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. In a consistent system the view of the data is atomic at the all time. Under network partitioning a database can either provide consistency (CP) or availability (AP). ... MongoDB, Redis, AppFabric Caching, and MemcacheDB. You’ll often hear about the CAP theorem which specifies some kind of an upper limit when designing distributed systems. Consistency – All your data servers have the same data, so you can query any server in the system and get the exact same data. Financial System : Consistent & Available Chat Applications : Consistent & Partition tolerant Cache : Redis – Consistent & partition tolerant The DNS, MongoDB, Redis are the example of CP systems. 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). An AP system delivers availability and partition tolerance at the expense of consistency. CAP – Consistency, Availability, Partition Tolerance. CAP Theorem for data stores has been studied pretty well. The CAP Theorem You cannot build a general data store that is continually available, sequentially consistent and tolerant to any partition failures. Consistency: All nodes can see the same data at the same time. How is CAP theorem used in the field of distributed system databases? 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. ... Redis, PostgreSQL, Neo4J(they don’t distribute data) consistent and partition tolerant (CP): MongoDB and HBase. CAP theorem: CAP theorem is just the observation we made above. This proves CAP theorem. AP – Possibility of Non-Consistent. Distributed Systems - The CAP Theorem. A distributed system is any network structure that consists of autonomous systems that are connected using a distribution node. Note that a DB running on a single node under a some number of requests and duration execution time will … 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. Defining CAP Terminology. This perfectly fits well for data store technologies. AP in CAP Theorem. cap theorem states that any database system can only attain two out of following states which is consistency, availability and partition tolerance. The CAP Theorem Published by Eric Brewer in 2000, the theorem is a set of basic requirements that describe any distributed system. 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. You can only achieve 2 feature out of 3. Before we deep dive into the concepts, let us try to understand the distribution system. True consistency is given up in favor of performance. The essential idea being, out of Consistency, Availability and Partition-Tolerance, a data store technology can choose either of two at any point in time. As such, it was designed from the ground up with the major value additions to Redis in mind: performance and a strong data model. Because of this, Redis Cluster implements neither true availability nor consistency of the CAP theorem. CAP Theorem Consistency. Use Cases. ... HBase, Redis, MongoDB etc., AP System. Example Cassandra chose A & P while Redis chose C & P, SQL Server went with C & A. 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