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  1. 使用事实表+汇总表+分布表架构:
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  3. 事实表: 明细表, 使用`MergeTree`引擎;
  4. 汇总表: 是对事实表按照主键进行指标汇总的表, 使用`SummingMergeTree`引擎;
  5. 分布表: 建立在多台本地的事实表和汇总表之上.
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  7. 如果事实表过大的话, 使用汇总表+汇总表+分布表的架构.
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  10. 如果
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