第一种方法的优点在于始终保持精确，始终能准确的定位在哪里有您想要的哪些内容。
The first approach has the advantage of always being accurate, and always searching exactly where, and for exactly what, you indicate.
通过钱德拉软件，我们应该可以做出更精确的测量，我们需要给这些物体更加准确地定位，并归纳其属性。
With Chandra we should be able to make the accurate measurements we need to pinpoint them more precisely and identify their nature.
优化器凭借精确的基数估计值来准确计算出每一个待定查询访问计划的成本。
The optimizer is dependent on accurate cardinality estimates to properly compute the cost of each query access plan considered.
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