https://wid-blog.github.io/en/tags/lock/Recent content in Lock on wid's blogHugoenSun, 01 Oct 2023 00:00:00 +0000https://wid-blog.github.io/en/posts/tech/database/optimistic-vs-pessimistic-lock/Sun, 01 Oct 2023 00:00:00 +0000https://wid-blog.github.io/en/posts/tech/database/optimistic-vs-pessimistic-lock/A transaction gives atomicity, a lock gives serialization — they aren’t substitutes. How pessimistic and optimistic locking cover the Lost Update that an isolation level’s plain reads don’t, and how to choose between them.