1. Teradata：
Teradata是Teradata Corp.生产的RDBMS。它用于管理大型数据仓库操作。 Teradata Corporation是与数据库和分析相关的软件，产品和服务的提供商。它接受来自多个客户端应用程序的请求数量。
2. CouchDB：
CouchDB是一个面向文档的开源NoSQL数据库。它由Apache软件基金会开发，主要关注易用性。 Apache CouchDB是最新的数据库之一。它是2005年发布的多主应用程序，于2008年成为Apache项目。它使用多种格式和协议来存储，传输和处理其数据。它是用Erlang编程语言编写的。
Teradata和CouchDB之间的区别：
| Teradata | CouchDB |
|---|---|
| It is developed by Teradata Corp. | It is developed by Apache Software Foundation. |
| It was released in 1984. | It was released in 2005. |
| Teradata server operating systems are Linux, hosted. | CouchDB server operating systems are Linux, OS X, Solaris, Windows. |
| The primary database model for Teradata is Relational DBMS. | The primary database model for CouchDB is Document Store. |
| Famous companies like Cognizant, Capgemini, aws, Cisco, Citibank, etc use Teradata. | Famous companies like Adobe, Amadeus, Lyft, ViaVarejo, Craftbase, etc uses CouchDB. |
| It provides us with Immediate Consistency method to ensure consistency in a distributed system. | It provides us with Eventual and Immediate Consistency method to ensure consistency in a distributed system. |
| It supports C, C++, Cobol, Java (JDBC-ODBC), Perl, PL/1, Python, R, Ruby. | It supports C, C#, C++, Clojure info, ColdFusion info, D info, Dart info, Delphi info, Erlang, Java, JavaScript, PHP, Python, Ruby. |
| It provide fine grained access rights according to SQL-standard. | It provides access rights for users and roles. |
| It supports both Master-Slave Replication and Master-Master Replication. | It supports Master-Slave Replication. |