Conflict set意思

"Conflict set" is a term used in various contexts, but it is most commonly used in the fields of computer science and database management systems (DBMS). In these contexts, a conflict set refers to a set of transactions that are in conflict with each other due to their attempts to modify the same data simultaneously.

In a DBMS, transactions are units of work that operate on a database. They can read and write data, and to ensure data consistency, transactions must be isolated from each other. Isolation means that if two transactions are accessing the same data, they should not interfere with each other. However, if two transactions try to modify the same data at the same time, they are in conflict, and the DBMS must resolve the conflict to maintain consistency.

A conflict set is a set of transactions that are involved in such a conflict. The DBMS may use various methods to resolve the conflict, such as locking, timestamp ordering, or multiversion concurrency control (MVCC). The goal is to ensure that only one of the conflicting transactions commits its changes to the database, while the others are rolled back or delayed until the conflict is resolved.

Conflict sets are an important concept in maintaining the ACID properties of a database system, which stand for Atomicity, Consistency, Isolation, and Durability. Isolation is particularly relevant here, as it ensures that transactions operate as if they are the only ones accessing the database, even though multiple transactions may be running concurrently.

In other contexts, such as mathematics or logic, "conflict set" may have different meanings depending on the specific application. It's important to consider the context in which the term is used to determine its precise definition.