比这更糟糕的是，这样的系统很多都没有经过优化，容易受到部分或全面故障和外部攻击的威胁。
Worse than this, many such systems are not optimized and are vulnerable to the threats of partial or complete failure and external attacks.
在这个场景中，经过分析，可以确定使用索引i 11来访问表tab 1是最优的，但是优化器的默认行为不会这么做，即使在调优之后也仍然不会这样做。
In this scenario, after analysis, it was determined that it will be optimum to use the index I11 to access the table TAB1, but the default behaviour of the optimizer did not, even after tuning.
优化内容是我刚刚谈到的经过缩减的内容。
The Optimized content is the shortened content that I just talked about.
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