发明名称 |
Efficient implementation of an index structure for multi-column bi-directional searches |
摘要 |
An index structure for use by a database management system comprises a variant of a Patricia tree, wherein each node stores a column value that identifies a specified column of the constructed n-column search key that is used to determine a next path taken through the tree, a null value N that specifies whether a null value or an actual data value of the specified column of the constructed n-column search key is used to determine the next path taken through the tree, and a position value that specifies a portion of the specified column from the constructed n-column search key to be used to determine the next path taken through the tree when the actual data value of the specified column of the constructed n-column search key is used to determine the next path taken through the tree.
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申请公布号 |
US6965894(B2) |
申请公布日期 |
2005.11.15 |
申请号 |
US20020104684 |
申请日期 |
2002.03.22 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
LEUNG TING Y.;TANG KAR MING;PHAM THANH TAN |
分类号 |
G06F17/30;(IPC1-7):G06F17/30 |
主分类号 |
G06F17/30 |
代理机构 |
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代理人 |
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地址 |
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