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What are transaction isolation levels in EJB?
Transaction_serializable- All the transactions for resource are performed serial.      
Transaction_read_uncommitted- Allows a method to read uncommitted data from a DB.
Transaction_repeatable_read - Guarantees that all reads of the database will be the same during the transaction.
Transaction_read_committed- Guarantees that the data you are getting has been committed.
Posted By: Name:Rajesh Kr URL: What are transaction isolation levels in EJB?