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· 9 min read
Ilias Lolis

Redis Fundamentals

Redis is a high-performance, distributed, in-memory data store that can be used as a database, cache or message broker. It is an open-source, NoSQL database that is designed to deliver high performance and low latency access to data. The core difference between Redis and a traditional database such as Postgres, MySQL and DynamoDB is that Redis stores data in memory and not in disk, a feature that gives Redis ultra fast response times.

However, the approach of storing data in-memory can be prone to data loss in the event of a system crash or power failure. In contrast, storing data persistently on disk provides durability, but at the cost of slower access times due to disk I/O. In this article, we will discuss methods for configuring Redis to be more resilient, as an out-of-the-box configuration of Redis could result in complete data loss if your Redis instance crashes.