数据库序列的增量应该设置为increment_size参数值。

Your database sequence should increment by the increment_size parameter value.

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组号取自数据库序列的下一个可用值，Hi值由Hibernate定义，是组号乘以increment_size参数值。

The group number comes from the database sequence's next available value. The Hi value is defined in Hibernate as the group number multiplied by the increment_size parameter value.

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