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【单选题】
公司网络采用结构进行管理，域中有一台数据库服务器，为存贮公司数据，建立了名为information的数据库。用户反映每次向数据库的表中插入大量数据后，数据库的运行速度非常慢，甚至影响用户对数据库的正确使用。管理员（ ）操作，才可以解决该问题。A.
在表的主键上建立聚集索引
B.
在表的主键上建立非聚集索引
C.
在表的主键上建立唯一索引
D.
将数据库中各表的填充因子设为60
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