... Changing the length of an object: 改变对象的长度 Getting and setting attributes: 访问和设置属性 The class of an object: 对象的类 ...
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如果可以访问属性，就意味着可以设置和获得其值。
If you can access a property, it means that you can set and get its value.
可以设置一些系统属性，来控制访问级别和虚拟机数据从 JMX 代理向管理客户机传递虚拟机数据的方式。
There are some system properties that you can set to control the level of access and the way in which VM data is transmitted from the JMX agent to the management client.
将该属性设置为 “TRUE” 表示必须使用所有合适的关系和 XML 索引来访问表，而不会考虑成本问题。
Setting the attribute to 'TRUE' indicates that all applicable relational and XML indexes must be used to access the table, irrespective of cost. The optimizer then chooses one of the following plans
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