Compression of timestamps
US7552128B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Jan 25, 2007 |
| Grant date | Jun 23, 2009 |
| Priority date | — |
| Expiry date | Dec 20, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S707/99934
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The method disclosed herein effectively caches timestamps in the memory of a query server. Each index file contains a base time and a set of documents with encoded timestamps. The base timestamp stored represents the index build time. The indexer encodes the timestamp of each document stored in the data directory. The difference of the absolute timestamp and the base timestamp is telescopically quantized into segmented time units. The compressed value of the segmented time units is stored in the index. During the querying process, the encoded timestamps for an individual document is recreated by applying a decoding process carried out in the query server. The reverse of the telescopic quantization is conducted to determine the absolute timestamp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.