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PRODID:Data::ICal 0.24
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TZID:Pacific/Auckland
X-LIC-LOCATION:Pacific/Auckland
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DTSTART:19700927T020000
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TZOFFSETFROM:+1200
TZOFFSETTO:+1300
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DTSTART:19700405T030000
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BEGIN:VEVENT
CATEGORIES:SMS Seminars
CONTACT:Hui Ma
DESCRIPTION:The Extensible Markup Language (XML) has attracted much attenti
 on as a data model for data exchange\, data integration and rich data repr
 esentation. A challenging question is how to manage native XML  \ndata in 
 distributed databases. This leads to the problem of how to obtain a suitab
 le distribution design for XML documents.  \n\nFragmentation\, replication
  and allocation are database distribution design techniques that aim at im
 proving the system performance.  \n\nFragmentation can either be horizonta
 l or vertical. Among the two fragmentation techniques\, vertical fragmenta
 tion is often considered  \nmore complicated than horizontal fragmentation
  because of the huge number of alternatives. Vertical fragmentation has be
 en studied in  \nthe relational data model and the object oriented data mo
 del.  Existing vertical fragmentation approaches are mainly affinity-based
 .  \n\nIn this seminar\, I will first show that affinity-based vertical fr
 agmentation approach cannot be adapted to XML because of their  \ndeficien
 cies. Then I will present a design approach for vertical fragmentation whi
 ch is based on a cost model that takes the complex structure of queries on
  XML data into account. It will be shown that system performance can be im
 proved after vertical fragmentation using our approach\, which is based on
  user access patterns.
DTEND;TZID=Pacific/Auckland:20080214T133000
DTSTAMP:20260404T184720Z
DTSTART;TZID=Pacific/Auckland:20080214T123000
LOCATION:Cotton Club\, Cotton 350
ORGANIZER:Hui Ma
SUMMARY:Hui Ma - Cost-Based Vertical Fragmentation for XML
UID:seminar_sms540_20090312131426
URL:
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