发明名称 |
Dynamic semi-join processing with runtime optimization |
摘要 |
Provided are a techniques for processing a query including semi-joins. At execution time, a next semi-join is selected from the semi-joins for execution in a current round of semi-join executions. A reporting threshold is determined that indicates a number of record-identifiers to be retrieved for the determined semi-join. The selected semi-join is executed until the determined number of record identifiers are retrieved.
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申请公布号 |
US7565342(B2) |
申请公布日期 |
2009.07.21 |
申请号 |
US20050222886 |
申请日期 |
2005.09.09 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
FUH YOU-CHIN;LIN FEN-LING;LURIE ANDREI FEDOROVICH;PURCELL TERENCE PATRICK;TSUJI YOICHI;XIA LI |
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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