第三,由于聚集索引键是整个表中最冗余的数据,你应当确疑您的聚集键是不易变的(not volatile),如果一个聚集健转变,它有以下几个反作用:1、它会引止聚集索引内的记载的搬家,形成页page的分别取碎片。
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Dissolved mineral matter is not volatile at the boiling point of water and remains behind.
溶解的矿物质在水的沸点是不挥发的并留下。
Where sugar is clearly the solute, but sugar is not volatile clearly this is a bad example.
糖很显然是溶质,但糖是不可挥发的,所以这是个不好的例子。
And room temperature, it turns out if it's not volatile at all, if the vapor pressure is very, really tiny.
在室温下,结果是RDX根本不挥发,所以蒸汽压很小。
So even if, on average, the stock is expected to not move at all from where it starts, some stocks will be expected to just trundle along without much change, not very volatile.
所以即使平均而言,股票应该是不会,和开盘的时候有什么区别,有一些股票可能会,没什么变化,不是很反复无常。
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