Rows that have the same value in the clustering columns are physically stored together in the same storage cell.
在集群列内的值相同的行可被一起物理存储在同一个存储单元中。
We have evaluated this clustering for several sample queries that restrict their search to a single group_PDB value (i.e., "HETATOM") and found that it can improve query performance fourfold.
我们已经通过几个将搜索限制于单个group _ PD b值(即hetatom)的样例查询评估了这种集群并发现它能够将查询性能提高四倍。
The proposed method to cluster customers is to combine response-surface method, adaptive-conjoint analysis technology and system-clustering method according to the value of customers needs utility.
综合应用响应曲面法、适应性关联分析技术和系统聚类法，提出了根据客户需求效用值进行客户群聚类划分的新方法；
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