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XPU
2010
Springer
13 years 5 months ago
Extreme Product Line Engineering - Refactoring for Variability: A Test-Driven Approach
Software product lines - families of similar but not identical software products - need to address the issue of feature variability. That is, a single feature might require various...
Yaser Ghanam, Frank Maurer
AAAI
2008
13 years 9 months ago
Existentially Quantified Values for Queries and Updates of Facts in Transaction Logic Programs
In several applications of logic programming and Transaction Logic, such as, planning, trust management and independent Semantic Web Services, an action might produce incomplete f...
Paul Fodor
SIGMOD
1996
ACM
131views Database» more  SIGMOD 1996»
13 years 11 months ago
Materialized View Maintenance and Integrity Constraint Checking: Trading Space for Time
We investigate the problem of incremental maintenance of an SQL view in the face of database updates, and show that it is possible to reduce the total time cost of view maintenanc...
Kenneth A. Ross, Divesh Srivastava, S. Sudarshan
VLDB
2001
ACM
190views Database» more  VLDB 2001»
13 years 11 months ago
LEO - DB2's LEarning Optimizer
Most modern DBMS optimizers rely upon a cost model to choose the best query execution plan (QEP) for any given query. Cost estimates are heavily dependent upon the optimizer’s e...
Michael Stillger, Guy M. Lohman, Volker Markl, Mok...
ICDE
2007
IEEE
125views Database» more  ICDE 2007»
14 years 8 months ago
Collecting and Maintaining Just-in-Time Statistics
Traditional DBMSs decouple statistics collection and query optimization both in space and time. Decoupling in time may lead to outdated statistics. Decoupling in space may cause s...
Amr El-Helw, Ihab F. Ilyas, Wing Lau, Volker Markl...