seminar topics on distributed database management system ppt
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when we type in marathi how it is saved in database

when we type in other language then how it is stored in database
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when we typed in marathi how it stored in database
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#3
Introduction to Seminar Topic on Distributed Database Management System:
Distributed database has become wide spread due to the growing requirement in the data base management systems. In order to increase the response times of the systems the distributed database is employed. Distributed database is the best method for handling the data in the network and it reduces the load on the single server. A central control will be present to organize the distributed data. In this paper we will see how the data gets distributed over the network and how they are used when they are required.

Brief into the distributed database:

In the distributed database the entire data will not be connected to a single cpu they get distributed over the entire network. The operations occurring on the network gets distributed when the application tasks run. This design uses a distributed processing architecture for running the front end and back end tasks.

By the distribution database the user will be transparent and cannot know the physical location of the data. The central page link between the user and the distributed data is a database link, which allows the user to access the logical database.

Advantages and disadvantages:

Distributed database increases the reliability and the availability of the databases. As the data gets distributed in the network the response time gets improved. By employing the distribution database we can perform continuous processing of the data. It does make the make the users to rely on the central site for the databases. As the data gets distributed over the network it becomes complex to provide security to the distributed data.
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#4
A distributed database is a database in which storage devices are not all attached to a common processing unit such as the CPU, and which is controlled by a distributed database management system[clarification needed] (together sometimes called a distributed database system). It may be stored in multiple computers, located in the same physical location; or may be dispersed over a network of interconnected computers. Unlike parallel systems, in which the processors are tightly coupled and constitute a single database system, a distributed database system consists of loosely coupled sites that share no physical components.

System administrators can distribute collections of data (e.g. in a database) across multiple physical locations. A distributed database can reside on organized network servers or decentralized independent computers on the Internet, on corporate intranets or extranets, or on other organization networks. Because they store data across multiple computers, distributed databases may improve performance at end-user worksites by allowing transactions to be processed on many machines, instead of being limited to one.
Two processes ensure that the distributed databases remain up-to-date and current: replication and duplication.

Replication involves using specialized software that looks for changes in the distributive database. Once the changes have been identified, the replication process makes all the databases look the same. The replication process can be complex and time-consuming depending on the size and number of the distributed databases. This process can also require a lot of time and computer resources.
Duplication, on the other hand, has less complexity. It basically identifies one database as a master and then duplicates that database. The duplication process is normally done at a set time after hours. This is to ensure that each distributed location has the same data. In the duplication process, users may change only the master database. This ensures that local data will not be overwritten.
Both replication and duplication can keep the data current in all distributive locations.[2]

Besides distributed database replication and fragmentation, there are many other distributed database design technologies. For example, local autonomy, synchronous and asynchronous distributed database technologies. These technologies' implementations can and do depend on the needs of the business and the sensitivity/confidentiality of the data stored in the database, and the price the business is willing to spend on ensuring data security, consistency and integrity.

When discussing access to distributed databases, Microsoft favors the term distributed query, which it defines in protocol-specific manner as "[a]ny SELECT, INSERT, UPDATE, or DELETE statement that references tables and rowsets from one or more external OLE DB data sources". Oracle provides a more language-centric view in which distributed queries and distributed transactions form part of distributed SQL.
Today the distributed DBMS market is evolving dramatically, with new, innovative entrants and incumbents supporting the growing use of unstructured data and NoSQL DBMS engines, as well as XML databases and NewSQL databases. These databases are increasingly supporting distributed database architecture that provides high availability and fault tolerance through replication and scale out ability. Some examples are Aerospike, Cassandra, Clusterpoint, ClustrixDB, Couchbase, Druid (open-source data store), FoundationDB, NuoDB, Riak and OrientDB. The blockchain technology popularised by bitcoin is an implementation of a distributed database.
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