Meet the strictest isolation level that treats your database like there's only one user at a time, ensuring perfect consistency at the cost of performance.
Serializable is like having a strict librarian who only allows one person to read each book at a time - no exceptions!
When your transaction reads a row in Serializable mode, it's not just reading - it's locking. Other transactions can't even read that same row until you're completely done.
The Trade-off: Perfect consistency but terrible performance.
It's like having a highway where only one car can drive at a time.
Key Insight: Serializable eliminates all issues by essentially eliminating concurrency itself - transactions run as if they're the only one in the .
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