877.txt

来自「This complete matlab for neural network」· 文本 代码 · 共 29 行

发信人: fervvac (高远), 信区: DataMining
标  题: Re: 数据仓库里的实体化视图怎么实现？
发信站: 南京大学小百合站 (Tue Sep 10 22:46:30 2002), 站内信件

What is your question?

To compute the MV, you simple modify existing cube computation algorithms to 
skip those cuboids that do not need to be materialized. The modification is
straigh-forward for both top-down and bottom-up algorithms.

If you are asking for the physcial storage format, I think the commercial 
systems still store the data in relational tables.

There is another line of approaches that use multidimensional model for the 
cube/cuboids. They store the pre-computed results in chunks.

【 在 netsaint (大圣) 的大作中提到: 】
: 很多文章都是空谈，到底怎么实现呢？
: 是自己定义格式还是借助别人已有的格式
: 
: 欢迎提供线索，资源
: 
: [e-mail]
: 


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