Lesson 6 in .NET framework

Creator PDF 417 in .NET framework Lesson 6

Lesson 6
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1. Correct Answer: C A. Incorrect: A PATH secondary index will not help much in this type of query because the expression is not searching for a specific path, and the path is not even fully specified.
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8: Case Scenario Answers
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B. Incorrect: A PROPERTY secondary index will not help much in this type of query because the expression is not filtering on the table s primary key and extracting values by using the value() method. C. Correct: A VALUE secondary index will improve the query performance because the query engine will execute a lookup on the secondary index and serve the query without having to access the XML BLOB. D. Incorrect: SQL Server 2005 does not support creating a clustered index on an XML-typed column. 2. Correct Answer: D A. Incorrect: Creating new indexes will not help because the application is inserting more information than it is reading. B. Incorrect: Dropping the secondary indexes would bring a slight improvement in performance, but it is not the best answer. C. Incorrect: Creating new indexes would not help because the application is inserting more information than it is reading. D. Correct: Dropping all the indexes on the XML columns would improve performance because SQL Server would not have to maintain them. You could re-create them later, after the heavy insert activity is finished.
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8: Case Scenario Answers
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Case Scenario 1: Troubleshooting XML Performance by Choosing the Correct Indexing Strategy
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1. You should use an XML VALUE index if your queries are value-based, meaning that you will filter by the contents of the nodes first and maybe not by the structure of the XML data. Also, you should use an XML VALUE index when the path is not fully specified or if it includes a wildcard. When such conditions exist, an XML VALUE index is optimal because the key columns of the VALUE index are the node value and path of the primary XML index. In our case scenario, even though we are interested in searching on the values (we must search for feeds that contain specific keywords) and not in the structure, the XQUERY written in the fn_FindKeyword function filters first by the node structure and then by the values. Therefore, the VALUE index doesn t provide the best performance.
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9: Lesson Review Answers
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2. The for $item in /rss/channel/item, $title in $item/title, $desc in $item/desc declaration in the FLWOR expression will filter first by path to find those nodes that must be processed. In this case, an XML PATH index would be much more valuable because the key columns are the path and then the node value. 3. Another possible alternative in this specific scenario is to use the SQL Server 2005 Full Text Search service to query the text provided inside the XML feeds.
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Case Scenario 2: Handling Data as XML or as Relational Representation
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Among the many reasons you could give your manager for your recommended solution, here are some important benefits your company could gain from using XML Web services for this application:
The type of information you must store requires order preservation. The order in which questions are formulated depends on previous answers. Preserving order is an XML strength. The different schemes for answer types would be hard to represent in a relational structure. XML easily handles semistructured data, in which some structure in the data is constant, and others might be optional or dependent on other parts of the structure. Because this questionnaire must be given in more than 150 countries, it likely will be easier and more scalable and maintainable to distribute the questions as XML Web services. And if the data will be consumed in XML format, why spend the time and effort to transform it into a different format just for storage Management will want to run different types of reports against this data (for example, which employees are performing above expectations, which are having morale problems, and so on). And you can use XQUERY to create complex queries that span different answer choices and answer formats.
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