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Eventual consistency is a weak guarantee – most stronger models, like linearizability, are trivially eventually consistent. Eventually-consistent services are often classified as providing BASE semantics (basically-available, soft-state, eventual consistency), in contrast to traditional ACID (atomicity, consistency, isolation, durability) .
In slow consistency, [14] if a process reads a value previously written to a memory location, it cannot subsequently read any earlier value from that location. Writes performed by a process are immediately visible to that process. Slow consistency is a weaker model than PRAM and cache consistency.
I cannot imagine how ACID and BASE can possibly be considered mutually exclusive. ACID is about write operations on an individual server, BASE is about replication between at least 2 servers. You can achieve eventual consistency on a replication environment with a fully ACID-compliant DBMS. This is the most common situation.
A consistency proof is a mathematical proof that a particular theory is consistent. [8] The early development of mathematical proof theory was driven by the desire to provide finitary consistency proofs for all of mathematics as part of Hilbert's program .
Guaranteed eventual entry to a critical section whenever entry is attempted; Fair access to a resource in the presence of contention. The good thing in the first example is discrete but not in the others. Producing an answer within a specified real-time bound is a safety property rather than a liveness property.
Strong versus eventual consistency (storage) [ edit ] In the context of scale-out data storage , scalability is defined as the maximum storage cluster size which guarantees full data consistency, meaning there is only ever one valid version of stored data in the whole cluster, independently from the number of redundant physical data copies.
Optimistic replication, also known as lazy replication, [1] [2] is a strategy for replication, in which replicas are allowed to diverge. [3]Traditional pessimistic replication systems try to guarantee from the beginning that all of the replicas are identical to each other, as if there was only a single copy of the data all along.
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