Concurrency control method of database transaction combining optimistic lock and pessimistic lock
US11263197B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2020 |
| Grant date | Mar 1, 2022 |
| Priority date | — |
| Expiry date | Oct 21, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F16/2365
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A concurrency control method of database transaction combining an optimistic lock and a pessimistic lock includes: integrating a lock in each fragment in a storage range, using a lock table globally, and recording a lock status of the each fragment in the lock table; before reading a data object of a fragment in the storage range, first querying in the lock table whether the data object of the fragment is locked by other reading-writing transactions; if the data object of the fragment is locked by other reading-writing transactions, blocking the current reading operation, and repeating the current reading operation, and if the current reading operation is blocked for more than a given time limit, since the pessimistic lock is invalid, intervening by the optimistic lock, and continuing reading the single row data of the current fragment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.