当您需要一个文件(或目录)别名时，您使用链接，目的可能是提供一个更方便、简短的路径。
You use links when you need an alias for a file (or directory), possibly to provide a more convenient or shorter path.
目录缓存器用于存储表描述符信息，而在先前的语句中引用表、视图或别名时将使用该信息。
The catalog cache is used to store table descriptor information that is used when the tables, views, or alias have been referenced in previous statements.
使用以下命令来创建实例别名和，并对一个远程DB 2实例目录进行分类。
Create the database alias and catalog a remote DB2 database using the following command.
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