Distributed_Systems - Distributed Systems P.Mirunalini...

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Unformatted text preview: Distributed Systems P.Mirunalini A.P,CSE SSNCE OVERVIEW s Distributed Systems s Homogeneous / Heterogeneous s Distributed Data Storage r Data Replication r Data Fragmentation s Horizontal Fragmentation s Vertical Fragmentation s Transparency Centralized Database s In a centralized database S Data are stored in one location (e.g. a single hard disk). S A centralized database management system to handle transaction S To handle multiple requests, a client-server system is used r Client send requests for data to server r Server handle query, transaction management etc. Centralized Database Introduction (Distrubted Systems) s In distributed database system, the database is stored on several computers. s The systems can communicate with various communication media like high-speed networks ,telephone lines etc. s They don’t share main memory or disks. s Computers in the distributed systems may vary in size and function ranging from workstations up to main frame systems. s Database systems that run on each site are independent of each other. s Transactions may access data at one or more sites. Introduction (Distrubted Systems) What is a Distributed Database System? s A distributed database (DDB) is a collection of multiple, logically interrelated databases distributed over a computer network. s A distributed database management system (D–DBMS) is the software that manages the DDB and provides an access mechanism that makes this distribution transparent to the users. Transactions s Local Transactions: Access data only from sites where the transaction initiated. s Global Transactions: Accesses data from several different sites Distributed DBMS Distributed DBMS – An Example Implicit Assumptions s Data stored at a number of sites each site logically consists of a single processor....
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This note was uploaded on 04/01/2012 for the course CSE,IT 101 taught by Professor Mirunaalini during the Spring '12 term at Indian Institute of Technology, Chennai.

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Distributed_Systems - Distributed Systems P.Mirunalini...

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