Nosql Essay

8417 words - 34 pages

VEDA VYASA INSTITUTE OF TECHNOLOGY NoSQLCHAPTER-1INTRODUCTIONThe history of the relational database has been one of continual difficulty: initially, many claimed that mathematical set-based models could never be the basis for efficient database implementations; later, aspiring object oriented databases claimed they would remove the middle man of relational databases from the OO design and persistence process.Most recently, a new difficulty has arisen to challenge the supremacy of relational databases. Referred to generally as "non-relational databases" (among other names), this class of storage engine finds to break down the rigidity of the relational model, in exchange for leaner models that can perform and scale at higher levels, using various models (including key/value pairs, document-oriented approaches) which can be created and read efficiently as the basic unit of data storage. Primarily, these new technologies have arisen in situations where traditional relational database systems would be extremely challenging to scale to the degree needed for global systems (for example, at companies such as Google, Yahoo, Amazon, LinkedIn, etc., which regularly collect, store and analyze massive data sets with extremely high transactional throughput and low latency).[11]1.1 HistoryCarlo Strozzi used the term NoSQL in 1998 to name his lightweight, open-source relational database that did not expose the standard SQL interface. Eric Evans, reintroduced the term NoSQL in early 2009 to organize an event to discuss open-source distributed databases. The name attempted to label the emergence of a growing number of non-relational, distributed data stores that often did not attempt to provide ACID (atomicity, consistency, isolation, durability) guarantees, which are the key attributes of classic relational database systems such as IBM DB2, MySQL, MicrosoftSQL Server, PostgreSQL, Oracle RDBMS, Informix, Oracle Rdb, etc.[12]1.2 DefinitionIn computing, NoSQL (sometimes expanded to "not only SQL") is a broad class of database management systems that differ from the classic model of the relational database management system(RDBMS) in some significant ways. These data stores may not require fixed table schemas, usually avoid join operations, and typically scale horizontally. [12]The NoSQL archive defines NoSQL databases as "non-relational, distributed, open-source and horizontal scalable".[1]Non-relational means that the database is not based on a relational database model anymore and thus has no relations (tables) - the principle is completely different.Distributed means that the data is stored on and managed by different machines, so there could be data replication.Open source means that everyone can look into the source code for free, change it and compile it themselves. However, this term should not be taken too seriously. It is just meant as an opposite of commercial RDBMSs.Horizontally scalable means that the more database servers you add, the more performance...

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