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Anzahl der Einträge: 49.

Helmer, Sven ; Aly, Robin ; Neumann, Thomas ; Moerkotte, Guido Indexing Set-Valued Attributes with a Multi-Level Extendible Hashing Scheme. Wagner, Roland Lecture Notes in Computer Science 4653 98-108 In: Database and expert systems applications : 18th International Conference, DEXA 2007, Regensburg, Germany, September 3 - 7, 2007; proceedings (2007) Berlin [u.a.] [Konferenzveröffentlichung]

Brantner, Matthias ; Helmer, Sven ; Kanne, Carl-Christian ; Moerkotte, Guido (2006) Kappa-Join: Efficient Execution of Existential Quantification in XML Query Languages. Open Access None [Arbeitspapier]
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Brantner, Matthias ; Kanne, Carl-Christian ; Moerkotte, Guido ; Helmer, Sven Algebraic Optimization of Nested XPath Expressions. Barga, Roger S. 22nd International Conference on Data Engineering, ICDE 2006, 3-8 April 2006, Atlanta, GA, USA; proceedings 128 In: 22nd International Conference on Data Engineering workshops : 3 - 7 April 2006, Atlanta, Georgia ; proceedings (2006) Los Alamitos, Calif. [Konferenzveröffentlichung]

Brantner, Matthias ; Helmer, Sven ; Kanne, Carl-Christian ; Moerkotte, Guido Kappa-Join: Efficient Execution of Existential Quantification in XML Query Languages. Amer-Yahia, Sihem Lecture Notes in Computer Science 4156 1-15 In: Database and XML technologies : 4th International XML Database Symposium, XSym 2006, Seoul, Korea, September 10 - 11, 2006; proceedings (2006) Berlin [u.a.] XSym 2006 (Seoul, Korea) [Konferenzveröffentlichung]

Neumann, Thomas ; Helmer, Sven ; Moerkotte, Guido On the Optimal Ordering of Maps, Selections, and Joins Under Factorization. Bell, David A. Lecture Notes in Computer Science 4042 115-126 In: Flexible and efficient information handling : 23rd British National Conference on Databases, BNCOD 23, Belfast, Northern Ireland, UK, July 18-20, 2006; proceedings (2006) Berlin [u.a.] BNCOD 23 (Belfast, Northern Ireland, UK) [Konferenzveröffentlichung]

May, Norman ; Helmer, Sven ; Moerkotte, Guido (2006) Strategies for Query Unnesting in XML Databases. ACM Transactions on Database Systems : TODS New York, NY [u.a.] 31 3 968-1013 [Zeitschriftenartikel]

Brantner, Matthias ; Helmer, Sven ; Kanne, Carl-Christian ; Moerkotte, Guido Full-fledged Algebraic XPath Processing in Natix. 705-716 In: Proceedings - 21st International Conference on Data Engineering, ICDE 2005 : 5 - 8 April 2005, National Center of Science, Tokyo, Japan (2005) Los Alamitos, Calif. [u.a.] [Konferenzveröffentlichung]

Pavlov, Aleksei ; Helmer, Sven ; Moerkotte, Guido A Model-Based Monitoring and Diagnosis System for a Space-Based Astrometry Mission. Lecture Notes in Computer Science 3588 920-929 In: Database and expert systems applications : 16th International Conference, DEXA 2005, Copenhagen, Denmark, August 22-26, 2005; proceedings (2005) Berlin [u.a.] [Konferenzveröffentlichung]

Neumann, Thomas ; Helmer, Sven ; Moerkotte, Guido On the Optimal Ordering of Maps and Selections under Factorization. Proceedings / 21st International Conference on Data Engineering, ICDE 2005, 5-8 April 2005, Tokyo, Japan 490-501 In: Proceedings / 21st International Conference on Data Engineering, ICDE 2005, 5-8 April 2005, Tokyo, Japan (2005) Los Alamitos, Calif. [Konferenzveröffentlichung]

Amaral, Vasco Miguel Moreira do ; Helmer, Sven ; Moerkotte, Guido Formally Specifying the Syntax and Semantics of a Visual Query Language for the Domain of High Energy Physics Data Analysis. Proceedings / 2005 IEEE Symposium on Visual Languages and Human-Centric Computing (VL/HCC 2005), 21-24 September 2005, Dallas, TX, USA 251-258 In: Proceedings / 2005 IEEE Symposium on Visual Languages and Human-Centric Computing (VL/HCC 2005), 21-24 September 2005, Dallas, TX, USA (2005) Los Alamitos, Calif. [Konferenzveröffentlichung]

Helmer, Sven ; Kanne, Carl-Christian ; Moerkotte, Guido Timestamp-Based Protocols for Synchronizing Access on XML Documents. Galindo, Fernando Lecture Notes in Computer Science 3180 591-600 In: Database and expert systems applications : 15th International Conference, DEXA 2004, Zaragoza, Spain, August 30 - September 3, 2004; proceedings (2004) Berlin [u.a.] [Konferenzveröffentlichung]

May, Norman ; Helmer, Sven ; Kanne, Carl-Christian ; Moerkotte, Guido XQuery Processing in Natix with an Emphasis on Join Ordering. Manolescu, Ioana Proceedings of the First International Workshop on XQuery Implementation, Experience and Perspectives (XIME-P), in cooperation with ACM SIGMOD, June 17-18, 2004, Maison de la Chimie, Paris, France 49-54 In: XIME-P : Proceedings of the First International Workshop on XQuery Implementation, Experience and Perspectives (XIME-P), in cooperation with ACM SIGMOD, June 17-18, 2004, Maison de la Chimie, Paris, France (2004) New York, NY [Konferenzveröffentlichung]

Helmer, Sven ; Kanne, Carl-Christian ; Moerkotte, Guido (2004) Evaluating Lock-Based Protocols for Cooperation on XML Documents. SIGMOD Record New York, NY 33 1 58-63 [Zeitschriftenartikel]

Amaral, Vasco Miguel Moreira do ; Helmer, Sven ; Moerkotte, Guido PHEASANT: A PHysicist's EAsy ANalysis Tool. Christiansen, Henning Lecture Notes in Computer Science 3055 229-242 In: Flexible query answering systems : 6th International Conference, FQAS 2004, Lyon, France, June 24 - 26, 2004; proceedings (2004) Berlin [u.a.] [Konferenzveröffentlichung]

May, Norman ; Helmer, Sven ; Moerkotte, Guido Nested Queries and Quantifiers in an Ordered Context. Proceedings / 20th International Conference on Data Engineering, ICDE 2004, 30 March - 2 April 2004, Boston, MA, USA 239-250 In: Proceedings - 20th International Conference on Data Engineering, ICDE 2004 : 30 March - 2 April 2004, Boston, Massachusetts, USA (2004) Los Alamitos, Calif. [u.a.] [Konferenzveröffentlichung]

May, Norman ; Helmer, Sven ; Moerkotte, Guido (2003) Nested Queries and Quantifiers in an Ordered Context. Open Access None [Arbeitspapier]
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Helmer, Sven ; Kanne, Carl-Christian ; Moerkotte, Guido (2003) Lock-based Protocols for Cooperation on XML Documents. Open Access None [Arbeitspapier]
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Helmer, Sven ; Neumann, Thomas ; Moerkotte, Guido A Robust Scheme for Multilevel Extendible Hashing. Yazici, Adnan Lecture Notes in Computer Science 2869 220-227 In: Computer and information sciences - ISCIS 2003 : 18th International Symposium, Antalya, Turkey, November 3 - 5, 2003; proceedings (2003) Berlin [u.a.] [Konferenzveröffentlichung]

Helmer, Sven ; Moerkotte, Guido (2003) A performance study of four index structures for set-valued attributes of low cardinality. The VLDB Journal Berlin ; Heidelberg 12 3 244 -261 [Zeitschriftenartikel]

Helmer, Sven (2003) Rezension zu: Bordogna, Gloria (Hrsg.): Recent issues on fuzzy databases. Heidelberg, 2000. Fuzzy Sets and Systems Amsterdam [u.a.] 140 1 229 - 230 [Zeitschriftenartikel]

Helmer, Sven ; Neumann, Thomas ; Moerkotte, Guido Estimating the Output Cardinality of Partial Preaggregation with a Measure of Clusteredness. Freytag, Johann Christoph Proc. 29th Int. Conf. on Very Large Data Bases (VLDB), Berlin, 09.-12.09.2003 656-667 In: Proceedings of the twenty-ninth International Conference on Very Large Databases : Berlin, Germany, 9 - 12 September, 2003 (2003) St. Louis, Mo. [Konferenzveröffentlichung]

Helmer, Sven (2003) Evaluating Different Approaches for Indexing Fuzzy Sets. Fuzzy Sets and Systems Amsterdam [u.a.] 140 1 167 - 182 [Zeitschriftenartikel]

Helmer, Sven ; Kanne, Carl-Christian ; Moerkotte, Guido Lock-based Protocols for Cooperationn on XML Documents. Martin, Danielle C. Proc. 14th Int. Workshop on Database and Expert Systems Applications (at DEXA Conf.), Prague, 01.-05.09.2003 230- 234 In: Proceedings / 14th International Workshop on Database and Expert Systems Applications : 1 - 5 September 2003, Prague, Czech Republic (2003) Los Alamitos, Calif. [u.a.] [Konferenzveröffentlichung]

May, Norman ; Helmer, Sven ; Moerkotte, Guido Quantifiers in XQuery. Catarci, Tiziana Proc. 4th Int. Conf. on Web Information Systems Engineering (WISE), Rome, Italy, 10.-13.12.2003 313-316 In: Proceedings / Fourth International Conference on Web Information Systems Engineering, WISE 2003 : 10 - 12 December 2003, Roma, Italy (2003) Los Alamitos, Calif. [u.a.] [Konferenzveröffentlichung]

May, Norman ; Helmer, Sven ; Moerkotte, Guido Three Cases for Query Decorrelation in XQuery. Bellahsène, Zohra Lecture Notes in Computer Science 2824 70-84 In: Database and XML technologies : first International XML Database Symposium, XSym 2003, Berlin, Germany, September 8, 2003 (2003) Berlin [u.a.] [Konferenzveröffentlichung]

Helmer, Sven ; Kanne, Carl-Christian ; Moerkotte, Guido (2003) XML-Datenbanksysteme und ihre Anwendung. Information Technology : IT Berlin 45 3 137-142 [Zeitschriftenartikel]

Helmer, Sven ; Moerkotte, Guido (2003) Indexstrukturen für XML. Rahm, Erhard Web & Datenbanken : Konzepte, Architekturen, Anwendungen Heidelberg 217-250 [Buchkapitel]

Fiebig, Thorsten ; Helmer, Sven ; Kanne, Carl-Christian ; Mildenberger, Julia ; Moerkotte, Guido ; Schiele, Robert ; Westmann, Till (2002) Anatomy of a Native XML Base Management System. Open Access None [Arbeitspapier]
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Helmer, Sven ; Moerkotte, Guido (2002) Compiling Away Set Containment and Intersection Joins. Open Access Technical Reports Mannheim 02-004 [Arbeitspapier]
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Helmer, Sven ; Neumann, Thomas ; Moerkotte, Guido (2002) Early Grouping Gets the Skew. Open Access Technical Reports Mannheim 02-009 [Arbeitspapier]
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Helmer, Sven ; Kanne, Carl-Christian ; Moerkotte, Guido (2002) Optimized Translation of XPath into Algebraic Expressions Parameterized by Programs Containing Navigational Primitives. Open Access None [Arbeitspapier]
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Fiebig, Thorsten ; Helmer, Sven ; Kanne, Carl-Christian ; Moerkotte, Guido ; Neumann, Julia ; Schiele, Robert ; Westmann, Till (2002) Anatomy of a Native XML Base Management System. The VLDB Journal Berlin ; Heidelberg 11 4 292-314 [Zeitschriftenartikel]

Fiebig, Thorsten ; Helmer, Sven ; Kanne, Carl-Christian ; Moerkotte, Guido ; Neumann, Julia ; Schiele, Robert ; Westmann, Till Natix: A Technology Overview. Chaudhri, Akmal B. Lecture Notes in Computer Science 2593 12-33 In: Web, Web services, and database systems : NODe 2002 Web- and Database-Related Workshops, Erfurt, Germany, October 7 - 10, 2002; revised papers (2002) Berlin [u.a.] [Konferenzveröffentlichung]

Helmer, Sven ; Kanne, Carl-Christian ; Moerkotte, Guido Optimized Translation of XPath into Algebraic Expressions Parameterized by Programs Containing Navigational Primitives. Ling, Tok Wang Proceedings of the 3rd International Conference on Web Information Systems Engineering (WISE), Singapore 215-224 In: Proceedings of the Third International Conference on Web Information Systems Engineering : 12 - 14 December 2002, Singapore (2002) Los Alamitos, Calif. [u.a.] [Konferenzveröffentlichung]

Helmer, Sven ; Kanne, Carl-Christian ; Moerkotte, Guido (2001) Isolation in XML Bases. Open Access None [Arbeitspapier]
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Helmer, Sven ; Neumann, Thomas ; Moerkotte, Guido (2001) A Robust Scheme for Multilevel Extendible Hashing. Open Access None [Arbeitspapier]
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Helmer, Sven Indexing Fuzzy Data. Smith, Michael H. Proc. Joint 9th IFSA World Congress and 20th NAFIPS Int. Conf. 4 2120-2125 In: Joint 9th IFSA World congress and 20th NAFIPS International Conference, Vancouver, British Columbia, Canada, July 25 - 28, 2001; proceedings (2001) Piscataway, NJ [Konferenzveröffentlichung]

Amaral, Vasco Miguel Moreira do ; Moerkotte, Guido ; Amorim, Antonio ; Helmer, Sven Studies for Optimisation of Data Analysis Queries for HEP Using HERA-B Commissioning Data. Chen, Hesheng Int. Conf. on Computing in High Energy and Nuclear Physics (CHEP'01) 1-2 In: Proceedings of the CHEP 2001 Conference Computing in High Energy and Nuclear Physics : (Beijing, China, 3 - 7 September 2001) (2001) Beijing [u.a.] [Konferenzveröffentlichung]

Helmer, Sven (2000) Performance Enhancements for Advanced Database Management Systems. Open Access None [Dissertation]
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Westmann, Till ; Kossmann, Donald ; Helmer, Sven ; Moerkotte, Guido (2000) The implementation and performance of compressed databases. SIGMOD Record New York, NY 29 3 55-67 [Zeitschriftenartikel]

Helmer, Sven ; Moerkotte, Guido (1999) A Study of Four Index Structures for Set-Valued Attributes of Low Cardinality. Open Access Technical Reports Mannheim 99-002 [Arbeitspapier]
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Boss, Birgit ; Helmer, Sven (1999) Index Structures for Efficiently Accessing Fuzzy Data Including Cost Models and Measurements. Fuzzy Sets and Systems Amsterdam [u.a.] 108 1 11-37 [Zeitschriftenartikel]

Westmann, Till ; Kossmann, Donald ; Helmer, Sven ; Moerkotte, Guido (1998) The Implementation and Performance of Compressed Databases. Open Access Technical Reports Mannheim 98-003 [Arbeitspapier]
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Helmer, Sven ; Westmann, Till ; Moerkotte, Guido Diag-Join : An Opportunistic Join Algorithm for 1:N Relationships. Gupta, Ashish Proceedings of the 24th International Conference on Very Large Data Bases (VLDB), New York, USA, August 1998 98-109 In: Proceedings of the twenty-fourth International Conference on Very Large Databases : New York, NY, USA, 24 - 27 August, 1998 (1998) San Francisco, Calif. [Konferenzveröffentlichung]

Helmer, Sven (1997) Index Structures for Databases Containing Data Items with Set-valued Attributes. Open Access Technical Reports Mannheim 97-002 [Arbeitspapier]
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Helmer, Sven ; Westmann, Till ; Moerkotte, Guido (1997) Diag-Join: An Opportunistic Join Algorithm for 1:N Relationships. Open Access None [Arbeitspapier]
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Helmer, Sven ; Moerkotte, Guido Evaluation of Main Memory Join Algorithms for Joins with Set Comparison Join Predicates. Jarke, Matthias Proceedings of the 23rd International Conference on Very Large Data Bases, VLDB, Athen, 26.8.-29.8.1997 386-395 In: Proceedings of the Twenty-third International Conference on Very Large Databases : Athens, Greece, 26 - 29 August, 1997 (1997) San Francisco, Calif. [Konferenzveröffentlichung]

Boss, Birgit ; Helmer, Sven (1996) Indexing a Fuzzy Database Using the Technique of Superimposed Coding - Cost Models and Measurements. Open Access Technical Reports Mannheim 96-002 [Arbeitspapier]
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Helmer, Sven ; Moerkotte, Guido (1996) Evaluation of Main Memory : Join Algorithms for Joins with Set Comparison Predicates. Open Access Technical Reports Mannheim 96-013 [Arbeitspapier]
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