为了在创建表之后节省输入时间，您可以使用一个特性定义一些初始数据，从而在创建表时填充这些数据。
To save time entering data after you create the tables, you can use a feature for defining some initial data to be populated as you create tables.
在初始数据加载上下文中测量一些常用特性的性能开销。
Measure performance overhead of some commonly used features, in the context of initial data loading.
如果初始定义指定它们为可配置的，那么升级特性仍是可配置的。
Promoted properties are configurable if their original definition specifies they are configurable.
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