What is pessimistic control in database systems?
An example of an AI chatbot conversation about pessimistic control in database systems.
What is pessimistic control in database systems?
Pessimistic control is a concurrency control method that assumes conflicts will occur, locking resources to prevent them.
How does it differ from optimistic control?
Unlike optimistic control, which allows transactions to proceed without locking until commit time, pessimistic control locks resources upfront.
What are the advantages of using pessimistic control?
The main advantages include preventing lost updates and ensuring data consistency, especially in high-conflict environments.
Are there any downsides to using this method?
Yes, it can lead to reduced concurrency and increased wait times, as transactions may be blocked by locks.
In what scenarios is pessimistic control preferred?
It's preferred in environments with high contention for resources, such as banking systems or reservation systems.
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