User Charge Estimation in Numeric Online Databases: A Methodology |
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Page 28
... standard approach . Its advantages are its generality and simplicity : only relatively few parameters are necessary in cardinality estimation . However , the data in the databases often do not fully agree with the simplifying ...
... standard approach . Its advantages are its generality and simplicity : only relatively few parameters are necessary in cardinality estimation . However , the data in the databases often do not fully agree with the simplifying ...
Page 3
... standard approach assumes uniform distributions of the records over the values of the attributes ( i.e. fields ) in the file and independence among the values of the attributes , e.g. in [ BGWR - 81 ] [ GeGa - 82 ] [ Rose - 81 ] [ SACL ...
... standard approach assumes uniform distributions of the records over the values of the attributes ( i.e. fields ) in the file and independence among the values of the attributes , e.g. in [ BGWR - 81 ] [ GeGa - 82 ] [ Rose - 81 ] [ SACL ...
Page 7
... standard features . First , the FD - set is a major deviation from the standard approach . According to [ GeGa - 82 ] and [ GePu - 84 ] , FDs are essential for correct cardinality estimation of projections . However , so far they have ...
... standard features . First , the FD - set is a major deviation from the standard approach . According to [ GeGa - 82 ] and [ GePu - 84 ] , FDs are essential for correct cardinality estimation of projections . However , so far they have ...
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