公开(公告)号：US20180276277A1

公开(公告)日：2018-09-27

申请号：US15992925

申请日：2018-05-30

Applicant: Huawei Technologies Co., Ltd.

Inventor： Guoping Wang ,  Junhua Zhu

IPC: G06F17/30

CPC classification number: G06F16/24544 ,  G06F16/24545

Abstract: A data query method and apparatus, and a database system, where the method includes receiving a data query request, generating an original query plan according to the data query request, obtaining a candidate query plan set according to the original query plan, restructuring a join predicate in the original query plan, determining basic information of a restructured join predicate in the original query plan, determining a constraint condition of the restructured join predicate in the original query plan, determining an equal-cost query plan for the original query plan according to the basic information of the restructured join predicate in the original query plan and the constraint condition of the restructured join predicate in the original query plan, and performing querying according to the equal-cost query plan for the original query plan. Hence, data query performance can be improved.

公开(公告)号：US20240081026A1

公开(公告)日：2024-03-07

申请号：US18505673

申请日：2023-11-09

Applicant: Huawei Technologies Co., Ltd.

Inventor： Yongwang Xiao ,  Linfang Jin ,  Hualin Li ,  Naixiang Xu ,  Guoping Wang

IPC: H05K7/20 ,  G06F1/20

CPC classification number: H05K7/20336 ,  G06F1/203 ,  H05K7/20481 ,  H04M1/026

Abstract: Embodiments of this application provide a terminal device, including a middle frame, a heat source device, a first heat dissipation assembly, and a second heat dissipation assembly, where the first heat dissipation assembly is disposed on one side of the middle frame, the heat source device and the second heat dissipation assembly are disposed on the other side of the middle frame, and at least one of the first heat dissipation assembly and the second heat dissipation assembly is a graphene heat dissipation assembly.

公开(公告)号：US10885034B2

公开(公告)日：2021-01-05

申请号：US15992925

申请日：2018-05-30

Applicant: Huawei Technologies Co., Ltd.

Inventor： Guoping Wang ,  Junhua Zhu

IPC: G06F16/2453

Abstract: A data query method and apparatus, and a database system, where the method includes receiving a data query request, generating an original query plan according to the data query request, obtaining a candidate query plan set according to the original query plan, restructuring a join predicate in the original query plan, determining basic information of a restructured join predicate in the original query plan, determining a constraint condition of the restructured join predicate in the original query plan, determining an equal-cost query plan for the original query plan according to the basic information of the restructured join predicate in the original query plan and the constraint condition of the restructured join predicate in the original query plan, and performing querying according to the equal-cost query plan for the original query plan. Hence, data query performance can be improved.

公开(公告)号：US20210392782A1

公开(公告)日：2021-12-16

申请号：US17284381

申请日：2019-09-25

Applicant: Huawei Technologies Co., Ltd.

Inventor： Yongwang Xiao ,  Linfang Jin ,  Hualin Li ,  Naixiang Xu ,  Guoping Wang

IPC: H05K7/20

Abstract: Embodiments of this application provide a terminal device, including a middle frame, a heat source device, a first heat dissipation assembly, and a second heat dissipation assembly. The first heat dissipation assembly is disposed on one side of the middle frame, the heat source device and the second heat dissipation assembly are disposed on the other side of the middle frame, and at least one of the first heat dissipation assembly and the second heat dissipation assembly is a graphene heat dissipation assembly.

公开(公告)号：US11093522B2

公开(公告)日：2021-08-17

申请号：US16165596

申请日：2018-10-19

Applicant: Huawei Technologies Co., Ltd.

Inventor： Guoping Wang ,  Junhua Zhu

IPC: G06F16/00 ,  G06F16/27 ,  G06F16/18 ,  G06F16/23

Abstract: A database replication method and apparatus for a distributed system are provided and relate to the database field. The method includes: receiving by a coordination server, a timestamp of a multi-partition transaction newly added to a first partition of a secondary cluster; determining, by the coordination server, a target timestamp for the first partition based on the received timestamp of the newly added multi-partition transaction and a stored multi-partition transaction timestamp of each partition of the secondary cluster; and sending, by the coordination server, the target timestamp to the first partition, so that the first partition executes a replication log in the first partition based on the target timestamp. In this way, the corresponding partition can execute, without waiting, a multi-partition transaction that is present in all the partitions but has not been executed, thereby avoiding data inconsistency and increasing replication efficiency.

公开(公告)号：US20190057142A1

公开(公告)日：2019-02-21

申请号：US16165596

申请日：2018-10-19

Applicant: Huawei Technologies Co., Ltd.

Inventor： Guoping Wang ,  Junhua Zhu

IPC: G06F17/30

Abstract: A database replication method and apparatus for a distributed system are provided and relate to the database field. The method includes: receiving by a coordination server, a timestamp of a multi-partition transaction newly added to a first partition of a secondary cluster; determining, by the coordination server, a target timestamp for the first partition based on the received timestamp of the newly added multi-partition transaction and a stored multi-partition transaction timestamp of each partition of the secondary cluster; and sending, by the coordination server, the target timestamp to the first partition, so that the first partition executes a replication log in the first partition based on the target timestamp. In this way, the corresponding partition can execute, without waiting, a multi-partition transaction that is present in all the partitions but has not been executed, thereby avoiding data inconsistency and increasing replication efficiency.