User Charge Estimation in Numeric Online Databases: A Methodology |
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Page 17
... expressed by many western governments . For example in Finland , the State Science Council , which is an advisory board for the government on science issues , has expressed as its view that access to information must not depend on one's ...
... expressed by many western governments . For example in Finland , the State Science Council , which is an advisory board for the government on science issues , has expressed as its view that access to information must not depend on one's ...
Page 22
... expression the same query would look like this : = Q1 = projection ( join ( restriction ( PRODUCTS , ( TYPE , = , 19500 ) ) , restriction ( MARKETS , ( COUNTRY , = , TAHITI ) ( YEAR , = , 1984 ) ) , ( PRODUCT - NO , = , PRODUCT ...
... expression the same query would look like this : = Q1 = projection ( join ( restriction ( PRODUCTS , ( TYPE , = , 19500 ) ) , restriction ( MARKETS , ( COUNTRY , = , TAHITI ) ( YEAR , = , 1984 ) ) , ( PRODUCT - NO , = , PRODUCT ...
Page 11
... expression and then the corresponding cardinality estimation expression is constructed . In the latter expression , each RA operation of the query is represented by its cardinality estimation model ( e.g. r - description for ...
... expression and then the corresponding cardinality estimation expression is constructed . In the latter expression , each RA operation of the query is represented by its cardinality estimation model ( e.g. r - description for ...
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