- Q: What is the importance of transactions?
- A: They make it possible to build robust, reliable systems
- Transactions preserve the ACID properties:
- Atomic - Changes occur all or none
- Consistent - System progresses from one consistent state to the next
- Isolated - Activities within a transaction are not visible outside the transaction
- Durable - The results of a committed transaction cannot be lost
- From a programming point of view a transaction is like synchronized on steroids
- synchronized provides isolation, but not the other properties
- Transactions mean you don't need to worry about concurrency
- Transactions mean you don't need to worry about crashes
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