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First of all, the subject of XML namespaces exceeds the scope of this chapter. But what you should know about XML namespaces in order to understand their role in these examples is that they represent the business domain in which a particular XML entity exists. In our examples, we ve introduced three XML namespaces: one for Album data, another for Band data, and a third to represent a shared domain used both by the Album and the Band domains. Think about it: does an Album represent the same business entity as a Band No, absolutely not! Therefore, if we ve decided on using XML to represent each of them, we need a way to distinguish between them, and this is where XML namespaces come in. An XML entity that exists in the Album namespace can t be mistaken for an XML entity that exists in the Band namespace, although they re both represented as XML. In plain English: an Album can t be a Band and a Band can t be an Album. Microsoft SQL Server 2005 and later versions support XML namespaces and introduces two methods used to declare them using T-SQL. Throughout this chapter we ll be using the WITH XMLNAMESPACES clause to declare XML namespaces that will be used in XPath expressions. All the details regarding XML namespaces in SQL Server and the WITH XMLNAMESPACES clause can be found in Books Online. General information regarding XML namespaces can also be found online: http:// www.w3.org/TR/xml-names/.

This method supports migration from any Oracle database version on any platform It requires downtime, which for the most part depends on the time it takes to move the data through the network CTAS and IAS methods are single threaded and are not automatically parallelized since the database link is inherently serial when used in a statement However, you can manually parallelize the migration process by initiating multiple CTAS or IAS statements But keep in mind that the overall throughput is limited by the available network bandwidth between the source and the destination This method enables migration of subsets of data, including subsets of schemas and even portions of tables or partitions by using the QUERY clause Consider routing the database links over the InfiniBand or the 10 Gigabit Ethernet network to improve the data transfer rate

(c) 85 , as calculated using trigonometry (d) 65 , as calculated using trigonometry 19 Consider an RL circuit that consists of a 100- H inductor and a 100- resistor What is the phase angle at a frequency of 200 kHz (a) 450 (b) 515 (c) 385 (d) There isn t enough data given to calculate it 20 Suppose an RL circuit has an inductance of 88 mH, and the resistance is 95 At 800 Hz, what is the phase angle (a) 78 (b) 12 (c) 43 (d) 47

Using the XPath expressions listed in tables 3 and 4, we can prepare individual T-SQL SELECT statements used to extract the data from the XML source. In these SELECT statements, we ll use the XML retrieval methods mentioned earlier, and in the final definition of the query, we ll include them in INSERT statements that will be used to import the data extracted from the XML source into the corresponding tables of our Discography database. Note that in the INSERT statements, we ll also have to prevent certain constraint violations most of all, we ll need to prevent the import of data that already exists in the database.

Summary

The source of the Album data is an XML entity based on the Album XML Schema shown in listing 1 earlier in this chapter. This XML Schema provides the structure to hold the data for the Title, Album, and Person entities, including data for the Track Author and Track Performer associative entities. All the details regarding XPath functions implemented in SQL Server are available in the Books Online article titled XQuery Functions against the xml Data Type.

reactance, can be represented as a ray The capacitive-reactance ray goes in a negative direction and is assigned negative ohmic values When the capacitive-reactance and inductive-reactance rays are joined at their endpoints (both of which correspond to a reactance of zero), a complete number line is the result, as shown in Fig 14-1 This line depicts all possible values of reactance

In the following examples, @xml designates a variable of the XML type holding the XML data in question. First off, listing 4 shows the code to extract the titles.

In this chapter, you have learned about the different migration methodologies for migrating databases to the Exadata Database Machine These methodologies have been proven to be successful in real-world migrations that have complex requirements In order for you to navigate a large migration project, the details listed in this chapter will help you plan the outcome that will be successful, the most cost effective, and the one that applies best in your environment

xmlnamespaces ( 'http://www.w3.org/2001/XMLSchema-instance' as xsi ,'http://schemas.milambda.net/Music' as m ,'http://schemas.milambda.net/Music-Album' as ma ) Discography.Album.query (' data(@ma:title) ').value ( '.' ,'nvarchar(450)' ) as Title from @xml.nodes (' /ma:discography/ma:album ') Discography (Album) Discography.Track.query (' data(@ma:title) ').value ( '.' ,'nvarchar(450)' ) from @xml.nodes (' /ma:discography/ma:album/ma:track ') Discography (Track)

Try breaking the long set target statement near the end of the script onto two lines Position the insertion point at a handy place, such as after the front Finder window, and then press OPTION-RETURN AppleScript Editor inserts the continuation character and breaks the line, indenting it to the same level: