Every additional index that you define on a table adds to the costs associated with your database.
在一个表上定义的每个额外索引都将增加您的数据库关联成本。
Sometimes, you may find that additional index specifications can also be defined to improve performance.
有时候，您可能发现还可以通过定义附加的索引规范来提高性能。
Additional index definitions that would improve performance of the queries considered by reducing the runtime of the queries.
额外的索引定义，它们通过减少查询的运行时间改进查询性能。
That way, you'll have some reserve index-add capacity, and you'll probably be able to define additional indexes that will look really good from a cost-benefit perspective.
这样，您将拥有一些保留的索引添加容量，并有可能定义一些从成本收益角度来看很不错的额外索引。
The index elements can optionally specify two or more indexes that will be used in the 'IXAND' plan in the specified order and no additional indexes will be added by the optimizer to the IXAND.
INDEX元素可以选择性地指定两个或更多索引，它们将按照指定的顺序应用到“IXAND”计划中，并且优化器不会向IXAND添加更多的索引。
The baseline file contains an index of all of the classes in your project, and maintains additional metadata about each class.
基线文件包含了项目中所有类的一个索引，并维护了关于每一个类的额外元数据。
For arrays, additional methods are also generated to store and retrieve single values in the array; these methods take an array index as an argument.
对于数组而言，也生成了额外的方法来存储并检索数组中的单一值，这些方法将数组索引作为参数。
A functional index incurs the additional cost of function execution.
函数索引还会产生额外的函数执行开销。
Finally, an index on the additional column is created and the table reorganized based on that index.
最后，在附加列上创建一个索引，并根据那个索引对表进行重组。
Of course you'll want to do some additional checking, just to make sure that the index truly isn't needed.
当然，您可能想要做一些附加检查，只是为了确保该索引确实不再需要。
You can easily create an index with your create_table migration, or create an additional migration that creates your index.
可以轻松地使用create _ table迁移创建索引，也可以创建一个额外的迁移来创建索引。
Such statements may benefit from additional tuning to reduce the number of sorts, such as adding an index.
这些语句可受益于减少排序数目的附加调优，例如添加索引。
Gallup's Underemployment Index captures traditional unemployment, as well as those who are employed part-time but seeking additional work.
盖洛普的就业不足指数统计包括了传统意义上的失业人口，还有那些到处找打零工的人口。
Trading of any Standard & Poor's 500 index stock that rises or falls 10 percent or more in a five-minute span must be halted for an additional five minutes.
任何标准普尔500种股票指数在5分钟内上涨或下跌超过10%必须被停止交易5分钟。
Trading of any Standard &Poor's 500 index stock that rises or falls 10 percent or more in a five-minute span must be halted for an additional five minutes.
任何标准普尔500种股票指数在5分钟内上涨或下跌超过10%必须被停止交易5分钟。
There's no point creating additional content if the search engines can't index your existing content.
有没有点创造更多的内容如果搜索引擎不能索引你的现有内容。
The presence of co-existing or additional diseases with reference to an initial diagnosis or with reference to the index condition that is the subject of study.
共病是指相对于原始诊断或相对于研究主题所指病情而言，共同存在或附加的疾病。
Annotate: So called optimizing is WHERE clause used index, cannot optimize happened to express scanning or additional expense namely.
注释：所谓的优化就是WHERE子句利用了索引，不可优化即发生了表扫描或额外开销。
As their applications we have studied the effect of air index gradient on laser alignment and the additional diffraction loss of laser caused by inhomogeneous pump.
应用于空气折射率梯度对激光准直的影响和不均匀泵浦引起的激光器附加衍射损耗。
Based on symmetrical component method and linear superposition principle, the additional positive sequence network after fault is established and the matching index on fault point is defined.
该方法首先运用对称分量法和线性叠加原理建立故障后的附加正序网络并且定义了故障点的匹配指标，进而基于该指标运用遍历搜索方法寻找故障点位置。
Statutory Provision: 18 U. S. C. § 2243(a). For additional statutory provision(s), see Appendix A (Statutory Index).
法律规定：《美国法典》第18编第2243（a）节。其他法律规定，参见附录A（法令索引）。
Also paste the additional HTML codes of your counter, ad-sense into the Preferences area instead of dealing with HTML codes of the index!
还粘贴到，而不是与该指数的HTML代码处理方面的偏好您的柜台，广告意义上的额外HTML代码！
The additional feedback gain is received by the linear quadratic index.
其中，附加反馈增益的确定通过使二次型性能指标最优实现。
Polymerized with suitable methods, additional polymer optical plastics with different functions, especially with high refractive index, can be obtained.
这些单体通过适当的方式聚合后，可得到具有各种功能尤其是高折射率的加聚型聚合物光学塑料。
Outcomes were assessed using Visual Analog Scale (VAS), Oswestry disability index, patient satisfaction, return to military duty, and need for additional surgery.
结果评估利用直观类比标度(VAS)，Oswestry残疾指数，患者满足度，恢复兵役能力以及需要进一步外科治疗等方法。
Statutory Provisions: 18 U. S. C. §§ 876, 877, 1202. For additional statutory provision(s), see Appendix A (Statutory Index).
法律规定：《美国法典》第18编第876、877、202节。其他法律规定，参见附录A（法令索引）。
Additional contributions to the refractive index are expected to come from the dopant(6. 8)as well as from the electro-optic effect.
预料其它对折射率的影响来自掺杂剂以及电光效应。
Additional contributions to the refractive index are expected to come from the dopant(6. 8)as well as from the electro-optic effect.
预料其它对折射率的影响来自掺杂剂以及电光效应。
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