Maintaining cross-node coherence of an in-memory database object in a multi-node database cluster
US10216781B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 2015 |
| Grant date | Feb 26, 2019 |
| Priority date | — |
| Expiry date | May 11, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2212/465
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Techniques are described for maintaining coherency of a portion of a database object populated in the volatile memories of multiple nodes in a database cluster. The techniques involve maintaining a local invalidation bitmap for chunks of data stored in memory in each particular node in the cluster by tracking locks granted by a lock manager. During a pre-loading operation, each given node requests a set of shared locks associated with the chunks of data to be store in the given node's memory. When a request to release one of these shared locks occurs, the in-memory copy of those data items may be invalidated in the node releasing its shared lock.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.