12. Cap Tuning Chart NRW Outcome N=3 Magic Number of Data Replicas W=N R=1 Read Optimized – Strong Consistency. W=1 R=N Write Optimized – Strong Consistency. W+R > N Strong Consistency on Read and Write. W+R <= N Weak Eventual Consistency. Read may not see the latest Data. N > W > 1 Eventual Consistency - Most NoSQL data stores live here.
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Notes de l'éditeur
NoSQL does not mean no SQL, or that it is against SQL or RDBMS data bases. NoSQL is better characterized as non-RDBMS data stores, but even that is not completely true.
NoSQL are very compatible and often used together. SQL usually takes the OLTP role while NoSQL slots in for special purposes.
Brewer's Theorem - Inktomi C onsistency A vailability P artition Tolerance You can have any 2 but not all 3 C & A in single node system Add P and you must choose between C and A
Membase is distributed (elastic) map CouchDb is document store Companies combined to form CouchBase
RDF = Resource Description Framework
RDF – Resource Description Framework Triplestore – Subject – Predicate – Object Predicate is relationship OWL – Web Ontology Language – semantic web
![The NoSQL Landscape ,[object Object]](https://image.slidesharecdn.com/nosqllandscapenosqltips-110728001432-phpapp02/85/No-sql-landscape_nosqltips-1-320.jpg)
![About Me ,[object Object],[object Object],[object Object],[object Object],[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)