"The control of concurrent access. SQL Server uses locking to allow multiple users to access and change shared data at the same time without conflicting with one another." (Microsoft Corporation, "SQL Server 7.0 System Administration Training Kit", 1999)
"Concurrency control is the control on the database and transactions which are executed concurrently to ensure that each transaction completed healthy." (S. Sumathi & S. Esakkirajan, "Fundamentals of Relational Database Management Systems", 2007)
"Concurrency control ensures that database operations can be executed concurrently without compromising correctness. Pessimistic concurrency control, such as used in systems with locks, will block any potentially conflicting operations even if they may not turn out to actually conflict. Optimistic concurrency control, the approach used by WiredTiger, will delay checking until after a conflict may have occurred, aborting and retrying one of the operations involved in any write conflict that arises." (MongoDb, "Glossary", 2008)
"Mechanisms to ensure that a database remains consistent and accurate during concurrent use." (Jan L Harrington, "Relational Database Design and Implementation" 3rd Ed., 2009)
"A DBMS feature that is used to coordinate the simultaneous execution of transactions in a multiprocessing database system while preserving data integrity." (Carlos Coronel et al, "Database Systems: Design, Implementation, and Management" 9th Ed., 2011)
"The control of process contention for resources within multi-process systems." (DAMA International, "The DAMA Dictionary of Data Management", 2011)
No comments:
Post a Comment