Explain the difference between pessimistic and optimistic concurrency control.
- Optimistic concurrency assumes conflicts are rare and allows transactions without locking, checking conflicts later.
- Optimistic concurrency is less scalable than pessimistic concurrency.
- Pessimistic concurrency allows only one transaction at a time.
- Pessimistic concurrency assumes conflicts and locks data during transactions.
Pessimistic concurrency control assumes conflicts may occur, so it locks data during transactions. In contrast, optimistic concurrency control assumes conflicts are rare and allows transactions without locking, checking for conflicts later in the process.
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