Learn why committed data survives crashes, power outages, and system failures.
You just bought something online and received a confirmation email: "Your order has been processed."
Then the power goes out. Is your order really confirmed, or did it vanish into digital limbo?
This is where durability becomes your hero. When a says "COMMIT" (transaction complete), it's making a promise: "This data will survive whatever disaster comes next."
Here's what durability guarantees:
The only way you lose committed data is if the physical storage device is destroyed (and even then, you should have backups!).
Durability is why you can trust digital receipts, why your photos don't disappear from cloud storage, and why online banking actually works.
Durability is the database's way of saying 'I've written this in permanent ink' - once committed, your data has officially happened.
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