Hibernate IDENTITY vs SEQUENCE entity identifier generators?

• The IDENTITY generator will always require a database hit for fetching the primary key value without waiting for the flush to synchronize the current entity state transitions with the database.

•  IDENTITY generator doesn't play well with Hibernate write-behind first level cache strategy.
• Insert a row without specifying a value for the ID. After inserting the row, ask the database for the last generated ID.
• The GenerationType.IDENTITY is the easiest to use but not the best one from a performance point of view.