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The OS 2200 database managers are all part of the Universal Data System (UDS). UDS provides a common control structure for multiple different data models. Flat files (sequential, multi-keyed indexed sequential – MSAM, and fixed-block)<ref>Unisys Corporation (1997). <u>Shared File System (SFS 2200) Administration and Support Reference Manual</u>. (Unisys publication 7831 0786). Roseville, MN. http://public.support.unisys.com/2200/docs/cp12.0/pdf/78310786-002.pdf </ref>, [[Network model|network]] (DMS)<ref>Unisys Corporation (1999). <u>Data Management System (DMS 2200) Schema Data Definition Language (DDL) Administration, Operations, and Programming Guide</u>. (Unisys publication 7831 0745). Roseville, MN. http://public.support.unisys.com/2200/docs/cp12.0/pdf/78310745-004.pdf </ref>, and [[Relational database|relational]] (RDMS)<ref>Unisys Corporation (1998). <u>Relational Data Management System (RDMS 2200) and IPF SQL Interface End Use Guide</u>. (Unisys publication 7831 0778). Roseville, MN. http://public.support.unisys.com/2200/docs/cp12.0/pdf/78310778-002.pdf </ref> data models all share a common locking, recovery, and clustering mechanism. OS 2200 applications can use any mixtures of these data models along with the high-volume transaction file system<ref>Unisys Corporation (1995). <u>Transaction Processing Conceptual Overview</u>. (Unisys publication 7830 9960). Roseville, MN. http://public.support.unisys.com/2200/docs/cp12.0/pdf/78309960-003.pdf </ref> within the same program while retaining a single common recovery mechanism.<ref>Unisys Corporation (2009). <u>Universal Data System Administration and Support Reference Manual</u>. (Unisys publication 7831 0737). Roseville, MN. http://public.support.unisys.com/2200/docs/cp12.0/pdf/78310737-017.pdf </ref> For more information about OS 2200 see [[Unisys OS 2200 operating system]].
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