Final answer:
Concurrency control in a DBMS may abort a transaction if there is a violation of serializability or a deadlock situation, ensuring data consistency and integrity.
Step-by-step explanation:
The method that may decide to abort a transaction, to be restarted later, because it violates serializability or because several transactions are in a state of deadlock, is commonly performed by the concurrency control mechanisms in a database management system (DBMS). These mechanisms ensure that database transactions are performed in a secure and reliable manner, maintaining data consistency and integrity. One common method of concurrency control is locking, which can lead to deadlocks that the system must detect and resolve. If a transaction cannot continue without violating the principles of serializability, which ensure that transactions are executed in a manner equivalent to some serial order, it will be aborted and then rescheduled to run at a later time.