The text discusses SingleStore, a distributed database system that allows for high concurrency and scalability. It explains how SingleStore spreads work across a cluster of servers without sacrificing ease of use, using two types of machines: aggregators and leaves. Aggregators act as SQL proxies, coordinating parallel operations and combining results, while leaves store data independently, unaware of the larger cluster. The text also covers various configurations for building a SingleStore cluster, including RAID-like setups with multiple donkeys (servers) and more complex configurations with backup donkeys. It highlights the importance of scaling horizontally over commodity computers, rather than relying on single-box databases, and notes that SingleStore aims to provide a highly-concurrent, distributed SQL database with straightforward programming. The text also touches on details such as table types (reference tables and distributed tables) and aggregator roles (master and children).