Database apparatus
US6240418A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 24, 1998 |
| Grant date | May 29, 2001 |
| Priority date | — |
| Expiry date | Mar 24, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S707/99942
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A data processing system including a processor device associated with memory device. The processor is capable of running user application programs to communicate with a database management system that includes database file management system, for accessing data records stored in the memory. The database file management system includes: a probabilistic access indexing file (PAIF) having a plurality of nodes and links. The leave nodes of the PAIF are associated with data records accessible to the user application program. A portion of the data record constitutes a search-key. Selected nodes in the PAIF represent an offset of a search key portion within a search key and link(s) originated from each node among the selected nodes. For each of the selected nodes, except for the leaf node, there exists a subordinated node having an offset larger than the offset of the selected node. A search path in the PAIF commences from a root node and ends at a leaf node which is associated with a given search key. The search path defines a first series of I search key portion values at the corresponding I offsets which conform to a second series of I search key portions at the same I offsets within t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.