发明授权
US09218394B2 Reading rows from memory prior to reading rows from secondary storage
有权
在从二级存储读取行之前从内存中读取行
- 专利标题: Reading rows from memory prior to reading rows from secondary storage
- 专利标题(中): 在从二级存储读取行之前从内存中读取行
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申请号: US12907157申请日: 2010-10-19
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公开(公告)号: US09218394B2公开(公告)日: 2015-12-22
- 发明人: Randy L. Egan , Rafal P. Konik , Roger A. Mittelstadt , Mark W. Theuer
- 申请人: Randy L. Egan , Rafal P. Konik , Roger A. Mittelstadt , Mark W. Theuer
- 申请人地址: US NY Armonk
- 专利权人: INTERNATIONAL BUSINESS MACHINES CORPORATION
- 当前专利权人: INTERNATIONAL BUSINESS MACHINES CORPORATION
- 当前专利权人地址: US NY Armonk
- 代理商 Matthew C. Zehrer; Owen J. Gamon
- 主分类号: G06F17/30
- IPC分类号: G06F17/30
摘要:
In an embodiment, a first plurality of rows of a first table are read from memory in an order of page addresses of pages in the memory that comprise the first plurality of rows. First selected rows from the first plurality of rows that meet a query predicate are stored into a result set. After the reading the first plurality of rows in the order of the page addresses, a second plurality of rows of the first table are read from secondary storage, in an order of row identifiers of the second plurality of the rows in the first table. Second selected rows from the second plurality of rows that meet the query predicate are stored into the result set.
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