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SUMMARY:IC Monday Seminar - Curbing Time Intervals in Database Systems
DTSTART:20110207T161500
DTSTAMP:20260414T215236Z
UID:b61e72e983118f61cfa0695187f200b77bd388e656d336ddc4710a1d
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Michael Boehlen of the University of Zurich invited by P
 rof. Christoph Koch\nAbstract:\nA wide range of databases store time-varyi
 ng data\, and in relational databases the most common choice is to associa
 te each tuple with a time interval.  Processing tuples that are timestampe
 d with intervals\, however\, turns out to be complex with many subtle issu
 es.  We present the requirements towards a database systems that wants to 
 provide principled support for time intervals and then introduce unificati
 on as a new basic operator of a relational algebra.  Unification provides 
 systematic support for managing time intervals and has been integrated int
 o the kernel of PostgreSQL to offer native database support for processing
  time-varying data.  In the second part of the talk we look at database ap
 plications and describe how to comprehensively offer support for time-vary
 ing information in SQL through statement modifiers\, which apply to all qu
 ery language statements\, e.g.\, queries\, integrity constraints\, asserti
 ons\, views\, and data manipulation statements.  We conclude the talk by d
 escribing the solutions that commercial database systems are currently imp
 lementing to support time-varying data.\n\nBio:\nMichael H. Böhlen receiv
 ed his M.Sc. and Ph.D.  degrees from ETH Zürich in respectively 1990 and 
 1994.  He is a professor in the Department of Computer Science at the Univ
 ersity of Zürich where he heads the database technology group.  Before jo
 ining the University of Zürich he was a faculty member at Aalborg Univers
 ity and the Free University of Bolzano.\nHis research interests include va
 rious aspects of data management\, and have focused on time-varying inform
 ation\, data warehousing and analysis\, and similarity search in hierarchi
 cal data.  With his colleagues\, he regularly publishes in the main databa
 se outlets.  He served as a PC member for many international conferences (
 including SIGMOD\, VLDB\, ICDE and EDBT).  Currently\, he serves as an ass
 ociate editor for the VLDB Journal and ACM TODS\, and he is a member of th
 e VLDB Endowment's Board of Trustees.  He is a member of ACM and IEEE.
LOCATION:INM 202
STATUS:CONFIRMED
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