公开(公告)号：US12298961B1

公开(公告)日：2025-05-13

申请号：US18478069

申请日：2023-09-29

Applicant: Amazon Technologies, Inc.

Inventor： Jin Chen ,  Anand Kumar Thakur ,  Upendra Govindagowda ,  Gaurav Kumar Gupta ,  David Charles Wein ,  Saleem Mohideen ,  Alexandre Olegovich Verbitski

IPC: G06F17/00 ,  G06F7/00 ,  G06F16/23

Abstract: Clock times may be stored at nodes of a database system that are used to provide access to database data using Multi-Version Concurrency Control (MVCC) and implement isolation for distributed transactions. When an access request is received at a processing node of a database, the snapshot time of the access request is determined. The snapshot may be a range of time, with an earliest and latest timestamp. If the snapshot time has a latest time stamp greater than a current timestamp in the clock time, then the clock time may be updated. The clock time and snapshot time may be used to implement time-based MVCC to select a version of a tuple stored in the database to use for performing the access request.