国外大的数据库叫什么

国外的大型数据库主要包括：Oracle、Microsoft SQL Server、IBM DB2、MySQL、PostgreSQL。其中，Oracle是全球最大的企业级数据库，被广泛应用于大型的企业级应用中。Oracle数据库以其强大的功能，卓越的性能，稳定的可靠性，在全球范围内拥有大量的用户。Oracle数据库支持大数据、云计算等最新的技术，因此在各行各业中都有着广泛的应用。例如，许多世界500强企业，大型金融机构，政府部门等都是Oracle数据库的用户。

一、ORACLE

Oracle 是一款来自美国Oracle公司的关系数据库管理系统。它是使用最为广泛的数据库之一，被广泛应用于各大公司和机构。Oracle数据库系统是一种完全关系数据库管理系统，其理论基础是E.F.Codd的关系模型。具有良好的安全性，完备的数据管理功能，以及优秀的性能和可扩展性，能够满足各种规模的业务需求。

二、MICROSOFT SQL SERVER

Microsoft SQL Server是微软公司推出的关系型数据库管理系统。该系统具有使用方便，性能高效，安全性好，价格适中等特点，被广泛应用于中小型企业。其主要竞争对手是Oracle数据库和IBM的DB2。

三、IBM DB2

IBM DB2是IBM公司的数据库产品，是一种关系型数据库。DB2提供了一种统一的开放的数据库环境，支持各种数据，包括关系数据，对象数据，文本，XML，时间序列数据等。DB2主要用于大型的企业级应用，特别是在金融，零售，电信等行业有广泛的应用。

四、MYSQL

MySQL是一种开源的关系型数据库管理系统，是全球使用最广泛的开源数据库之一。MySQL以其优秀的性能，丰富的功能，简单的使用和管理，以及优秀的扩展性，赢得了全球范围内的用户的喜爱。MySQL被广泛应用于互联网，电信，金融，广告，零售等行业。

五、POSTGRESQL

PostgreSQL是一种开源的对象关系型数据库系统，它是最先进的开源数据库之一。PostgreSQL支持大部分的SQL标准，并提供了很多现代特性，如复杂查询，外键，触发器，视图，事务完整性等。PostgreSQL在全球范围内有着广泛的用户，被广泛应用于互联网，电信，金融，广告，零售等行业。

相关问答FAQs：

Q: What is the name of a large database used in foreign countries?

A: One of the most well-known and widely used large databases in foreign countries is called "Oracle." Oracle is a relational database management system (RDBMS) that is used by various organizations and enterprises around the world. It offers a robust and scalable platform for storing and managing vast amounts of data.

Q: Are there any other popular large databases used internationally?

A: Yes, apart from Oracle, there are several other popular large databases used internationally. Some notable examples include:

1. MySQL: MySQL is an open-source relational database management system that is widely used for web-based applications. It is known for its speed, reliability, and ease of use. Many popular websites and content management systems (CMS) like WordPress use MySQL as their backend database.

2. Microsoft SQL Server: Microsoft SQL Server is a relational database management system developed by Microsoft. It is commonly used in enterprise-level applications and offers a wide range of features such as data integration, analysis, and reporting. SQL Server is known for its strong security measures and seamless integration with other Microsoft products.

3. PostgreSQL: PostgreSQL, often referred to as "Postgres," is an open-source object-relational database management system. It is known for its advanced features like support for JSON, full-text search, and geospatial data. PostgreSQL is highly customizable and offers excellent performance and scalability.

Q: How do these large databases differ from each other?

A: While all these large databases serve the purpose of storing and managing data, they have some key differences in terms of their features, architecture, and target audience. Here are some differentiating factors:

1. Architecture: Oracle, MySQL, and Microsoft SQL Server are all relational databases, meaning they store data in tables with predefined relationships. PostgreSQL, on the other hand, is an object-relational database, which allows users to define their own data types and create custom functions.

2. Scalability: Oracle and Microsoft SQL Server are designed to handle large-scale enterprise-level applications with millions of records. MySQL and PostgreSQL are also capable of handling large amounts of data, but they are often preferred for smaller to medium-sized applications.

3. Licensing: Oracle and Microsoft SQL Server are commercial databases that require a license for usage. MySQL and PostgreSQL, on the other hand, are open-source and free to use, which makes them popular choices for startups and small businesses.

4. Ecosystem: Each database has its own ecosystem of tools, libraries, and frameworks that are built around it. For example, Oracle has a wide range of enterprise-level tools and applications, while MySQL has a large community of developers creating plugins and extensions.

In conclusion, there are several large databases used internationally, including Oracle, MySQL, Microsoft SQL Server, and PostgreSQL. These databases differ in terms of architecture, scalability, licensing, and ecosystem, allowing users to choose the one that best fits their specific needs.