above a particular threshold. Presentation applications: These involve the delivery of multimedia data subject to the temporal constraint.Repository applications: An extensive amount of multimedia data stored along with metadata for retrieval purposes.The types of multimedia applications that are based on the data management characteristics are: Media feature data: Media feature data contains data which is content dependent such as kind of texture, distribution of, and the different shapes present in the data.Examples of content descriptive data are place, time, date of recording. This data is also known as content descriptive data. Media keyword data: Media keyword data are the keyword description related to the generation of data.about the format of the media data under consideration after is undergoes acquisition, processing, and encoding is the media format data. Media format data: The information such as resolution, sampling rate, encoding system, etc.Media data: It is the actual data which represents an object.The contents of a multimedia database management system can be: The Logical data independence is difficult to achieve than physical data independence as it requires the flexibility in the design of database and prograll1iller has to foresee the future requirements or modifications in the design.The multimedia database can be classified into three types. Making the conceptual schema physically data independent means that the external schema, which is defined on the conceptual schema, is in turn physically data independent. The physical data independence criterion requires that the conceptual level does not specify storage structures or the access methods (indexing, hashing etc.) used to retrieve the data from the physical storage medium. This change is necessary to maintain the conceptual level invariant. If there is a need to change the file organization or the type of physical device used as a result of growth in the database or new technology, a change is required in the conceptual/ internal mapping between the conceptual and internal levels. Conceptual level to internal level mapping, therefore provides a means to go from the conceptual view (conceptual records) to the internal view and hence to the stored data in the database (physical records). Physic 1data independence is achieved by the presence of the internal level of the database and the n, lP ping or transformation from the conceptual level of the database to the internal level. The change would be absorbed by the mapping between the conceptual and internal levels. Physical data independence indicates that the physical storage structures or devices could be changed without affecting conceptual schema. change in the external/conceptual mapping so as to leave the external view unchanged.
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Logical data independence also insulates application programs from operations such as combining two records into one or splitting an existing record into two or more records. The change would be absorbed by the mapping between the external and conceptual levels. Logical data independence indicates that the conceptual schema can be changed without affecting the existing external schemas.
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