What are transaction isolation levels in EJB?

<!--[if !supportLists]-->1. <!--[endif]-->Transaction_read_uncommitted- Allows a method to read uncommitted data from a DB(fast but not wise).
<!--[if !supportLists]-->2. <!--[endif]-->Transaction_read_committed- Guarantees that the data you are getting has been committed.
<!--[if !supportLists]-->3. <!--[endif]-->Transaction_repeatable_read – Guarantees that all reads of the database will be the same during the transaction (good for read and update operations).

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