发明名称 |
SYSTEM FOR ESTIMATING CARDINALITY IN A DATABASE SYSTEM |
摘要 |
A system for estimating cardinalities for a plurality of columns in a database system is disclosed. The system include obtaining statistics collected for the plurality of columns. A first portion of the statistics indicates at least one relationship between at least a portion of the plurality of columns, while a second portion of the statistics includes single column statistics. The system also include utilizing the first portion and the second portion of the statistics to estimate the cardinality for the plurality of columns.
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申请公布号 |
US2009012977(A1) |
申请公布日期 |
2009.01.08 |
申请号 |
US20080209382 |
申请日期 |
2008.09.12 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
CORVINELLI VINCENT;DEIGIN YURI;HORNIBROOK JOHN F.;TRAN TAM MINH DAI |
分类号 |
G06F17/30 |
主分类号 |
G06F17/30 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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