𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲 𝗔𝗖𝗜𝗗 𝗔𝘁𝗼𝗺𝗶𝗰𝗶𝘁𝘆
ACID keeps your database data correct.
Here is the breakdown:
- Atomicity: All steps succeed or all fail.
- Consistency: Data follows your rules.
- Isolation: Transactions do not clash.
- Durability: Data stays safe after a crash.
Focus on Atomicity. It means all or nothing.
Think of a payment process:
- Mark order as resolved.
- Add money to user wallet.
- Update total spent.
- Write a log.
Step 2 fails. Step 1 stays in the database. The user sees a success message. The money is missing. Your data is now wrong.
The fix is a transaction. Group all these steps. If one step fails, the database rolls back. Everything returns to the start. Your data stays clean.