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nextSlot+1后，scan到的slot可能是比nextSlot大，导致迭代到的第一个key可能是新slot的第一个key，该key的dbId大概率是0，导致其他dbId的数据只能scan到一个slot的数据
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Scan非db0的数据时，会出现scan返回数据缺失的问题
nextSlot+1后，scan到的slot可能是比nextSlot大，导致迭代到的第一个key可能是新slot的第一个key，该key的dbId大概率是0，导致其他dbId的数据只能scan到一个slot的数据
所以当cursor seek到下一个slot时，如果slot不是指定的prefix，那就从这个slot的需要的db重新查一次