目录方案一：垂直分表方案二：水平分表（取模+范围）方案三：分区表三种方案大PK：选错的代价有多惨？最后给你划重点今天咱们不整那些花里胡哨的理论，就拿真实场景说事。假设你负责的订单系统，单表数据量飙到3000万
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