User Charge Estimation in Numeric Online Databases: A Methodology |
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Page 14
... functions n - combine for numeric attributes and c - combine for character string attributes . For numeric attributes , the function p - range gives the accepted value range of each elementary predicate . For example , p - range ...
... functions n - combine for numeric attributes and c - combine for character string attributes . For numeric attributes , the function p - range gives the accepted value range of each elementary predicate . For example , p - range ...
Page 28
... function sub is used in the computation of attribute ranges . Let a and b be any integers , such that a ≥ b . sub ( a , b ) = a - b , if a > b otherwise . PREDICATE MANIPULATION Given a general predicate PRED , the function elem - set ...
... function sub is used in the computation of attribute ranges . Let a and b be any integers , such that a ≥ b . sub ( a , b ) = a - b , if a > b otherwise . PREDICATE MANIPULATION Given a general predicate PRED , the function elem - set ...
Page 24
... function m - search - cost finds out the optimal use of indices . Despite these features , the modular structure of m - search - cost makes it simple to restrict the alternatives under consideration to those supported by the DBMS . This ...
... function m - search - cost finds out the optimal use of indices . Despite these features , the modular structure of m - search - cost makes it simple to restrict the alternatives under consideration to those supported by the DBMS . This ...
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