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What are the transaction isolation levels in EJB?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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