公开(公告)号：US20210042169A1

公开(公告)日：2021-02-11

申请号：US17077946

申请日：2020-10-22

Applicant: HEWLETT PACKARD ENTERPRISE DEVELOPMENT LP

Inventor： Hideaki Kimura ,  Tianzheng Wang ,  Milind M. Chabbi

IPC: G06F9/52

Abstract: In example implementations, a method include receiving a request for a lock in a Mellor-Crummey Scott (MCS) lock protocol from a guest user that is context free (e.g., a process that does not bring a queue node). The lock determines that it contains a null value. The lock is granted to the guest user. A pi value is received from the guest user to store in the lock. The pi value notifies subsequent users that the guest user has the lock.

公开(公告)号：US20190042615A1

公开(公告)日：2019-02-07

申请号：US16072055

申请日：2016-01-29

Applicant: Hewlett Packard Enterprise Development LP

Inventor： Tianzheng Wang ,  Hideaki Kimura

IPC: G06F17/30 ,  G06F9/46

Abstract: Hybrid concurrency control in a database transaction is disclosed. A contention value associated with a database object is read. The contention value is dynamically updated based on access patterns of the database object. If the contention value indicates the database object is under high contention, a pessimistic concurrency control mechanism is applied to the database object. An optimistic concurrency control mechanism is applied to the database object if the contention value does not indicate the database object is under high contention.

公开(公告)号：US11080261B2

公开(公告)日：2021-08-03

申请号：US16072055

申请日：2016-01-29

Applicant: Hewlett Packard Enterprise Development LP

Inventor： Tianzheng Wang ,  Hideaki Kimura

IPC: G06F16/23 ,  G06F16/00 ,  G06F9/46

Abstract: Hybrid concurrency control in a database transaction is disclosed. A contention value associated with a database object is read. The contention value is dynamically updated based on access patterns of the database object. If the contention value indicates the database object is under high contention, a pessimistic concurrency control mechanism is applied to the database object. An optimistic concurrency control mechanism is applied to the database object if the contention value does not indicate the database object is under high contention.

公开(公告)号：US11768716B2

公开(公告)日：2023-09-26

申请号：US17077946

申请日：2020-10-22

Applicant: HEWLETT PACKARD ENTERPRISE DEVELOPMENT LP

Inventor： Hideaki Kimura ,  Tianzheng Wang ,  Milind M. Chabbi

IPC: G06F9/52

CPC classification number: G06F9/526 ,  G06F2209/521

Abstract: In example implementations, a method include receiving a request for a lock in a Mellor-Crummey Scott (MCS) lock protocol from a guest user that is context free (e.g., a process that does not bring a queue node). The lock determines that it contains a null value. The lock is granted to the guest user. A pi value is received from the guest user to store in the lock. The pi value notifies subsequent users that the guest user has the lock.

公开(公告)号：US20180246773A1

公开(公告)日：2018-08-30

申请号：US15756932

申请日：2015-09-10

Applicant: Hewlett Packard Enterprise Development LP

Inventor： Hideaki Kimura ,  Tianzheng Wang ,  Milind M. Chabbi

IPC: G06F9/52

CPC classification number: G06F9/526 ,  G06F2209/521

Abstract: In example implementations, a method include receiving a request for a lock in a Mellor-Crummey Scott (MCS) lock protocol from a guest user that is context free (e.g., a process that does not bring a queue node). The lock determines that it contains a null value. The lock is granted to the guest user. A pi value is received from the guest user to store in the lock. The pi value notifies subsequent users that the guest user has the lock.