User Charge Estimation in Numeric Online Databases: A Methodology |
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Page 24
... sort order ( sort - key ) , the operand file description F and the storage parameters sp . If the operand file is sorted , i.e. sk ( F ) λ and the argument sort - key has the same value , then the cost estimate is given for output ...
... sort order ( sort - key ) , the operand file description F and the storage parameters sp . If the operand file is sorted , i.e. sk ( F ) λ and the argument sort - key has the same value , then the cost estimate is given for output ...
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... sort - key , sp ) are the operand file description F , the restriction predicate PRED , the requested output sort order sort - key , and the storage parameters sp ( see the definition in the Appendix ) . Now the expression r ...
... sort - key , sp ) are the operand file description F , the restriction predicate PRED , the requested output sort order sort - key , and the storage parameters sp ( see the definition in the Appendix ) . Now the expression r ...
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... sort - key , if sort - key e { 02 ( 02 ( 05 ( F1 ) ) ) , 02 ( 02 ( 05 ( F2 ) ) ) } 02 ( 02 ( 05 ( F2 ) ) ) , otherwise . THE COST MODEL FOR THE KEY - PRESERVING PROJECTION PROCEDURE Definition - A12 : Let F1 be a file description , PA ...
... sort - key , if sort - key e { 02 ( 02 ( 05 ( F1 ) ) ) , 02 ( 02 ( 05 ( F2 ) ) ) } 02 ( 02 ( 05 ( F2 ) ) ) , otherwise . THE COST MODEL FOR THE KEY - PRESERVING PROJECTION PROCEDURE Definition - A12 : Let F1 be a file description , PA ...
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