Recognition Signals
Limited resources
Concert tickets, auction items, flash-sale inventory, or drivers/riders have one winner.
Double-booking risk
Seats, payments, and meeting rooms need coordination to prevent duplicate claims.
Concurrent state writes
Balances, inventory, and shared edits need consistency under simultaneous updates.
Order-sensitive operations
Across servers, simultaneous operations can change outcomes based on commit order.
Selection Ladder
Isolation Levels
Common Pitfalls
Distributed Locks
Lease Stores
TTL Examples
Interview Moves
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