MemSQL is an in-memory relational database that uses a unique architecture to achieve high performance and low latency. Its architecture combines the benefits of several technologies, including MVCC (Multi-Version Concurrency Control), lock-free coding, and code generation. MemSQL's use of an in-memory storage system allows it to eliminate the need for disk I/O, reducing latency and improving overall performance. The database also uses a proprietary algorithm to manage concurrency, which enables it to scale horizontally without sacrificing performance. Additionally, MemSQL's code generation capabilities allow developers to quickly build and deploy applications on top of the database, making it an attractive option for businesses looking to improve their development velocity.