User Charge Estimation in Numeric Online Databases: A Methodology |
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Page 24
... course , be applied as such to NDBs based on other data models . They can be applied directly to RDM - based NDBs and with some caution to databases based on traditional flat files . With respect to other data models the results ...
... course , be applied as such to NDBs based on other data models . They can be applied directly to RDM - based NDBs and with some caution to databases based on traditional flat files . With respect to other data models the results ...
Page 23
... course , such estimation possibilities could also be utilized by the optimizer in access strategy selection . ) The cost estimation functions must take the characteristics and parameters of the possible file structures into account . In ...
... course , such estimation possibilities could also be utilized by the optimizer in access strategy selection . ) The cost estimation functions must take the characteristics and parameters of the possible file structures into account . In ...
Page 31
... course , the users do not have to learn to read the file descriptions . These can be visualized for them in a more convenient format . This issue must be considered when actual cost estimation tools are developed on the basis of the ...
... course , the users do not have to learn to read the file descriptions . These can be visualized for them in a more convenient format . This issue must be considered when actual cost estimation tools are developed on the basis of the ...
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