IBM SQL/DS

SQL/DS (Structured Query Language/Data System), released in 1981, was IBM's first commercial relational-database management system.[1] It implemented the SQL database-query language.

SQL/DS ran on the DOS/VSE and VM/CMS operating systems. A little later, IBM also introduced DB2, another SQL-based DBMS, this one for the MVS operating system. The two products have coexisted since then; however, SQL/DS was rebranded as "DB2 for VM and VSE" in the late 1990s.

References
  1. S. Sumathi, S. Esakkirajan (13 Feb 2007). Fundamentals of Relational Database Management Systems. Springer. ISBN 3540483977. The product was called SQL/DS (Structured Query Language/Data Store) and ran under the DOS/VSE operating system environment
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