1. Transaction_read_uncommitted
Allows a method to read uncommitted data from a DB (fast but not wise).
2. Transaction_read_committed
Guarantees that the data you are getting has been committed.
3. Transaction_repeatable_read
Guarantees that all reads of the database will be the same during the transaction (good for read and update operations).
4. Transaction_serializable
All the transactions for resource are performed serial.
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