Distributed DBMS

RGPV: Distributed System: Unit 5


Distributed Database Management System (DDBMS) is a type of DBMS which manages a number of databases hoisted at diversified locations and interconnected through a computer network.

 It provides mechanisms so that the distribution remains oblivious to the users, who perceive the database as a single database.

Features of distributed database management system:

·        It is used to create, retrieve, update and delete distributed databases.

·         It synchronizes the database periodically and provides access mechanisms by the virtue of which the distribution becomes transparent to the users.

·         It ensures that the data modified at any site is universally updated.

Factors Encouraging DDBMS: The following factors encourage moving over to DDBMS-

·         Distributed Nature of Organizational Units – Most organizations in the current times are subdivided into multiple units that are physically distributed over the globe. Each unit requires its own set of local data.


·         Need for Sharing of Data − The multiple organizational units often need to communicate with each other and share their data and resources.



·         Support for Both OLTP and OLAP − Online Transaction Processing (OLTP) and Online Analytical Processing (OLAP) work upon diversified systems which may have common data. Distributed database systems aid both these processing by providing synchronized data.


·         Database Recovery − One of the common techniques used in DDBMS is replication of data across different sites. Replication of data automatically helps in data recovery if database in any site is damaged.


·         Management of distributed data with different levels of transparency like network transparency, fragmentation transparency, replication transparency, etc.

·         Increase reliability and availability

·         Easier expansion

·         Reflects organizational structure

·         Protection of valuable data.


·         Complexity

·         Economics — increased complexity and a more extensive infrastructure means extra labour costs

·         Security

·         Concurrency control poses a major issue. It can be solved by locking and timestamping.







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