User Charge Estimation in Numeric Online Databases: A Methodology |
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Page 23
... result . The restriction on the right gives those tuples from the MARKETS - relation which contain the YEAR - value 1984 and the COUNTRY - value TAHITI ( the symbol means the same as and ) . The intermediate relation ( file ) F2 is ...
... result . The restriction on the right gives those tuples from the MARKETS - relation which contain the YEAR - value 1984 and the COUNTRY - value TAHITI ( the symbol means the same as and ) . The intermediate relation ( file ) F2 is ...
Page 21
... result cardinality , and even then the FDs are used to improve the accuracy of the pure hit - ratio model . Before considering the approach , the closure of a set of FDs , the evaluation of the FD - sets of the results of projections ...
... result cardinality , and even then the FDs are used to improve the accuracy of the pure hit - ratio model . Before considering the approach , the closure of a set of FDs , the evaluation of the FD - sets of the results of projections ...
Page 29
... result . Because the operand of this sample projection is a pipe file , the result can be computed in the central memory and at no cost . In general , however , the operands may have varying file structures , and in all the cases their ...
... result . Because the operand of this sample projection is a pipe file , the result can be computed in the central memory and at no cost . In general , however , the operands may have varying file structures , and in all the cases their ...
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