Ddb 1.6-design issues
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The document summarizes the key design issues that must be addressed when building a distributed database management system (DBMS). It outlines nine main design issues: 1) distributed database design, 2) distributed directory management, 3) distributed query processing, 4) distributed concurrency control, 5) distributed deadlock management, 6) reliability of distributed DBMS, 7) replication, 8) relationships among problems, and 9) additional issues like federated databases and peer-to-peer computing raised by growth of the internet. For each issue, it briefly describes the challenges and considerations for designing a distributed DBMS.
Ddb 1.6-design issues
- 1. Distributed Data base System by M. Tamer Özsu • Patrick Valduriez Chp-1 1.6- Third Edition Design Issues Slides by: M. Esar ul Haq Qasmi std@ UIIT-Pak Note: All Details are available in defined Book. Here in slides just Summary is written for an overlook and preparations.
- 2. Design Issues • presenting the design issues that arise in building a distributed DBMS. I. Distributed Database Design II. Distributed Directory Management III. Distributed Query Processing IV. Distributed Concurrency Control V. Distributed Deadlock Management VI. Reliability of Distributed DBMS
- 3. Design Issues I. Distributed Database Design -How the database and the applications that run against it should be placed across the sites? -There are two basic alternatives to placing data: partitioned (or non-replicated) and replicated. -Replicated designs can be either fully replicated or partially replicated -The two fundamental design issues are fragmentation, the separation of the database into partitions called fragments, and distribution, the optimum distribution of fragments.
- 4. Design Issues II-Distributed Directory Management A directory contains information (such as descriptions and locations) about data items in the database. Problems related to directory management are similar in nature to the database
- 5. Design Issues III-Distributed Query Processing Query processing deals with designing algorithms that analyze queries and convert them into a series of data manipulation operations.
- 6. Design Issues IV-Distributed Concurrency Control Concurrency control involves the synchronization of accesses to the distributed data-base, such that the integrity of the database is maintained.
- 7. Design Issues V-Distributed Deadlock Management • The deadlock problem in DDBSs is similar in nature to that encountered in operating systems. • The competition among users for access to a set of resources (data, in this case) can result in a deadlock if the synchronization mechanism is based on locking. The well-known alternatives of prevention, avoidance, and detection/recovery also apply to DDBSs.
- 8. Design Issues VI-Reliability of Distributed DBMS • to ensure the consistency of the database as well as to detect failures and recover from them. • The implication for DDBSs is that when a failure occurs and various sites become either inoperable or inaccessible, the databases at the operational sites remain consistent and up to date.
- 9. Design Issues VII- Replication • If the distributed database is (partially or fully) replicated, it is necessary to implement protocols that ensure the consistency of the replicas, i.e., copies of the same data item have the same value.
- 10. Design Issues VIII-Relationship among Problems • The relationship among the components • The design of distributed databases affects many areas…. • directory management, fragment structure and placement, processing of queries, replication of fragments, transaction management, Reliability, replication etc
- 11. Design Issues • IX-Additional Issues • federated databases and data integration systems The growth of the Internet as a fundamental networking platform has raised important questions about the assumptions underlying distributed database systems. Two issues are of particular concern to us. • One is the re-emergence of peer-to-peer • computing, and the other is the development and growth of the World Wide Web (web for short)
- 12. Design Issues •
- 13. Design Issues Design issues Topic Finished Note: All Details are available in defined Book. Here in slides just Summary is written for an overlook and preparations.