公开(公告)号：US10795877B2

公开(公告)日：2020-10-06

申请号：US15900150

申请日：2018-02-20

Applicant: SAP SE

Inventor： Ismail Oukid ,  Wolfgang Lehner ,  Daniel dos Santos Bossle

IPC: G06F12/02 ,  G06F16/23 ,  G06F11/14 ,  G06F12/0808 ,  G06F12/0815

Abstract: Disclosed herein are embodiments for performing multi-version concurrency control (MVCC) in non-volatile memory. An embodiment operates by determining that an event occurred, wherein one or more write transactions to one or more records of a multi-version database that were pending prior to the event did not commit. The one or more write transactions are identified based on a commit value that was stored in the non-volatile memory prior to the event. A particular one of the identified uncommitted write transactions is selected. From the multi-version database, a first version of a record corresponding to the selected uncommitted write transaction that was not committed, and an earlier version of the record that was committed prior to the event are identified. A visibility of the record is set to indicate that the earlier version of the record is visible and the first version of the record is not visible.

公开(公告)号：US20190171721A1

公开(公告)日：2019-06-06

申请号：US15900150

申请日：2018-02-20

Applicant: SAP SE

Inventor： Ismail Oukid ,  Wolfgang Lehner ,  Daniel dos Santos Bossle

IPC: G06F17/30 ,  G06F12/0808 ,  G06F12/02 ,  G06F12/0815

Abstract: Disclosed herein are embodiments for performing multi-version concurrency control (MVCC) in non-volatile memory. An embodiment operates by determining that an event occurred, wherein one or more write transactions to one or more records of a multi-version database that were pending prior to the event did not commit. The one or more write transactions are identified based on a commit value that was stored in the non-volatile memory prior to the event. A particular one of the identified uncommitted write transactions is selected. From the multi-version database, a first version of a record corresponding to the selected uncommitted write transaction that was not committed, and an earlier version of the record that was committed prior to the event are identified. A visibility of the record is set to indicate that the earlier version of the record is visible and the first version of the record is not visible.