what is deadlock in dbms

In a database management system (DBMS), a deadlock occurs when two or more transactions are waiting for each other to release resources, such as locks on database objects, that they need to complete their operations. Deadlocks can happen in multi-user environments when two or more transactions are running concurrently and try to access the same data in a different order. When a deadlock occurs, all activity comes to a halt and remains at a standstill forever unless the DBMS detects the deadlock and aborts one of the transactions. Deadlocks can result in increased resource usage, performance degradation, and reduced user satisfaction. Deadlock detection is an important technique for ensuring the correct functioning of a DBMS, and it allows the system to identify and resolve deadlocks in a timely manner, reducing the risk of system failure. Deadlock prevention in DBMS is a technique used to eliminate the possibility of deadlocks occurring in a database management system.