发明名称 |
Estimation of input/output requirements for table probe in join processing |
摘要 |
A join operation is costed by estimating the input/output operations (disk swaps) that will be required for retrieval of tuples from the outer and inner tables. A specific method is presented for estimating the number of input/output operations needed for given inner and outer data tables, which method models the retrieval of randomly arranged data from that table.
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申请公布号 |
US2004044651(A1) |
申请公布日期 |
2004.03.04 |
申请号 |
US20020230640 |
申请日期 |
2002.08.29 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
ABDO ABDO ESMAIL |
分类号 |
G06F17/30;(IPC1-7):G06F17/30;G06F7/00 |
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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