SQL Server 7.0 also introduced a multi-dimensional database product called SQL OLAP Services (which became Analysis Services in SQL Server 2000). User Mode Scheduling (UMS) was introduced to handle SQL Server threads better than Windows preemptive multi-threading, also adding support for fibers (lightweight threads, introduced in NT 4.0, which are used to avoid context switching ). Extents thereby grew from 16k bytes to 64k bytes. Data pages were enlarged from 2k bytes to 8k bytes. SQL Server 7.0 was a major rewrite (C++) of the older Sybase engine, which was coded in C. (In 1996 Sybase changed the name of its product to Adaptive Server Enterprise to avoid confusion with Microsoft SQL Server.) Until 1994, Microsoft's SQL Server carried three Sybase copyright notices as an indication of its origin. Microsoft negotiated exclusive rights to all versions of SQL Server written for Microsoft operating systems. SQL Server 6.0 was the first version designed for NT, and did not include any direction from Sybase.Ībout the time Windows NT was released in July 1993, Sybase and Microsoft parted ways and each pursued its own design and marketing schemes. SQL Server 4.2 was shipped in 1992, bundled with OS/2 version 1.3, followed by version 4.21 for Windows NT, released alongside Windows NT 3.1.

This was the first version of Microsoft SQL Server, and served as Microsoft's entry to the enterprise-level database market, competing against Oracle, IBM, Informix, Ingres and later, Sybase. On June 12, 1988, Microsoft joined Ashton-Tate and Sybase to create a variant of Sybase SQL Server for IBM OS/2 (then developed jointly with Microsoft), which was released the following year. Legend: Old version Older version, still maintained Latest versionĭetailed history Genesis Older version, yet still maintained: 15.0

Older version, yet still maintained: 14.0 Older version, yet still maintained: 13.0 Older version, yet still maintained: 12.0 Older version, yet still maintained: 10.25

Old version, no longer maintained: 4.21a ( WinNT) Old version, no longer maintained: 4.2B ( OS/2) Old version, no longer maintained: 4.2A ( OS/2) Old version, no longer maintained: 1.1 ( OS/2) Old version, no longer maintained: 1.0 ( OS/2) The history of Microsoft SQL Server begins with the first Microsoft SQL Server database product – SQL Server v1.0, a 16-bit relational database for the OS/2 operating system, released in 1989.

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