Why Transactions Protect Money Moves
Explain how atomicity, consistency, isolation, and durability protect multi-row changes.
ACID is the difference between "the code ran" and "the fact is true." Atomicity Use it when a business event spans several rows. If one step fails, none of the event should remain. Consistency Put enforceable rules in constraints where possible. The database should reject impossible states before application code explains them. Isolation Pick isolation based on the anomaly you cannot tolerate: dirty reads, nonrepeatable reads, phantoms, or serialization anomalies. Durability Committed data is recoverable because the log is flushed before the data pages have to be.
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