User Charge Estimation in Numeric Online Databases: A Methodology |
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Page 1
... important limitations : BDBS contain only references , which as such are not usually of interest to the database ... importance in information retrieval ( IR ) : in 1982 in the USA about one half of the thousand available public online ...
... important limitations : BDBS contain only references , which as such are not usually of interest to the database ... importance in information retrieval ( IR ) : in 1982 in the USA about one half of the thousand available public online ...
Page 8
... importance of costs of queries to database users , because they often have alternative sources of information or may ... important in future . 2.2 . The effects on information seeking and use The effects of NDBs on information seeking ...
... importance of costs of queries to database users , because they often have alternative sources of information or may ... important in future . 2.2 . The effects on information seeking and use The effects of NDBs on information seeking ...
Page 2
... important role in cost estimation . Cardinality estimation is a common subproblem in both cases . Due to the characteristics of NDBS , cardinality estimation is an important research problem on its own right , although it is not a ...
... important role in cost estimation . Cardinality estimation is a common subproblem in both cases . Due to the characteristics of NDBS , cardinality estimation is an important research problem on its own right , although it is not a ...
Contents
USER CHARGING | 13 |
THE RELATIONAL DATA MODEL | 20 |
CARDINALITY ESTIMATION IN NUMERIC ONLINE | 32 |
Copyright | |
7 other sections not shown
Common terms and phrases
A-names access strategy Appendix approach attribute description set attribute name set attribute selectivity attribute values attributes PRODUCT-NO basis BDBs candidate keys cardinality estimation charging methods CODATA components computed connect-time considered constructed data model database files Database Management Database Management Systems database user developed elementary predicates English Summary example expression F1 and F2 FD-set file design file organization file structures Finland functional dependencies implementation information retrieval Information Science intermediate files inverted file Järvelin join attribute join predicate julkaisuja manipulation MANUF-NO MARKET-SHARE methodology n-tuple NDBs Numeric Databases online databases operand file description procedure cost model processing cost PRODUCTS file QSALES query cardinality query cost modelling query negotiation query optimization query processing query results r-card r-description RA operations records relational algebra relational data model restriction predicate result file description SIGMOD sort-key storage parameters Systems TAHITI TRADEMARK TYPE unit charges University of Tampere upper bound user charge estimation vendor