What are some real-world examples of concurrency control?
Concurrency control is essential in databases to ensure data integrity. Examples include locking mechanisms, timestamps, and optimistic concurrency control.
Can you explain how locking mechanisms work?
Sure! Locking mechanisms prevent multiple transactions from accessing the same data simultaneously. There are two types: exclusive locks, which allow only one transaction to access the data, and shared locks, which allow multiple transactions to read the data but not modify it.
What about optimistic concurrency control?
Optimistic concurrency control allows transactions to proceed without locking resources. It checks for conflicts before committing changes, rolling back if necessary.
Are there any specific databases that use these methods?
Yes, databases like MySQL use locking mechanisms, while others like PostgreSQL support both locking and optimistic concurrency control.
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