As mentioned elsewhere, scaling, both vertically (same machine) and horizontally (across multiple machines), is inherent in Apama query applications. Scaled deployments on multiple machines use distributed cache technology to maintain and share application state. Consequently, deployment of Apama query applications includes setting up a distributed cache (the so-called distributed MemoryStore) as well as some kind of messaging. The topics in this section provide instructions for doing this with the recommended platforms.