Lesson Review in .NET framework

Paint PDF417 in .NET framework Lesson Review

Lesson Review
PDF 417 Drawer In .NET
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PDF-417 2d Barcode Decoder In VS .NET
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The following questions are intended to reinforce key information presented in this lesson. The questions are also available on the companion CD if you prefer to review them in electronic form.
Barcode Generation In Visual Studio .NET
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Scanning Bar Code In VS .NET
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Lesson 5: Converting Between XML Data and Relational Data
Making PDF417 In C#
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Print PDF 417 In VS .NET
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NOTE
PDF-417 2d Barcode Creator In VB.NET
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Drawing UPC-A Supplement 5 In VS .NET
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Answers
Paint Bar Code In VS .NET
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GS1 DataBar Truncated Encoder In Visual Studio .NET
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Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of this book.
Drawing Data Matrix In .NET Framework
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Printing ANSI/AIM I-2/5 In Visual Studio .NET
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1. An application you wrote uses OPENXML to parse XML data into a relational table. As soon as the XML data got bigger, you started to see that SQL Server was running out of memory, and your OPENXML query started to return memory errors. What can you do to improve performance (Choose all that apply.) A. When possible, process all XML documents at once instead of splitting the documents into multiple smaller files. B. Check that you are calling sp_xml_removedocument as soon as possible after executing OPENXML. C. Reduce the size of the XML files by making the XML tag names smaller. D. When possible, split the XML data into multiple smaller files and process each of them independently. 2. Under which circumstances should you use the nodes() method instead of OPENXML (Choose all that apply.) A. The XML data is already stored in an XML data type column. B. You need to extract XML data out of multiple columns, not just a single source. C. You need to use an XPATH expression not supported by OPENXML but supported by the XML data type implementation. D. You are migrating stored procedure code from a previous version of SQL Server.
QR-Code Recognizer In VB.NET
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Make GTIN - 128 In None
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8
GS1 - 12 Encoder In None
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PDF417 Generation In VB.NET
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Managing XML Data
Print PDF417 In None
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Encode Bar Code In None
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Lesson 6: Creating XML Indexes
Paint QR-Code In None
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Making QR Code JIS X 0510 In VS .NET
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Lessons 2 and 3 examined different alternatives for retrieving XML data out of SQL Server 2005. Depending on the size of this data, extraction can be a costly operation. By implementing different indexing options on the XML data type, you can have SQL Server 2005 resolve queries on XML data types by inspecting only a certain set of nodes and not navigating through the complete XML document or fragment. In this lesson, you see the benefits of indexing XML data as well as the best indexes to use for different scenarios.
After this lesson, you will be able to:
Describe the benefits of creating a primary XML index. Define a strategy to create secondary indexes. Choose the appropriate secondary index based on the queries to be executed. Create XML indexes.
Estimated lesson time: 30 minutes
Indexing an XML Data Type Instance
The XML data type in SQL Server 2005 can store a maximum of 2-GB of information. When XML data is assigned to an XML data type instance, it is transformed into an internal binary large object (BLOB) representation. When you use XML data type methods to query the XML data, SQL Server performs a lookup on the table data rows to extract the required nodes. You can gain a performance improvement when you index the XML internal structure. Instead of having to look up the queried data in the 2 GB binary representation of all the XML data, the SQL Server query processor can perform an index lookup and probe fewer memory pages to serve the query. You can create two general types of indexes on the XML data type: a primary index and a secondary index (of which there are three types). Indexes improve performance when reading data because fewer data pages must be read into memory to return the desired result. On the other hand, performance can be affected under a heavy load of insert, update, and delete operations because of SQL Server having to update the index structures in addition to the table itself.
Lesson 6: Creating XML Indexes
Creating an XML Data Type Primary Index
XML data type instances can have only one primary index. The primary index analyzes the complete XML structure, so the number of rows in the index is approximately equal to the number of nodes in the XML BLOB. The primary index in an XML data type instance maintains the information that Table 8-8 describes.
Table 8-8
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