Packing nodes into records to store XML XQuery data model and other hierarchically structured data
US8543614B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 2005 |
| Grant date | Sep 24, 2013 |
| Priority date | — |
| Expiry date | Jan 8, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F16/86
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A storage of nodes of hierarchically structured data uses logical node identifiers to reference the nodes stored within and across record data structures. A node identifier index is used to map each logical node identifier to a record identifier for the record that contains the node. When a sub-tree is stored in a separate record, a proxy node is used to represent the sub-tree in the parent record. The mapping in the node identifier index reflects the storage of the sub-tree nodes in the separate record. Since the references between the records are through logical node identifiers, there is no limitation to the moving of records across pages, as long as the indices are updated or rebuilt to maintain synchronization with the resulting data pages. This approach is highly scalable and has a much smaller storage consumption than approaches that use explicit references between nodes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.