What are database deadlocks and how can I resolve them?

What are database deadlocks and how can I resolve them?

Database deadlocks occur when two or more transactions block each other, preventing them from proceeding. To resolve them, you can implement deadlock detection algorithms, use timeout settings, or design your transactions to avoid locking resources in a conflicting order.

Can you give me an example of a deadlock situation?

Sure! Imagine Transaction A locks Resource 1 and needs Resource 2 to proceed, while Transaction B locks Resource 2 and needs Resource 1. Both transactions are waiting for each other, creating a deadlock.

How can I prevent deadlocks in my database?

To prevent deadlocks, you can ensure that all transactions acquire locks in a consistent order, keep transactions short, and avoid user interaction during transactions.

What tools can help me monitor deadlocks?

Many database management systems have built-in tools for monitoring deadlocks, such as SQL Server's Deadlock Graph or MySQL's InnoDB status. You can also use third-party monitoring tools.