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本内容遵循CC 4.0 BY-SA版权协议 上周排查生产环境性能问题时，发现一个原本执行只需200ms的订单查询接口，突然恶化到8秒才能返回结果。经过层层排查，最终定位到是一条看似简单的统计SQL在作祟——当用户订单量突破50万后，全表扫描的代价开始显现。

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