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DB2 is one of IBM's families of relational database management system (RDBMS) (or, as IBM now calls it, data server) software products within IBM's broader Information Management Software line. Although there are different "editions" and "versions" of DB2 which run on devices ranging from handhelds to mainframes, most often DB2 refers to DB2 Enterprise Server Edition or the top-of-the-line DB2 Data Warehouse Edition (DB2 DWE), which runs on Unix (AIX), Windows or Linux servers; or DB2 for z/OS. Alongside DB2 is another RDBMS: Informix, which was acquired by IBM in 2001.
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