Oracle Database 11 g - Online Public Access Catalog

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476 CHAPTER 11 ■ APPLICATION DEVELOPMENTstructured XMLType is stored as a set of objects. This is also known as object-relational storage andobject-based persistence. The unstructured XMLType is stored in character LOBs datatypes.This is also known as text-based persistence. Oracle Database 11g introduces a new XMLTypedatatype known in the XML industry as Binary XMLType, also recognized as post-parsepersistence.The Binary XMLType introduces advantages to the XML world in the database. BinaryXML format generally reduces the verbosity of XML documents, and thus the cost of parsing isreduced. Even though the XML is stored in a parsed state, data is still accessible via XPath. Noencoding checks are performed on loading. Thus, Binary XML brings forth no overhead (or atleast reduced overhead) in parsing, validation, or conversions, which saves in time in IO andCPU cycles, which therefore translates into faster load times. Binary XML is capable of preservinginfoset and DOM fidelity. If the XML data is going to be retrieved, Binary XML is the new solutionfor Oracle Database 11g.Binary XML is the closest thing to a universal storage model for XML data by providing thestorage benefits of both structured and unstructured data. Like structured storage, you canperform piecewise updates on Binary XML. Similar to unstructured storage, Binary XML datais kept in document order. Similarly, like structured XML, data and metadata can be separatedat the database level. Another great benefit of Binary XML is that you can leverage binary storage forXML schema-based data even if the XML schema is not defined in completeness. Furthermore,with Binary XML, you can store XML schemas in the same table and query across commonelements.There are numerous advantages to Binary XML storage. First is high throughput including fastDOM loading. Though Binary XML storage takes up more space than object-relational storage, itdoes considerably better than CLOB storage. Binary XML storage provides the most schemaflexibility of the three storage models. You have the option to store data and metadata togetheror separately. You can even use multiple schemas for the same XMLType table. Binary XMLsupports SQL scalar datatypes and SQL constraints. Binary XML supports indexing withXMLIndex, function-based indexes, and Oracle Text indexes. The performance of XPath-basedqueries produce good results. Streaming XPath evaluation circumvents DOM construction andevaluates multiple XPath expressions in a single pass. Using XMLIndex, you can improve theperformance of XPath-based queries. XMLIndex will be discussed in detail in subsequentsections. Lastly, for XML schema–based data, inserted rows are fully validated during DMLactivity.Let’s look into how to create and manage this new XML datatype. First, let’s create an XMLtable of Binary XML:SQL> create table edba_xml2 of sys.xmltype xmltype3 store as securefile4 binary xml ( tablespace users5 retention auto keep_duplicates6* compress high ) tablespace usersSQL> /Table created.
CHAPTER 11 ■ APPLICATION DEVELOPMENT 477You’ll notice in this example that the XMLTYPE STORE AS SECUREFILE BINARY XML syntaxdistinguishes this XMLType as Binary XML. You will also notice that the SECUREFILE with KEEP_DUPLICATES clause is utilized. For complete detailed information on the SECUREFILE option,please refer to Chapter 12.Oracle Enterprise Manager Database Console provides full support for XML including thenew Binary XMLType table. By utilizing the EM Database Console, you can easily implementBinary XML. One thing to note with Oracle Database 11g Enterprise Manager Database Console isthat the location of the XML database management menus are located somewhere else. TheXML database management options are located on the Schema tab on the middle left of thescreen (see Figure 11-1).Figure 11-1. Enterprise Manager Database Console XML database management menu optionsNow, let’s create your first Binary XMLType table using Enterprise Manager Database Consoleby clicking the XMLType Tables link; just select Schema ➤ XML Database ➤ XML Type Tables.The easiest way to create an XMLType table is to base it on another XMLType table, asdepicted in Figure 11-2.
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The EXPERT’s VOIce ® IN ORACLEAl
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Contents at a GlanceAbout the Autho
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■CONTENTSixSQL*Plus New Features
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■CONTENTSxiEnterprise Manager Int
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■CONTENTSxiiiCombined Capture and
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About the Authors■SAM ALAPATI is
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xxii■ACKNOWLEDGMENTSNothing I do
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xxiv■INTRODUCTIONPerformance Mana
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100 CHAPTER 3 ■ DATABASE ADMINIST
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226 CHAPTER 5 ■ DATABASE SECURITY
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266 CHAPTER 6 ■ BACKUP AND RECOVE
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CHAPTER 7■ ■ ■Data PumpDBAs a
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CHAPTER 7 ■ DATA PUMP 315if test
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CHAPTER 7 ■ DATA PUMP 319Encrypti
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CHAPTER 7 ■ DATA PUMP 325SELECT d
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CHAPTER 9■ ■ ■Storage Managem
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416 CHAPTER 10 ■ DATA GUARD• Lo
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