User Charge Estimation in Numeric Online Databases: A Methodology |
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Page 13
... block transfer counts or file access times requires a description of block- and access - related features of the hw / sw environment of the DBMS , e.g. block sizes , data transfer rates and the seek times of disk units . Such data can ...
... block transfer counts or file access times requires a description of block- and access - related features of the hw / sw environment of the DBMS , e.g. block sizes , data transfer rates and the seek times of disk units . Such data can ...
Page 14
... block access times , for example , can now be computed on the basis of these parameters . The data block access time in random block accesses is the seek time plus the rotational delay plus the block transfer time in the theoretical ...
... block access times , for example , can now be computed on the basis of these parameters . The data block access time in random block accesses is the seek time plus the rotational delay plus the block transfer time in the theoretical ...
Page 23
... block length is 2048 bytes , this file requires 1020409 blocks and its scan cost is about 8.16 × 106 ms ( 8 ms per block ) . It would take even longer to access this file via the indices . These cost estimates are based on standard file ...
... block length is 2048 bytes , this file requires 1020409 blocks and its scan cost is about 8.16 × 106 ms ( 8 ms per block ) . It would take even longer to access this file via the indices . These cost estimates are based on standard file ...
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