As a pioneer in the field of relational database, IBM completed the prototype of SystemR system in 1997, and began to provide integrated database server-System/38 in 1980, followed by SQL/DSforVSE and VM. Its initial version is closely related to the research prototype of SystemR. DB2forMVSV 1 was introduced in 1983. The goal of this version is to provide the simplicity, data independence and user productivity promised by this new scheme. 1988 DB2forMVS provides powerful online transaction processing (OLTP) support, 1989 and 1993 realize distributed database support with remote work units and distributed work units respectively. The recently launched DB2UniversalDatabase6. 1 is the model of UniversalDatabase, the first multimedia relational database management system with online function, and supports a series of platforms including Linux.
2. Oracle
Oracle Bone Inscriptions, formerly known as SDL, was founded by LarryEllison and two other programmers in 1977. They developed their own fist products and sold them in large quantities in the market. 1979, Oracle launched the first commercial SQL relational database management system. Oracle Company is one of the earliest manufacturers to develop relational databases, and its products support the most extensive operating system platforms. At present, the market share of Oracle relational database products is among the best.
3.Informix
Informix was founded in 1980, providing professional relational database products for Unix and other open operating systems. The company name Informix is taken from the combination of Information and Unix. Informix's first relational database product that really supports SQL language is InformixSE (). InformixSE was the main database product under the microcomputer Unix environment at that time. It is also the first commercial database product transplanted to Linux.
4. Sybase
Sybase company was founded in 1984. The company name "Sybase" comes from the combination of "system" and "database". BobEpstein, one of the founders of Sybase Company, is the main designer of Ingres University Edition (a relational database model product at the same time as System/R). The company's first relational database product was10, which was launched in May 1987. Sybase first put forward the idea of client/server database architecture, and took the lead in implementing it in SybaseSQLServer.
5.SQLServer
1987, Microsoft cooperated with IBM to develop OS/2, and IBM bound the OS/2 database manager to the OS/2 system it sold, but Microsoft still lacked database products in its product line. Therefore, Microsoft turned its attention to Sybase and signed a cooperation agreement with Sybase to develop a relational database based on OS/2 platform by using Sybase technology. 1989, Microsoft released the 1.0 version of SQL Server.
6. A database system
PostgreSQL is a free software object with complete characteristics-Relational Database Management System (ORDBMS), and many of its characteristics are the predecessors of many commercial databases today. PostgreSQL originally started with the Ingres project of BSD. The features of PostgreSQL cover SQL-2/SQL-92 and SQL-3. First of all, it contains the support of the richest data types in the world. Secondly, PostgreSQL is the only free software database management system that supports transaction, sub-query, multi-version parallel control system and data integrity check.
7.mySQL
MySQL is a small relational database management system, which was developed by MySQLAB Company in Sweden. It was acquired by Sun Company on June 65438+ 10/6, 2008. At present, MySQL is widely used in small and medium-sized websites on the Internet. Because of its small size, high speed and low total cost of ownership, especially open source, many small and medium-sized websites choose MySQL as the website database to reduce the total cost of ownership.