Unisys OS 2200 databases

The <a href="/facts/Unisys_OS_2200_operating_system/ChN2yNmR">OS 2200</a> database managers are all part of the Universal Data System (UDS). UDS provides a common control structure for multiple different <a href="/facts/Data_model/j1YyzpJ3">data models</a>. <a href="/facts/Flat-file_database/aNeNVE3h">Flat files</a> (sequential, multi-keyed indexed sequential, MSAM, and fixed-block), <a href="/facts/Network_model/3YU8MDPB">network</a>, and <a href="/facts/Relational_database/pEKGmJLy">relational</a> 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 <a href="/facts/Unisys_OS_2200_operating_system/ChN2yNmR">protected subsystem</a> and are called procedures in user programs and other subsystems. The database managers support access using many common distributed data access protocols and <a href="/facts/API/GMlN4vUr">APIs</a>, including <a href="/facts/Java_Database_Connectivity/uUVYg2sB">JDBC</a>, <a href="/facts/OLE_DB/YjelpY3o">OLE DB</a>, and <a href="/facts/Open_Database_Connectivity/2dV2Fm5j">ODBC</a>.
The heart of the database and transaction system is Integrated Recovery. "Integrated" implies the integration of all data models, the transaction file manager, the transaction scheduler, and the <a href="/facts/Message_queue/Kq7kX86w">message queues</a>. All activity in all of these areas is <a href="/facts/Journal_(computing)/R7fDybpe">journaled</a> (written on the <a href="/facts/Audit_trail/s3nQzrF4">audit trail</a>). The audit trail is managed by Exec which ensures <a href="/facts/Synchronization/L39sYwbr">synchronization</a> for all users. The Integrated Recovery Utility (IRU) provides database backup synchronized with executing transactions and audit trails.

Unisys OS 2200 databases open-in-new

Unisys OS 2200 databases