Different Consistency Models

This section discusses four different types of consistency models.

• Sequential consistency

• Strong consistency

• Causal consistency

• Eventual consistency

Sequential consistency

In the sequential consistency model, if multiple clients are executing concurrent operations, then:

• The result of concurrent operations by multiple clients is the same as executing the concurrent operations in arbitrary sequential orders.

• The concurrent operation by each client is applied in the same sequence specified by the client.

Thus, in a sequential consistency model, there is no global order of concurrent operations between multiple clients. However, there is a well-defined order in executing operations from the same client.