Author: Zen and the Art of Computer Programming
1 Introduction
NoSQL (Not Only SQL) is a general term that refers to non-relational database management systems. NoSQL is divided into four types: key-value storage, document storage, column storage, and graph database. This article will compare the characteristics, applicable scenarios, and differences and connections between three NoSQL database technologies: Redis, MongoDB, and Cassandra. It will also explore the application of NoSQL technology in enterprise-level development based on actual cases.
2. Keywords: NoSQL, Redis, MongoDB, Cassandra, distributed database, data storage, document database, column storage, key-value pair storage, graph database, function comparison, applicable scenarios, characteristics, case practice.
3.Related reading
4.Redis
4.1 Conceptual understanding
Redis is a completely open source and free in-memory key-value database. It supports rich data structures, so it can be used to implement various application scenarios, such as caching, message queues, counters, etc. It supports client libraries for multiple programming languages, including Java, Python, Ruby, PHP, JavaScript, Go, and more. Redis provides the command line tool redis-cli, which can be interacted with directly on the command line and can be used to create, delete, and modify objects in the database.
4.1.1 Data types
Redis supports five data types: String, hash table Hash, set, ordered set Zset, and HyperLogLog. Among them, String, Hash and Set respectively correspond to the most basic data types in Redis. The String type is used to save a small amount of short text, and its maximum capacity is 512M. The Hash type can be used to save key-value pair attributes, that is, key-value