XML Data Storage Joe Carroll Russell Gibbons. Agenda What is XML Storage of XML Benefits of XML Databases Problems with XML Databases Discussion.

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Presentation transcript:

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.” “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.”

Storage of XML Character Relational (shredded) Native XML

Character Storage options Large character fields in DBMS Large character fields in DBMS Flat files Flat files.xml 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 Sedna Timber Timber Integrated XML DBMS DB2 DB2 Oracle 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 Many-to-many relationships Referential Integrity 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, [4] “Native XML data store overview”, 2.udb.apdv.embed.doc/doc/c htm 2.udb.apdv.embed.doc/doc/c htm 2.udb.apdv.embed.doc/doc/c htm [5] “Use XML databases to empower Java Web services”,