GLOBAL_NAMES

GLOBAL_NAMES
GLOBAL_NAMES specifies whether a database link is required to have the same name as the database to which it connects.
If the value of GLOBAL_NAMES is false, then no check is performed. 
If you use or plan to use distributed processing, then Oracle recommends that you set this parameter to true to ensure the use of consistent naming conventions for databases and links in a networked environment.

Global_names 是一个布尔值，global_names的作用是创建db link时是否强制使用远程数据库的global_name,如果global_names=true,则db link name必须要求是remote database的global_name,否则创建之后db link 不能连同，缺省值是false。多用于分布式系统。