advancedEntity Mapping — @Entity, @Id, Inheritance & Composite Keys
Why does GenerationType.IDENTITY prevent Hibernate from batching inserts efficiently?
IDENTITY relies on the database generating the primary key value at insert time, which means Hibernate must execute each insert individually to get back its generated ID before it can proceed — it can't pre-assign IDs and batch multiple inserts together the way GenerationType.SEQUENCE (with a configured allocationSize) can.
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