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dimension order in a outline

原创 Linux操作系统 作者:jerry_yin 时间:2012-02-25 08:47:31 0 删除 编辑

it's called modified hourglass model or hourglass model in a stick:

 

account dimension

time dimension

largest dense dimension

smallest dense dimension

smallest sparse dimension

largest sparse dimension

non-aggregate sparse dimension

 

this is due to

1) read block into memory is resource-consuming

2) search a block in index file is resource-consuming

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