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In computing, a blind write occurs when a transaction writes a value without reading it. Any view serializable schedule that is not conflict serializable must contain a blind write. In particular, a write w i (X) is said to be blind if it is not the last action of resource X and the following action on X is a write w j (X).
At least one of the actions is a write operation. The actions access the same object (read or write). [4] [5] Equivalently, two actions are considered conflicting if and only if they are noncommutative. Equivalently, two actions are considered conflicting if and only if they are a read-write, write-read, or write-write conflict.
In computer science, in the field of databases, write–write conflict, also known as overwriting uncommitted data is a computational anomaly associated with interleaved execution of transactions. Specifically, a write–write conflict occurs when "transaction requests to write an entity for which an unclosed transaction has already made a ...
Databases and other data stores which treat the integrity of data as paramount often include the ability to handle transactions to maintain the integrity of data. A single transaction consists of one or more independent units of work, each reading and/or writing information to a database or other data store.
In computer science, particularly the field of databases, the Thomas write rule is a rule in timestamp-based concurrency control. It can be summarized as ignore outdated writes . It states that, if a more recent transaction has already written the value of an object, then a less recent transaction does not need to perform its write since the ...
Isolation is typically enforced at the database level. However, various client-side systems can also be used. It can be controlled in application frameworks or runtime containers such as J2EE Entity Beans [2] On older systems, it may be implemented systemically (by the application developers), for example through the use of temporary tables.
Specifically, a write–read conflict occurs when "a transaction requests to write an entity, for which an unclosed transaction has already made a read request." [1]
Erlang is a functional language.Mnesia builds on this to obtain ACID transaction support. The functional block which is run as a transaction is a commonplace Erlang construct called a Functional Object (or Fun) [10] and is called by the single Mnesia statement mnesia:transaction(F).