Is redis a non-relational database?

Redis: Non-relational database

Redis is a non-relational database, also known as NoSQL database. Unlike traditional relational databases such as MySQL and PostgreSQL, Redis does not store data in relational tables, but uses a mechanism called key-value storage.

Key-value storage

Key-value storage is a data structure that maps unique keys to corresponding values. Redis uses key-value pairs to store and retrieve data. Keys can be strings, numbers, or other data types, while values ​​can be strings, hashes, lists, sets, and sorted sets.

Characteristics of non-relational databases

Non-relational databases have the following characteristics:

• No schema: Redis does not require pre-defined data structures, and data can be flexibly stored and retrieved.
• Key-value storage: Data is stored using key-value pairs, and accessing data is very fast.
• High concurrency: Redis can handle a large number of concurrent requests because it uses a single-threaded architecture to process data.
• Persistence: Redis provides persistence function to store data on disk to prevent data loss.

Usage scenarios of Redis

Redis is suitable for the following usage scenarios:

• Cache: Redis Frequently accessed data can be cached, thereby reducing pressure on the database.
• Session management: Redis can store and manage user session information.
• Queue: Redis can be used as a queue to process messages and tasks.
• Distributed lock: Redis can implement a distributed lock mechanism to prevent data competition during concurrency.

In short, Redis is a non-relational database that uses a key-value storage mechanism to store and retrieve data. Features include schema-less, key-value storage, high concurrency, and persistence. Redis is suitable for a variety of use cases, including caching, session management, queues, and distributed locks.

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