Long-running transactions (also known as the saga interaction pattern) are computer
database transaction
A database transaction symbolizes a unit of work, performed within a database management system (or similar system) against a database, that is treated in a coherent and reliable way independent of other transactions. A transaction generally repr ...
s that avoid
locks on non-local resources, use compensation to handle failures, potentially aggregate smaller
ACID
In computer science, ACID ( atomicity, consistency, isolation, durability) is a set of properties of database transactions intended to guarantee data validity despite errors, power failures, and other mishaps. In the context of databases, a s ...
transactions (also referred to as
atomic transaction
In database systems, atomicity (; from grc, ἄτομος, átomos, undividable) is one of the ACID (''Atomicity, Consistency, Isolation, Durability'') transaction properties. An atomic transaction is an ''indivisible'' and '' irreducible'' s ...
s), and typically use a coordinator to complete or abort the transaction. In contrast to
rollback
In political science, rollback is the strategy of forcing a change in the major policies of a state, usually by replacing its ruling regime. It contrasts with containment, which means preventing the expansion of that state; and with détente ...
in ACID transactions, compensation restores the original state, or an equivalent, and is business-specific. For example, the compensating action for making a hotel reservation is canceling that reservation.
A number of protocols have been specified for long-running transactions using Web services within business processes. OASIS Business Transaction Processing and WS-CAF
are examples. These protocols use a coordinator to mediate the successful completion or use of compensation in a long-running transaction.
See also
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Optimistic concurrency control Optimistic concurrency control (OCC), also known as optimistic locking, is a concurrency control method applied to transactional systems such as relational database management systems and software transactional memory. OCC assumes that multiple tran ...
*
Long-lived transaction
A long-lived transaction is a transaction that spans multiple database transactions. The transaction is considered "long-lived" because its boundaries must, by necessity of business logic, extend past a single database transaction. A long-lived t ...
References
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Data management
Transaction processing