Through the DRDS database middleware, the complexity of the underlying database is hidden, and a unified interface is provided for application developers to operate the database. Application developers do not need to understand the existence of middleware but only need to understand the concept of databases. They can create and manage logical tables through logical databases, and use standard SQL statements to add, delete, modify and retrieve tables, just like in a traditional single database. Middleware converts these operations into those of the underlying physical database while handling sharding rules, data distribution and replication. In addition, functions such as high availability and performance optimization are also provided.
