Data search using bloom filters and NAND based content addressable memory
US8817541B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 2013 |
| Grant date | Aug 26, 2014 |
| Priority date | — |
| Expiry date | Mar 14, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C2213/75
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A NAND Flash based content addressable memory (CAM) is used for a key-value addressed storage drive. A host writes a key-value pair to the drive, where the drive writes the keys along bit lines of a CAM NAND portion of the drive and stores the value in the drive. The drive then maintains a table linking the keys to location of the value. In a read process, the host provides a key to drive, which then broadcasts down the word lines of blocks storing the keys. Based on any matching bit lines, the tables can then be used to retrieve and supply the corresponding data to the host. This arrangement can be applied to data search operations using bloom filters stored along bit lines of search matrix, where the search matrix can extend across large numbers of arrays. In the example of an internet search, the bloom filters are formed from key words associated with a website are stored along bit lines of the matrix and corresponding URLs are stored in primary storage. In response to search word based query, any matching URLs are returned.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.