1. 卡桑德拉：
Cassandra 是一个免费、开源、分布式、广泛的列存储、NoSQL 数据库管理系统。它由 Apache 软件基金会开发，最初于 2008 年 7 月发布。Cassandra 旨在处理跨多个商用服务器的大量数据，提供高可用性且无单点故障。
2. Redis :
Redis 代表远程字典服务器，它是一个内存数据结构项目，实现了具有可选持久性的分布式内存键值数据库。 Redis 由 Redis 实验室开发，最初于 2009 年 5 月 10 日发布。它是用 ANSI 和 C 语言编写的。 Redis 提供了内存效率、运行速度快、高可用性，并提供了一些特性，如持久性、复制、集群等。
Cassandra 和 Redis 的区别：
| S.No. | CASSANDRA | REDIS |
|---|---|---|
| 1. | It was developed by Apache Software Foundation and released in July 2008. | It was developed by Redis labs and initially released on May 10, 2009. |
| 2. | Cassandra is written only in Java language. | Redis is written in ANSI and C languages. |
| 3. | The primary database model for Cassandra is Wide Column Store. | The primary database model for Redis is Key-Value Store. |
| 4. | The secondary indexes in Cassandra is restricted. | Redis supports secondary indexes with RediSearch module only. |
| 5. | There is no server-side scripting in Cassandra. | The Server-side scripting in Redis is through Lua. |
| 6. | It supports Selectable Replication Factor replication method. | It supports Master-Slave Replication and Multi-Master Replication. |
| 7. | It supports Map Reduce method. | It does not support Map Reduce method. |
| 8. | It does not have any in-memory capabilities. | It has in-memory capabilities. |
| 9. | Server operating systems for Cassandra are BSD, Linux, OS X, Windows. | Server operating systems for Redis are BDS, Linux, OS X and Windows. |
| 10. | Famous companies like GitHub, Hulu, Instagram, Reddit, The Weather Channel, etc uses Cassandra. | Famous companies like Snapchat, Craigslist, Digg, StackOverflow, Flickr, etc uses Redis. |