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Assume that you wish to improve the response time when executing the following [XQuery] on a certain XMLDB. Which one of the answers below is not an appropriate point to be checked? Assume that the XMLDB does not have any automated optimization functions related to the answer choices.
Assume that for [XML Document] referenced in a separate window, you wish to create an XML Schema document that defines that the value of the level element must be unique within the XML document. Which of the following correctly describes the XML Schema document?
[XML Document]
100
250
Consider the structure of XML when storing date information as XML data. You must aggregate data for each calendar year from this XML data. Assume that statistical values related to the storage and retrieval of date information in a certain XMLDB is as follows:
[Date Information XML Structure A]
[Date Information XML Structure B]
[Statistical Values] (assumed)
The search for one date node (XML structure A) or one y node (XML structure B) takes one microsecond in either case, regardless of search path.
With respect to structure A, two microseconds are required for each date node to determine whether the date element value matches the search year.
With respect to structure B, one microsecond is required for each y node to determine whether they element value is the same as the search year value.
The number of date elements at the initial state is 2000.
The number of date elements will increase with future updates; however, this is not a consideration for this question.
Insertion of a new date element under structure A takes 10 microseconds.
Insertion of a new date element under structure B takes 20 microseconds.
Do not consider any facts or conditions other than those noted above.
When the average number of new date element insertions per month is 20, and the average number of calendar date information searches per month is 10, which is the most effective XML structure in improving overall execution efficiency for insertions and searches?
See separate window.
Assume you wish to execute a query on [example xml] (separate window) to obtain a record element that includes a data element for which the condition attribute value is "good," and for which the element value is 100 or less. Select the correct result of executing the [XQuery] (separate window). The expected result would be "C;" however, the query may not be processed as expected.
See separate window.
A certain Web application displays user information according to user input via Web browser. The XML data managing user information is as shown in [example.xml] (separate window). The following [XQuery] is executed when the Web application retrieves user information from [example xml].
[XQuery]
fn:doc("example.xml")//data[userid = "(1)"][password = "(2)"]
}
At this time, the Web application completes the [XQuery] by replacing (1) and (2) with the user input character string, and executes the query.
No character escapes (e.g. convert "<" to "<") are performed for character string input by the user. Select two of the following that produces the query execution result in [Execution Result] (separate window) when the character string is as shown in each answer choice.
