Deadlock wait is a situation in which multiple threads or processes are waiting for a resource held by another thread or process. This wait creates a circul...
Deadlock wait is a situation in which multiple threads or processes are waiting for a resource held by another thread or process. This wait creates a circular dependency that prevents any thread from making progress.
Example:
Imagine a scenario where two threads are waiting for resources:
Thread A needs resource B held by Thread B.
Thread B needs resource A held by Thread A.
Both threads are eager to proceed but are blocked by the other. This circular dependency prevents any thread from making any progress.
Causes of Deadlock Wait:
Mutual exclusion: Threads can only hold one resource at a time.
Hold and wait: Threads need to hold a resource before waiting for another.
No preemption: Once a thread starts waiting for a resource, it cannot be interrupted.
Consequences of Deadlock Wait:
Deadlock wait can lead to system performance degradation and even system crashes.
Deadlocks are difficult to detect and resolve.
Deadlock waits can occur when multiple transactions are executing concurrently, each waiting for the other to release a resource.
How to Avoid Deadlock Wait:
Design database transactions to avoid blocking operations.
Use constraints and indexes to enforce data integrity and prevent anomalies.
Use deadlock detection mechanisms, such as deadlock detection algorithms