Facilitating operations on pluggable databases using separate logical timestamp services
US10891291B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 2016 |
| Grant date | Jan 12, 2021 |
| Priority date | — |
| Expiry date | Dec 24, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F16/953
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A refreshable PDB clone is associated with a PDB-specific logical timestamp (LT) service that continuously reflects the LT of the most recent changes that have fully committed within the PDB clone during a refresh operation. Such an LT service is used to perform queries over the changing data in the PDB clone while the PDB clone is undergoing a refresh operation. Furthermore, a PDB-specific LT service can facilitate write operations in a standby CDB, where the standby CDB is a physical standby of a source CDB. Specifically, a standby CDB is configured with a private read-write PDB that does not replicate data from the source CDB. This private PDB may accommodate a write operation required by a query over data in the standby CDB. A PDB-specific LT service provides LTs for such a private PDB where the PDB-specific LT service provides LTs to order changes made within the private PDB.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.