User Charge Estimation in Numeric Online Databases: A Methodology |
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Page 6
... attribute description set describes the properties of each attribute in a file . This component is a set of attribute descriptions , each of which is a five - tuple containing the following components : ⚫ the attribute name , e.g. ...
... attribute description set describes the properties of each attribute in a file . This component is a set of attribute descriptions , each of which is a five - tuple containing the following components : ⚫ the attribute name , e.g. ...
Page 23
... attribute description set of the result file description . No changes in the attribute selectivities or lower and upper bounds occur . The function p - a - descr , which has the operand file description and the projected attribute name set ...
... attribute description set of the result file description . No changes in the attribute selectivities or lower and upper bounds occur . The function p - a - descr , which has the operand file description and the projected attribute name set ...
Page 9
... attribute description set and functional dependency set are given in [ 16 ] . The attribute description set describes the properties of each attribute in a file . It comprises a set of attribute descriptions , each of which is a six ...
... attribute description set and functional dependency set are given in [ 16 ] . The attribute description set describes the properties of each attribute in a file . It comprises a set of attribute descriptions , each of which is a six ...
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