1. 甲骨文：
Oracle 是一个关系数据库管理系统 (RDBMS)。它由 Oracle Corporation 于 1980 年开发。它是第一个专为网格计算设计的数据库，可提供最灵活、最具成本效益的信息和应用程序管理方式。它可以在 Windows、Unix、Linux 和 macOS 等主要平台上运行。它是一种关系数据库，用户可以通过称为 SQL 的应用程序或查询语言访问其中的数据。
2. 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。 Oracle 和 Cassandra 的区别：
| S.NO. | ORACLE | CASSANDRA |
|---|---|---|
| 1. | It was developed by Oracle Corporation in 1980. | It was developed by Apache Software foundation in 2008. |
| 2. | It is written in C and C++. | It is written only in Java language. |
| 3. | It is a commercial software. | It is an open-source software. |
| 4. | Server operating systems for Oracle are Solaris, Linux, OS X, Windows. | Server operating systems for Cassandra are BSD, Linux, OS X, Windows. |
| 5. | Immediate Consistency method ensures consistency. | Eventual Consistency and Immediate Consistency method ensures consistency in a distributed system. |
| 6. | The primary database model is Relational DBMS. | The primary database model is Wide Column Store. |
| 7. | It uses Horizontal partitioning method for storing different data on different nodes. | It uses Sharding partitioning method for storing different data on different nodes. |
| 8. | The replication methods that Oracle supports are Master-Slave Replication, Master-Master Replication. | The replication method that Cassandra supports is Selectable Replication Factor. |
| 9. | ACID properties of transaction are used. | There are no transaction concepts. |
| 10. | It provides fine grained access rights according to SQL-standard. | It provides access rights for users can be defined per object . |