tailieunhanh - FUNDAMENTALS OF DATABASE SYSTEMS Fourth Edition phần 10

Liên kết động có sẵn trong hai ORDBMSs mà chúng tôi nghiên cứu. • Khách hàng-máy chủ các vấn đề đối phó với vị trí và kích hoạt các chức năng. Nếu máy chủ cần phải thực hiện một chức năng, nó là tốt nhất để làm như vậy trong không gian địa chỉ DBMS chứ không phải là từ xa, do số lượng lớn các chi phí. Nếu chức năng nhu cầu tính toán rằng | Multimedia Databases I 929 Marketing advertising retailing entertainment and travel There are virtually no limits to using multimedia information in these applications from effective sales presentations to virtual tours of cities and art galleries. The film industry has already shown the power of special effects in creating animations and synthetically designed animals aliens and special effects. The use of predesigned stored objects in multimedia databases will expand the range of these applications. Real-time control and monitoring Coupled with active database technology see Chapter 24 multimedia presentation of information can be a very effective means for monitoring and controlling complex tasks such as manufacturing operations nuclear power plants patients in intensive care units and transportation systems. Commercial Systems for Multimedia Information Management. There are no DBMSs designed for the sole purpose of multimedia data management and therefore there are none that have the range of functionality required to fully support all of the multimedia information management applications that we discussed above. However several DBMSs today support multimedia data types these include Informix Dynamic Server DB2 Universal database UDB of IBM Oracle 9 and 10 CA- JASMINE Sybase ODB II. All of these DBMSs have support for objects which is essential for modeling a variety of complex multimedia objects. One major problem with these systems is that the blades cartridges and extenders for handling multimedia data are designed in a very ad hoc manner. The functionality is provided without much apparent attention to scalability and performance. There are products available that operate either stand-alone or in conjunction with other vendors systems to allow retrieval of image data by content. They include Virage Excalibur and IBM s QBIC. Operations on multimedia need to be standardized. The MPEG-7 and other standards are addressing some of these issues. .