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. 玛丽亚数据库：
MariaDB 是一个开源关系数据库管理系统 (RDBMS)，是广泛使用的 MySQL 数据库技术的兼容替代品。它由 MariaDB Foundation 开发并于 2009 年 10 月 29 日首次发布。MariaDB 具有大量新功能，这使其在性能和用户导向方面优于 MySQL。
Cassandra 和 MariaDB 的区别：
| S.NO. | cassandra | mariadb | ||||||
|---|---|---|---|---|---|---|---|---|
| 1. | Developed by Apache Software foundation and released on July 2008. | Developed by MariaDB Corporation Ab. and initially released on 29 October 2009. | ||||||
| 2. | Cassandra is written only in Java language. | MariaDB is written in C, C++, Perl and Bash languages. | ||||||
| 3. | Cassandra does not provides ACID transactions but can be tuned to support ACID properties. | MariaDB provides ACID transactions without snapshot isolation. | ||||||
| 4. | Cassandra supports Selectable Replication Factor replication method. | MariaDB supports Master-Slave Replication and Master-Master Replication replication methods. | ||||||
| 5. | In Cassandra there is no concept of Foreign keys | MariaDB provides the concept of Referential Integrity and have Foreign keys. | ||||||
| 6. | Cassandra supports Map Reduce method. | MariaDB does not supports Map Reduce method. | ||||||
| 7. | Cassandra does not supports XML data format. | Mariadb does supports XML data format. | ||||||
| 8. | Cassandra has only cursory support for secondary indexes i.e secondary indexing is restricted. | MariaDB does supports the concept of secondary indexes. | 9. | Server operating systems for Cassandra are BSD, Linux, OS X, Windows. | Server operating systems for MariaDB are FreeBSD, Linux, Solaris, Windows. | 10. | Famous companies like GitHub, GoDaddy, Hulu, Instagram, Reddit, The Weather Channel, etc uses Cassandra. | Famous companies like CUNY, Accenture, Docplanner, Nasdaq, Red Hat, ServiceNow, etc uses MariaDB. |