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DISTRIBUTED DATABASE MANAGEMENT SYSTEM

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12 diapositives · 900 Views · Jul 11, 2014

DISTRIBUTED DATABASE MANAGEMENT SYSTEM. CHAPTER 07. CONTENTS. The Evolution of Distributed Database Management Systems DDBMS advantages and disadvantages Characteristics of DDBMS DDBMS components. The Evolution of Distributed Database Management Systems.

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  1. DISTRIBUTED DATABASE MANAGEMENT SYSTEM CHAPTER 07

  2. CONTENTS • The Evolution of Distributed Database Management Systems • DDBMS advantages and disadvantages • Characteristics of DDBMS • DDBMS components

  3. The Evolution of Distributed Database Management Systems • Distributed database management system (DDBMS) • Governs storage and processing of logically related data over interconnected computer systems in which both data and processing functions are distributed among several sites Database Systems: Design, Implementation, & Management, 6th Edition, Rob & Coronel

  4. The Evolution of Distributed Database Management Systems (continued) • Centralized database required that corporate data be stored in a single central site • Dynamic business environment and centralized database’s shortcomings spawned a demand for applications based on data access from different sources at multiple locations Database Systems: Design, Implementation, & Management, 6th Edition, Rob & Coronel

  5. Centralized Database Management System Database Systems: Design, Implementation, & Management, 6th Edition, Rob & Coronel

  6. DDBMS Advantages • Data are located near “greatest demand” site • Faster data access • Faster data processing • Growth facilitation • Improved communications • Reduced operating costs • User-friendly interface • Less danger of a single-point failure • Processor independence Database Systems: Design, Implementation, & Management, 6th Edition, Rob & Coronel

  7. DDBMS Disadvantages • Complexity of management and control • Security • Lack of standards • Increased storage requirements • Greater difficulty in managing the data environment • Increased training cost Database Systems: Design, Implementation, & Management, 6th Edition, Rob & Coronel

  8. Characteristics of Distributed Management Systems • Application interface • Validation • Transformation • Query optimization • Mapping • I/O interface • Formatting • Security • Backup and recovery • DB administration • Concurrency control • Transaction management Database Systems: Design, Implementation, & Management, 6th Edition, Rob & Coronel

  9. Characteristics of Distributed Management Systems (continued) • Must perform all the functions of a centralized DBMS • Must handle all necessary functions imposed by the distribution of data and processing • Must perform these additional functions transparently to the end user Database Systems: Design, Implementation, & Management, 6th Edition, Rob & Coronel

  10. A Fully Distributed Database Management System Database Systems: Design, Implementation, & Management, 6th Edition, Rob & Coronel

  11. DDBMS Components • Must include (at least) the following components: • Computer workstations • Network hardware and software • Communications media • Transaction processor (or, application processor, or transaction manager) • Software component found in each computer that requests data • Data processor or data manager • Software component residing on each computer that stores and retrieves data located at the site • May be a centralized DBMS Database Systems: Design, Implementation, & Management, 6th Edition, Rob & Coronel

  12. Distributed Database System Components Database Systems: Design, Implementation, & Management, 6th Edition, Rob & Coronel