Concurrency control and locking is the mechanism used by
DBMSs for the sharing of data.
Atomicity, consistency, and isolation are achieved through concurrency control
and locking.
See ACID properties (new
window).
When many people may be reading the same data item at the same time, it is usually necessary to ensure that only one application at a time can change a data item.
Locking is a way to do this. Because of locking, all changes to a particular data item will be made in the correct order in a transaction.
See isolation (new
window).
The amount of data that can be locked with the single instance or groups of instances defines the granularity of the lock.
The types of granularity are illustrated here are:
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