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No sql landscape_nosqltips
- 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.
Hinweis der Redaktion
- 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