- A = Atomic
- Transaction operations are all performed or none are performed
- C = Consistent
- WRT some defined set of constraints
- Constraints define what consistent means
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- I= Isolated
- Each transaction sees the effects of all preceding transactions, but not the effect of overlapping transactions
- Parallel transactions must be serializable
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- D = Durable
- Each committed transaction is guaranteed to be applied to the database.
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