每个数据库的一个主数据文件属于主文件组。
A of every database advocate data file belongs to main body of a court verdict group.
查找无主文件和组只是完成了一半任务：还需要确定谁应该拥有它们及其应具有何种组权限。
Finding unowned files and groups is only half the battle: you also have to decide who should own them and what group permissions they should have.
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