What are some real-world examples of pessimistic concurrency?

What are some real-world examples of pessimistic concurrency?

Pessimistic concurrency control is often used in database management systems. For instance, in banking systems, when a transaction is being processed, the account balance is locked to prevent other transactions from modifying it until the first one is complete.

Can you give me another example?

Sure! In reservation systems, like those for airlines or hotels, when a seat or room is being booked, it is temporarily locked to prevent double booking until the transaction is finalized.

What are the advantages of using pessimistic concurrency?

The main advantage is data integrity. By locking resources, it ensures that no conflicting changes occur, which is crucial in systems where accuracy is vital, like financial transactions.

Are there any downsides to this approach?

Yes, one downside is that it can lead to reduced performance due to waiting times for locks to be released, especially in high-traffic systems.