由于没有默认设置，所以必须创建一个条目。
There is no setting by default, so you must create an entry.
对于匹配TOPIC对象的主题字符串，以及主题树中该主题字符串之下、没有定义与之匹配的TOPIC对象的各个主题，此TOPIC对象为它们提供默认设置。
The topic object provides default Settings for the topic string that matches it, as well as topics under it in the topic tree that do not have a topic object defined to match them.
这些是没有用于表空间的系统文件缓存的默认设置的结果。
These results are for our default setup with no file system caching for table Spaces.
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