The security of the database system depends not only on the security of the database itself, but also on the security of the network environment and the operating system. The mimicry defense is proposed firstly by Academician WU Jiang-Xing based on the dynamic heterogeneous redundancy architecture, and the database is dependent on the environment. Security has changed from passive defense to active defense. This study uses Mycat as a database middleware, through the separated read and write of the database, the cluster's high availability, distributed transaction processing, fingerprinting SQL identification, to alleviate the data access and processing pressure of a single database. Mycat turns the database module into a heterogeneous dynamic redundancy mode, which enables database mimicking, enabling efficient, fast, and secure access and segmentation of data.