Data consistency

Tunable Consistency and Consistency Levels

How are consistent read and write operations handled?: An introduction to how DataStax Enterprise extends eventual consistency with tunable consistency to vary the consistency of data read and written.
How do DataStax Enterprise transactions differ from RDBMS transactions?: DataStax Enterprise (DSE) does not use RDBMS ACID transactions; instead DSE offers atomic, isolated, and durable transactions with eventual/tunable consistency.
How do I accomplish lightweight transactions with linearizable consistency?: When and why to use lightweight transactions.
How do I discover consistency level performance?: Use tracing to discover what the consistency level is set to, and how it affects performance.
How is the consistency level configured?: Consistency levels in DataStax Enterprise can be configured to manage availability versus data accuracy.
How is the serial consistency level configured?: Serial consistency levels in DataStax Enterprise control lightweight transaction (LWT) isolation.
How are read requests accomplished?: A coordinator node can send three types of read requests to a replica.
How are write requests accomplished?: The write consistency level determines how many replica nodes must respond with a success acknowledgment in order for the write to be considered successful.