Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The OS 2200 database managers are all part of the Universal Data System. UDS provides a common control structure for multiple different data models. Flat files, network, and relational 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 within the same program while retaining a single common recovery mechanism.

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