IBM Db2
relational model database server
Db2 is a family of data management products, including database servers, developed by IBM. It initially supported the relational model, but was extended to support object–relational features and non-relational structures like JSON and XML. The brand name was originally styled as DB2 until 2017, when it changed to its present form. In the early days, it was sometimes wrongly styled as DB/2 in a false derivation from the operating system OS/2.
History
DB2 traces its roots back to the beginning of the 1970s, when Edgar F. Codd, a researcher working for IBM, described the theory of relational databases, and in June 1970, published the model for data manipulation.
In 1974, the IBM San Jose Research Center developed a related database management system (DBMS) called System R, to implement Codd's concepts. A key development of the System R project was the Structured Query Language (SQL). To apply the relational model, Codd needed a relational-database language he named DSL/Alpha. At the time, IBM did not believe in the potential of Codd's ideas, leaving the implementation to a group of programmers not under Codd's supervision. This led to an inexact interpretation of Codd's relational model that matched only part of the prescriptions of the theory; the result was Structured English QUEry Language or SEQUEL.
IBM bought Metaphor Computer Systems to utilize their GUI interface and encapsulating SQL platform that had already been in use since the mid-80s.
In parallel with the development of SQL, IBM also developed Query by Example (QBE), the first graphical query language.
IBM's first commercial relational-database product, SQL/DS, was released for the DOS/VSE and VM/CMS operating systems in 1981.
The public source identifies “IBM Db2” as relational model database server. This brief keeps that definition visible, then builds a research path around relational, model and database.
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This entry incorporates text from “IBM Db2” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.