Transaction Processing
Transaction (tx) = application-level atomic op, multiple DB ops
Concurrent transactions are
- desirable, for improved performance
- problematic, because of potential unwanted interactions
To ensure problem-free concurrent transactions:
- Atomic ... whole effect of tx, or nothing
- Consistent ... individual tx's are "correct" (wrt application)
- Isolated ... each tx behaves as if no concurrency
- Durable ... effects of committed tx's persist
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