NCache vs VoltDB: What are the differences?
NCache: Distributed In-Memory Datastore. It is an extremely fast and scalable distributed cache for .NET. It helps high traffic server applications remove data storage bottlenecks by caching application and linearly scale to handle extreme transaction loads without slowing down; VoltDB: In-memory relational DBMS capable of supporting millions of database operations per second. VoltDB is a fundamental redesign of the RDBMS that provides unparalleled performance and scalability on bare-metal, virtualized and cloud infrastructures. VoltDB is a modern in-memory architecture that supports both SQL + Java with data durability and fault tolerance.
NCache and VoltDB can be categorized as "In-Memory Databases" tools.