• 这个例子中,我们将针对数字图像像素平均创建函数索引

    In this example, we create functional indexes on the average color values of the pixels in a digital image.

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  • 函数索引不能内置代数指数、对数十六进制函数

    A functional index cannot be a built-in algebraic, exponential, log, or hex function.

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  • 我们需要指定应该使用哪个函数根据给定输入生成索引条目

    We need to specify which function should be used to generate the index entries from the given input value.

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  • 这个例子演示了如何使用函数索引选择具有某些特征图像

    This example demonstrates how functional indexes can be used to select images with certain characteristics.

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  • 函数索引还会产生额外函数执行开销

    A functional index incurs the additional cost of function execution.

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  • 查询计划展示了函数索引使用

    This query plan shows the use of a functional index.

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  • 函数索引可以根据用户定义类型创建

    A functional index can be created on user defined types.

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  • 本文提供了一些有关函数索引示例

    This article provides several samples of functional indexes.

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  • 已经了解了函数索引定义以及使用方式使用时机。

    You have now learned the definition of a functional index and have seen how and when to use them.

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  • 说明创建删除函数索引时,执行索引始终持有一个排他

    This means that an exclusive lock is always placed on the indexed table while a functional index is being created or dropped.

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  • 用于INSERTUPDATE操作构造索引的键生成器函数

    Key generator function to construct index key during INSERT and UPDATE operations.

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  • 示例展示如何面积创建函数索引

    This example shows how to create a functional index on the area of a circle.

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  • 函数索引中的数据进行转换按照顺序保存转换后的

    A functional index transforms the data in a column and stores the derived values in sorted order.

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  • 函数索引存储维护成本较高

    The cost for storage and maintenance of a functional index can be high.

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  • 不能针对返回对象UDR创建函数索引

    A functional index cannot be created on a UDR that returns a large object.

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  • 使用第一方法可以通过syscall函数调用索引标识的函数

    With the first method, you call your new functions as identified by their index through the syscall function.

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  • XPath例子中,last函数返回最后匹配元素索引(在方括号中)。

    In the XPath example, the last function returns the index of the last matched element, which you use in square brackets.

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  • 中,我们将向展示如何创建使用r - Tree访问方法函数索引

    In this example we show you how to create a functional index that USES the R-Tree access method.

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  • 具体来说我们使用名为tokenextraction索引函数附带行为

    Specifically, we'll use a collateral behavior of the main indexing function called token extraction.

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  • 创建函数索引注意事项。

    Considerations before creating a functional index.

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  • 示例使用r - Tree访问方法函数索引

    Example: Functional index using R-Tree access method.

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  • 可以document()函数创建涉及多个文件索引目录

    You can use the document() function to create indices or tables of content that span multiple files.

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  • 下面列出了r - Tree函数索引一些有趣特性。

    Some interesting facts about functional R-Tree indexes are.

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  • 这个方法使用当前状态事件类型作为关联数组索引actionTransitionFunctions选择调用函数

    The method does select a function to call from the actionTransitionFunctions table using the current state and event type as associative array indexes.

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  • 不过虽然认为预定索引,但这个简单函数没有费心去实现

    However, even though I recognize the coolness of predictive indexing, my simple function does not bother implementing it.

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  • 函数索引一种强大的性能调优工具

    Functional indexes can be a powerful performance tuning tool.

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  • 这个文本搜索相关函数被称为文本搜它是专门设计用来执行文本数据的快速检索和自动索引

    This text search package and its associated functions, referred to as the text search engine, is specifically designed to perform fast retrieval and automatic indexing of text data.

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  • 注意索引表达式用于关系表达式,作为某个操作符函数参数时,查询优化器将考虑使用函数索引

    Note: the query optimizer considers using a functional index when the index expression is used in a relational expression or as an argument to one of the operator class functions.

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  • 7显示查询响应时间作为文档(范围1,000100,000)函数(使用索引索引)。

    Figure 7 shows the query response times as a function of the number of documents in the table, ranging from 1,000 to 100,000 documents (when no indexes or side tables are used).

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  • 此外还将了解如何创建使用函数索引以及创建函数索引之前需要考虑一些问题

    In addition, you will learn how to create and use functional indexes and be given a list of things to consider before creating functional indexes.

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