The following experiment primarily uses ApsaraDB for Redis.Redis is an open-source and memory-based key-value storage system with high performance. It is similar to Memcached, but supports more data types, including string, list, set, and hash table. Redis also supports data persistence.This experiment introduces a method to analyze the memory usage of data in a Redis instance without affecting its online use. With the assistance of redis -rdb-tools and SQLite, the method performs static analysis by using the RDB files generated from Redis persistence commands. The method is easy, practical, and useful for every Redis user.