User Charge Estimation in Numeric Online Databases: A Methodology |
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Page 14
... selectivity of the elementary predicates on the same attribute is computed . The function nap - selectivity ( for numeric attributes ) recognizes the overlap of the combined range and the value range of the attribute , and divides this ...
... selectivity of the elementary predicates on the same attribute is computed . The function nap - selectivity ( for numeric attributes ) recognizes the overlap of the combined range and the value range of the attribute , and divides this ...
Page 15
... selectivity component . As pointed out by [ YuLi - 82 ] and [ BGWR- 81 ] , the hit - ratio - model by [ Yao - 77 ] can be used for selectivity estimation . If k objects are chosen among n objects that are uniformly distributed over m ...
... selectivity component . As pointed out by [ YuLi - 82 ] and [ BGWR- 81 ] , the hit - ratio - model by [ Yao - 77 ] can be used for selectivity estimation . If k objects are chosen among n objects that are uniformly distributed over m ...
Page 30
... selectivity ( PRED , an , AD1 ) = ( 0 , if c - combine ( a - preds ( PRED , an ) ) = false , 1/02 ( attr - descr ... selectivity of the elementary predicates on the attribute an . ap - selectivity ( PRED , an , AD1 ) = nap - selectivity ...
... selectivity ( PRED , an , AD1 ) = ( 0 , if c - combine ( a - preds ( PRED , an ) ) = false , 1/02 ( attr - descr ... selectivity of the elementary predicates on the attribute an . ap - selectivity ( PRED , an , AD1 ) = nap - selectivity ...
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