Rust is great for building databases because it ensures memory safety, avoids garbage collection, and prevents memory leaks and data races. Databend is a prime example—it's one of the largest database projects written in Rust, with over 476,000 lines of code developed from scratch over the past three years. While Rust isn't as widely adopted as some other languages, its use in projects like Databend demonstrates its potential for creating high-performance, reliable systems.