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To further practice and reinforce the skills you learned in this chapter, you can
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Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenarios. These scenarios set up real-world situations involving the topics of this chapter and ask you to create a solution. Complete the suggested practices. Take a practice test.
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SQL Server 2005 takes the XML feature set provided by SQL Server 2000 and adds the capability to manipulate XML in and out of the database server, to compose relational data into XML data, and to shred XML data into relational data. The biggest benefit of SQL Server 2005 s XML capabilities is that you can represent data in whichever format is best for that specific data whether it is structured data, semi-structured data, or unstructured data and still use the same query engine to return query results. The new XML data type is central in SQL Server 2005 s XML infrastructure, giving you methods for manipulating XML data and structure through XQUERY and XPATH query expressions. SQLXML, a middle-tier COM component, enables you to compose relational data into XML data by using annotated XSD schemas and XML views, which give you an easy way to manage the XML result from multiple Transact-SQL and XPATH queries in just one file. You can create indexes on the XML data type column to help the SQL Server query engine optimize the query execution plan. The XML data type column accepts one primary index and three types of secondary indexes.
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Key Terms
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Do you know what these key terms mean You can check your answers by looking up the terms in the glossary at the end of the book.
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composition Document Object Model (DOM)
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Edge Table FLWOR expression parse semistructured data shredding Simple API for XML (SAX) structured data typed XML data unstructured data untyped XML data updategram XML validation XPATH XPATH axes XPATH predicates XQUERY
Case Scenarios
In the following case scenarios, you will apply what you ve learned in this chapter. You can find answers to these questions in the Answers section at the end of this book.
Case Scenario 1: Troubleshooting XML Performance by Choosing the Correct Indexing Strategy
You are a database developer for one of the biggest news syndication agencies in the country. Your application subscribes to RSS feeds from diverse sources spread around the world. Your customers subscribe to your syndication service by providing specific keywords that they are interested in being notified about when they occur in any feed from any source. Your application scans nearly 2,000 sources every 5 minutes for new feeds. The results of such scanning are saved in XML format in a SQL Server 2005 database, in which a second process probes for the keywords defined by customers. The second process uses the XQUERY language through the query() method in the XML data type.
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You wrote the following function to probe for the keywords:
CREATE FUNCTION fn_FindKeyword(@keyword AS nvarchar(100)) RETURNS @xml TABLE ( result XML ) AS BEGIN INSERT INTO @xml SELECT FEED.query(' for $item in /rss/channel/item, $title in $item/title, $desc in $item/desc return <result> { if (fn:contains(string($title), sql:variable("@keyword")) or fn:contains(string($desc), sql:variable("@keyword"))) then <found/> else <notfound/> } </result> ') FROM RSS RETURN END GO
The fn_FindKeyword function is called by the following code:
SELECT * FROM Customer_Keywords CK CROSS APPLY dbo.fn_FindKeyword (CK.keywords)
To enhance query performance, you created an XML VALUE index on the FEED column. 1. Will this index provide the best performance 2. Which other XML index could you use to improve performance 3. Are there any other search alternatives that would meet the requirements for this specific case scenario
Case Scenario 2: Handling Data as XML or as Relational Representation
You are working as a database developer for a global company with offices in more than 150 countries. The Human Resources (HR) department must evaluate every employee at the end of the fiscal year. To do so, the HR department asks you to develop an Employee Evaluation questionnaire application.
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