Getting Started with DB2 Express-C

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266 Getting Started with DB2 Express-C you had a database consisting of the tables Employee and Department. Typically with a non-XML database, if your manager asked you to store not only one phone number per employee (the home phone number), but also a second phone number (a cell phone number), then you could add an extra column to the Employee table and store the cell phone number in that new column. However, this method would be against the normalization rules of relational databases. If you want to preserve these rules, you should instead create a new Phone side table, and move all phone information to this table. You could then also add the cell phone numbers as well. Creating a new Phone table is costly, not only because large amounts of preexisting data needs to be moved, but also because all the SQL in your applications would have to change to point to the new table. Instead, on the left side of the figure, we show how this could be done using XML. If employee Christine also has a cell phone number, a new tag can be added to put this information. If employee Michael does not have a cell phone number, we just leave it as is. Figure 15.6 – Increased data flexibility using XML 4. You can improve your XML application performance. Tests performed using pureXML technology showed huge improvements in performance for XML applications. Table 15.1 shows the test results for a company that switched to pureXML from older technologies. The second column shows the results using the old method of working with XML using another relational database, and the third column shows the results using DB2 with pureXML. Task Other relational DB DB2 with pureXML Development of search and CLOB: 8 hrs 30 min.
Chapter 15 - DB2 pureXML 267 retrieval business processes Shred: 2 hrs Relative lines of I/O code 100 35 (65% reduction) Add field to schema 1 week 5 min. Queries 24 - 36 hrs 20 sec - 10 min Table 15.1 – Increased performance using pureXML technology 15.3.2 XPath basics XPath is a language that can be used to query XML documents. Listing 15.1 shows an XML document, and Figure 15.7 illustrates the same document represented in parsedhierarchical (also called “node” or “leaf”) format. We will use the parsed-hierarchical format to explain how XPath works. John Doe 408 555 1212 344 Peter Pan 408 555 9918 216 Listing 15.1 – An XML document dept employee employee id=901 name phone office id=902 name phone office John Doe 408-555-1212 344 Peter Pan 408-555-9918 216 Figure 15.7 – Parsed-hierarchical representation of the XML document in Listing 15.1
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GETTING STARTED WITH DB2 Express-C
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Contents About this book ..........
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Contents 7 6.3 DB2 storage model ..
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Contents 9 13.4.2 Cursor stability
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About this book Notices and tradema
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About this Book 13 A book for the c
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About this Book 15 Foreword Innovat
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1 Chapter 1 - What is DB2 Express-C
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Chapter 1 - What is DB2 Express-C?
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1.8 Moving up to another DB2 editio
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4 Chapter 4 - DB2 Environment The D
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Chapter 4 - DB2 Environment 69 conf
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Chapter 4 - DB2 Environment 73 Tabl
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6 Chapter 6 - DB2 Architecture In t
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8 Chapter 8 - Working with Database
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9 Chapter 9 - Data Movement Utiliti
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Chapter 9 - Data Movement Utilities
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11 Chapter 11 - Backup and Recovery
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11.4 Database logging from the Cont
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Getting Started with DB2 Express-C

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