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Chapter 25: Problem 9

Discuss what is meant by the following terms: degree of homogeneity of a DDBMS, degree of local autonomy of a DDBMS, federated DBMS, distribution transparency, fragmentation transparency, replication transparency, multidatabase system.

Short Answer

Expert verified
These terms are all key concepts in relation to distributed database systems, dealing with aspects such as the homogeneity and autonomy of the system, transparency of distribution, fragmentation and replication, and the framework of federated and multidatabase systems.

Step by step solution

01

Discuss degree of homogeneity of a DDBMS

The degree of homogeneity of a Distributed Database Management System (DDBMS) refers to the extent to which the databases follow the same rules and structures. In a fully homogeneous DDBMS, all databases have the same underlying system, use the same methods of operation, and look the same to the user.
02

Discuss degree of local autonomy of a DDBMS

The degree of local autonomy in a DDBMS dictates how much control a local database has over its data. An ideal DDBMS would provide a high degree of local autonomy, allowing local databases to control their operations and performance, without affecting the global system.
03

Discuss federated DBMS

A Federated Database Management System (DBMS) is a type of DDBMS where multiple databases are allied together, forming a federated system. Each of these databases maintains their own autonomy, data integrity, and security measures. The federated DBMS presents an integrated front to the users.
04

Discuss Distribution Transparency

Distribution transparency in a DDBMS ensures that the physical storage details of the data are hidden from the users. Users access data in the same way as if it were stored locally, even if it's distributed across multiple locations.
05

Discuss Fragmentation Transparency

Fragmentation transparency in a DDBMS allows data to be divided into various pieces or fragments and stored across different sites, whilst appearing to the user as a single unbroken system. This aids in improving performance, reliability and availability.
06

Discuss Replication Transparency

Replication transparency refers to the fact that data can be replicated or copied and stored on multiple sites to ensure availability and fast access. However, the user of the DDBMS is not aware of the underlying replication.
07

Discuss Multidatabase System

A multidatabase system is a system that can handle multiple databases, where each database runs under a different DBMS. The multidatabase system provides an overarching structure to connect these individual databases, although they maintain a degree of autonomy.

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