What is pessimistic locking and how is it implemented?
An example of an AI chatbot conversation about pessimistic locking implementation in databases.
What is pessimistic locking and how is it implemented?
Pessimistic locking is a concurrency control mechanism that prevents multiple transactions from modifying the same data simultaneously. It locks the data for the duration of a transaction.
Can you explain how to implement pessimistic locking in a database?
To implement pessimistic locking, you typically use SQL commands like SELECT ... FOR UPDATE to lock the rows you want to modify. This ensures that other transactions cannot access these rows until the lock is released.
What are the advantages and disadvantages of using pessimistic locking?
Advantages include data integrity and preventing lost updates. Disadvantages are potential performance bottlenecks and deadlocks.
Are there any alternatives to pessimistic locking?
Yes, alternatives include optimistic locking, where transactions proceed without locking and check for conflicts before committing.
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