What is pessimistic locking?

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Tags

1. #committed
2. #rolled
3. #whatever
4. #locked
5. #exists
6. #pessimistic
7. #first
8. #transactional
9. #actually
10. #until
11. #transaction
12. #accessed
13. #locking
14. #optimistic
15. #usually
16. #isolation
17. #resource
18. #either
19. #implemented