To manage and access data, it is important to understand how Hyper-Converged Database (HCD) stores data. The hinted handoff feature plus conformance and non-conformance to the ACID (atomicity, consistency, isolation, durability) database properties are key concepts to understand reads and writes. In HCD, consistency refers to how up-to-date and synchronized a row of data is on all of its replicas.

Developing applications for data storage and retrieval are provided for clients via the Data API or drivers which interact with the CQL native protocol. See Connection methods comparison.