What are the different concurrency control techniques in databases?

What are the different concurrency control techniques in databases?

Concurrency control techniques are methods used to manage simultaneous operations on a database without conflicting. The main techniques include locking, timestamp ordering, and optimistic concurrency control.

Can you explain how locking works in concurrency control?

Locking involves restricting access to a database resource to ensure that only one transaction can modify it at a time. There are different types of locks, such as exclusive and shared locks.

What are the advantages and disadvantages of using optimistic concurrency control?

Optimistic concurrency control allows transactions to proceed without locking resources, which can improve performance. However, it may lead to higher chances of conflicts and rollbacks if multiple transactions try to modify the same data.

How does timestamp ordering differ from other techniques?

Timestamp ordering assigns a unique timestamp to each transaction, determining the order of execution. This method helps maintain consistency without locking but can be complex to implement.