Once decomposed, the resulting bits can be optimized to ensure that minimum inputs produce maximum outputs.
被分解之后，散装的成果可以优化以达成最低输入和最大产出。
Once done, the index can be optionally optimized before it is closed and the changed committed.
一旦完成这些步骤，索引就可以在关闭前得到优化，同时所做的改变也会生效。
The main difference is that, unlike the statement class, prepared statement is complied and optimized once and can be used multiple times by setting different parameter values.
预置语句与statement类的主要区别在于，前者可以只编译和优化一次，然后通过设置不同的参数值多次使用。
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