A logically reticulated collection of shared information (and an outline of this data), physically distributed over a network.
A logically reticulated collection of shared information (and an outline of this data), physically distributed over a network.
Read more at http://smallseotools.com/article-rewriter/#XTJdjtUQ9LrUrlbo.99
Read more at http://smallseotools.com/article-rewriter/#XTJdjtUQ9LrUrlbo.99
A logically reticulated collection of shared information (and an outline of this data), physically distributed over a network.
Read more at http://smallseotools.com/article-rewriter/#XTJdjtUQ9LrUrlbo.99
Read more at http://smallseotools.com/article-rewriter/#XTJdjtUQ9LrUrlbo.99
Distributed software system
Software system that allows the management of the distributed information and makes the distribution clear to users.
Distributed information system (DDBS) = DDB + DDBMS
Distributed database features:
• information hold on at variety of web sites, every web site logically single processor
• Sites square measure interconnected by a network instead of a digital computer configuration
• DDB is logically one information (although every web site may be a information site)
• DDBMS has full practicality of a software system
• To the user, the distributed information system ought to seem specifically sort of a non-distributed information system.
Distributed database advantages:
• Reduced Communication Overhead : Most information access is native, less costly and performs higher.
• Improved process Power : rather than one server handling the complete information, we tend to currently have a group of machines handling a similar information.
• Removal of Reliance on a Central web site
• Expandability
• native autonomy
The information is brought nearer to its users. this will impact a cultural modification because it permits doubtless bigger management over native information.
Distributed database disadvantages:
• complexness (greater potential for bugs in software)
• price (software development may be far more complicated and thus pricey. Also, exchange of messages and extra computations involve increased overheads)
• distribution of management (no single information administrator controls the DDB)
• security (since the system is distributed the possibilities of security lapses square measure greater)
• troublesome to alter (since all sites have management of their own sites)
• lack of expertise (enough expertise isn't on the market in developing distributed systems)
DDBMS rules:
- No reliance on a central web site
- Continuous operation
- Location independence
- Fragmentation independence
- Replication independence
- Distributed question independence
- Distributed dealings process
- Hardware independence
- OS independence
- Network independence
- information independence
Distributed database Issues:
- information Fragmentation
- information Allocation
- information Replication
- Distributed Catalogue Management
- Distributed Transactions
- Distributed Queries optimisation
- Distributed update propagation
- Distributed concurrency management
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