Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Extensible Storage Engine wikipedia , lookup
Open Database Connectivity wikipedia , lookup
Microsoft Jet Database Engine wikipedia , lookup
Encyclopedia of World Problems and Human Potential wikipedia , lookup
Oracle Database wikipedia , lookup
Concurrency control wikipedia , lookup
Entity–attribute–value model wikipedia , lookup
Versant Object Database wikipedia , lookup
Relational model wikipedia , lookup
XML Data Storage Joe Carroll Russell Gibbons Agenda What is XML Storage of XML Benefits of XML Databases Problems with XML Databases Discussion What is XML “XML (Extensible Markup Language) is a W3C initiative that allows information and services to be encoded with meaningful structure and semantics that computers and humans can understand. XML is great for information exchange, and can easily be extended to include user-specified and industry-specified tags.” www.orafaq.com/glossary/faqglosx.htm Storage of XML Character Relational (shredded) Native XML Character Storage options Large character fields in DBMS Flat files .xml files Fast insert & retrieval Poor search Relational Data still stored as character Portions of the data extracted into additional relational tables Increased parse time Increased search capabilities Native XML Exclusive XML DBMS Sedna Timber Integrated XML DBMS DB2 Oracle Native XML Benefits XML messages stored in their original format Documents can be transformed straight from the database via XPath or XSLT. Increased search capabilities for documents that must be stored as XML. Native XML Problems Same problems as hierarchical databases Many-to-many relationships Referential Integrity Difficult to handle within legacy applications. Increased CPU consumption. Discussion References [1] Shalaka Natu, John Mendonca, “Digital Asset Management Using A Native XML Database Implementation”, CITC4 ’03, October 16-18, 2003, Lafayette, Indiana, USA. [2] Matthias Nicola, Jasmi John, “XML Parsing: A Threat to Database Performance”, CIKM ’03, November 3-8, 2003, New Orleans, Louisiana, USA. [3] Mattias Nicola, Bert van der Linden, “Native XML Support in DB2 Universal Database”, Proceedings of the 31st VLDB Conference, Trondheim, Norway, 2005. [4] “Native XML data store overview”, http://publib.boulder.ibm.com/infocenter/db2luw/v9/topic/com.ibm.db 2.udb.apdv.embed.doc/doc/c0022308.htm [5] “Use XML databases to empower Java Web services”, http://www.javaworld.com/javaworld/jw-12-2004/jw-1206-xml.html