Ensure that the logical database name is selected (in this example, MAR), and then click Properties.
确保这个逻辑数据库名称已经被选中(在这个例子中是，MAR)，然后点击Properties。
A logical identifier must not be the same as the name of the physical database.
一个逻辑的标识不能与物理数据库的名称相同。
Slice does not require such additional schema-level information because it maintains the association between a persistence instance and its original database partition via its logical name.
Slice 不 需要这类额外的模式层的信息，因为它根据持久性实例的逻辑名维护了实例和其原始数据库分区间的关联。
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