Concept

Unisys OS 2200 databases

Résumé
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), network (DMS), and relational (RDMS) data models all share a common locking, recovery, and clustering mechanism. OS 2200 applications can use any mixture of these data models along with the high-volume transaction file system within the same program while retaining a single common recovery mechanism. The database managers are implemented as a protected subsystem and are called a procedure from user programs and other subsystems. The implementation as a subsystem means that there is no upper limit to the potential concurrency of activities (threads) executing in the database manager. The thread of each user executes the database manager code but within its protection domain so that misbehaved and malicious programs cannot affect the integrity of t
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