1. PostgreSQL：
PostgreSQL是一个功能强大的开源对象关系数据库系统。它具有较高的稳定性，因此可以在较低的维护工作量下提供良好的性能。 PostgreSQL是第一个实现多版本并发控制(MVCC)功能的DBMS。
2. 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。
PostgreSQL和Teradata之间的区别：
| SR.NO | PostgreSQL | Teradata |
|---|---|---|
| 1 | It is developed by PostgreSQL Global Development Group in 1989. | It is developed by Teradata Corp. in 1984. |
| 2 | PostgreSQL server operating systems are FreeBSD, HP-UX, Linux, NetBSD, OpenBSD, OS X, Solaris, Unix and Windows. | Teradata server operating systems are Linux, hosted. |
| 3 | The primary database model for PostgreSQL is Relational DBMS. | The primary database model for Teradata is Relational DBMS. |
| 4 | It is a open source software framework. | It runs world’s largest commercial databases. |
| 5 | Famous companies like National Audubon Society, Inc., FreshRealm, LLC, TIME Systems etc uses PostgreSQL. | Famous companies like Cognizant, Capgemini, aws, Cisco, Citibank, etc use Teradata. |
| 6 | It do not support In-memory capabilities. | It support in-memory capabilities. |
| 7 | It provides us with Immediate Consistency method to ensure consistency in a distributed system. | It also provides us with Immediate Consistency method to ensure consistency in a distributed system. |
| 8 | It supports Master-Slave Replication. | It supports both Master-Slave Replication and Master-Master Replication. |
| 9 | It supports C, .Net, C++, Java, JavaScript, PHP, Python, Ruby. | It supports C, C++, Cobol, Java (JDBC-ODBC), Perl, PL/1, Python, R, Ruby. |
| 10 | It provides access rights for users and roles. | It provide fine grained access rights according to SQL-standard. |