... MongoDB, Redis, AppFabric Caching, and MemcacheDB. As such, it was designed from the ground up with the major value additions to Redis in mind: performance and a strong data model. You can only achieve 2 feature out of 3. Consistency – All your data servers have the same data, so you can query any server in the system and get the exact same data. A distributed system is any network structure that consists of autonomous systems that are connected using a distribution node. An AP system delivers availability and partition tolerance at the expense of consistency. AP – Possibility of Non-Consistent. Consistency: All nodes can see the same data at the same time. CAP Theorem Consistency. Financial System : Consistent & Available Chat Applications : Consistent & Partition tolerant Cache : Redis – Consistent & partition tolerant Under network partitioning a database can either provide consistency (CP) or availability (AP). In a consistent system the view of the data is atomic at the all time. Distributed Systems - The CAP Theorem. Let’s get some basic definitions out of the way so we can be on the same page as we move forward talking about this theorem. Example Cassandra chose A & P while Redis chose C & P, SQL Server went with C & A. Use Cases. Because of this, Redis Cluster implements neither true availability nor consistency of the CAP theorem. You’ll often hear about the CAP theorem which specifies some kind of an upper limit when designing distributed systems. CAP – Consistency, Availability, Partition Tolerance. CAP Published by Eric Brewer in 2000, the theorem is a set of basic requirements that describe any distributed system like: NoSQL Cassandra, MongoDB, CouchDB. This proves CAP theorem. At any given point of time, if there are series of operation happened and state of the data is changed, any query being served post the change should have modified data. Simply put, the CAP theorem demonstrates that any distributed system cannot guaranty C, A, and P simultaneously, rather, trade-offs must be made at a point-in-time to achieve the level of performance and availability required for a specific task. Defining CAP Terminology. In the event of a network partition, they can become unable to respond to certain types of queries (for example, in a Mongo replica set you flag slaveok to false for reads). ... Redis, PostgreSQL, Neo4J(they don’t distribute data) consistent and partition tolerant (CP): MongoDB and HBase. AP in CAP Theorem. Before we deep dive into the concepts, let us try to understand the distribution system. The DNS, MongoDB, Redis are the example of CP systems. CAP Theorem for data stores has been studied pretty well. How is CAP theorem used in the field of distributed system databases? The CAP Theorem Published by Eric Brewer in 2000, the theorem is a set of basic requirements that describe any distributed system. 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