发明授权
- 专利标题: Database searching using trapeze fetch
- 专利标题(中): 使用trapeze fetch进行数据库搜索
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申请号: US10032915申请日: 2001-12-28
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公开(公告)号: US06970865B1公开(公告)日: 2005-11-29
- 发明人: James M. Plasek , Jennifer J. Smith , Joseph M. Sandin
- 申请人: James M. Plasek , Jennifer J. Smith , Joseph M. Sandin
- 申请人地址: US PA Blue Bell
- 专利权人: Unisys Corporation
- 当前专利权人: Unisys Corporation
- 当前专利权人地址: US PA Blue Bell
- 代理商 Lise A. Rode; Mark T. Starr
- 主分类号: G06F7/00
- IPC分类号: G06F7/00 ; G06F17/30
摘要:
A method and apparatus for improving search performance in databases organized in B Tree or B+ Tree format has an automatic determination and switching between two methods. It also searches to the end of a current leaf page even if a current value for all key parameters has been fulfilled in the search prior to reaching the end of the current leaf page. Swinging across and thus skipping leaf pages to fetch a next leaf page (trapeze fetching or swinging) is activated only either initially or where a B Tree search has resulted in a skipping of leaf pages previously in a search. User interference with the automatic selection of search type between next sequential leaf or trapeze type is not provided for and not allowed.
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