1·Specify attribute types and cardinality: Specify several properties of one attribute, and then repeat that step for all attributes.
指定属性类型和基数：指定一个属性的几个特征，然后为所有属性重复该步骤。
2·You may have noticed that the query access plan itself did not change with the increase in cardinality estimate.
您可能已经注意到了，查询访问计划本身并未随着基数估计值的增大而改变。
3·At each operator in the access plan, the optimizer estimates the cardinality output from the operator.
对于访问计划的每个操作符，优化器将估计该操作符的基数输出。
4·They define a template for instances of business objects and enable you to specify properties and relationships, as well as define custom cardinality.
业务模型为业务对象的实例定义一个模板，并让您能够指定属性和关系以及定义定制基数。
5·Therefore, omitting the maximum cardinality does not have any impact on the amount of allocated memory.
因此，省略最大基数不会对已分配的内存量产生任何影响。