公开(公告)号：US20200042533A1

公开(公告)日：2020-02-06

申请号：US16599722

申请日：2019-10-11

Applicant: SAP SE

Inventor： Joo Yeon Lee ,  Jaehwa Kim ,  Joongkoo Lee

IPC: G06F16/27 ,  G06F16/22

Abstract: Methods and systems are disclosed for managing replication of metadata in a master-slave database environment. While metadata is managed on a master node using database tables with transaction guarantees, metadata copies on the slave node are managed using a lightweight key-value store. In exemplary embodiments, master metadata database tables are mapped to respective key-value structures at one or more slave nodes. The key-value structures have entries pointing to respective metadata objects, which include copies of metadata items stored in the master metadata database tables. The key-value structures can be hierarchically organized under a parent key-value structure. Metadata object versions can be organized as a linked list to facilitate multi-version concurrency control. Methods are disclosed for building the key-value store, for retrieving metadata from the store, for updating the store, for providing multi-version concurrency control, and for pruning obsolete metadata versions. Variants are disclosed.

公开(公告)号：US11176167B2

公开(公告)日：2021-11-16

申请号：US16599722

申请日：2019-10-11

Applicant: SAP SE

Inventor： Joo Yeon Lee ,  Jaehwa Kim ,  Joongkoo Lee

IPC: G06F17/30 ,  G06F16/27 ,  G06F16/22

Abstract: Methods and systems are disclosed for managing replication of metadata in a master-slave database environment. While metadata is managed on a master node using database tables with transaction guarantees, metadata copies on the slave node are managed using a lightweight key-value store. In exemplary embodiments, master metadata database tables are mapped to respective key-value structures at one or more slave nodes. The key-value structures have entries pointing to respective metadata objects, which include copies of metadata items stored in the master metadata database tables. The key-value structures can be hierarchically organized under a parent key-value structure. Metadata object versions can be organized as a linked list to facilitate multi-version concurrency control. Methods are disclosed for building the key-value store, for retrieving metadata from the store, for updating the store, for providing multi-version concurrency control, and for pruning obsolete metadata versions. Variants are disclosed.

公开(公告)号：US10482103B2

公开(公告)日：2019-11-19

申请号：US15592075

申请日：2017-05-10

Applicant: SAP SE

Inventor： Joo Yeon Lee ,  Jaehwa Kim ,  Joongkoo Lee

IPC: G06F16/27 ,  G06F16/22

Abstract: Methods and systems are disclosed for managing replication of metadata in a master-slave database environment. While metadata is managed on a master node using database tables with transaction guarantees, metadata copies on the slave node are managed using a lightweight key-value store. In exemplary embodiments, master metadata database tables are mapped to respective key-value structures at one or more slave nodes. The key-value structures have entries pointing to respective metadata objects, which include copies of metadata items stored in the master metadata database tables. The key-value structures can be hierarchically organized under a parent key-value structure. Metadata object versions can be organized as a linked list to facilitate multi-version concurrency control. Methods are disclosed for building the key-value store, for retrieving metadata from the store, for updating the store, for providing multi-version concurrency control, and for pruning obsolete metadata versions. Variants are disclosed.

公开(公告)号：US20180329967A1

公开(公告)日：2018-11-15

申请号：US15592075

申请日：2017-05-10

Applicant: SAP SE

Inventor： Joo Yeon Lee ,  Jaehwa Kim ,  Joongkoo Lee

IPC: G06F17/30

Abstract: Methods and systems are disclosed for managing replication of metadata in a master-slave database environment. While metadata is managed on a master node using database tables with transaction guarantees, metadata copies on the slave node are managed using a lightweight key-value store. In exemplary embodiments, master metadata database tables are mapped to respective key-value structures at one or more slave nodes. The key-value structures have entries pointing to respective metadata objects, which include copies of metadata items stored in the master metadata database tables. The key-value structures can be hierarchically organized under a parent key-value structure. Metadata object versions can be organized as a linked list to facilitate multi-version concurrency control. Methods are disclosed for building the key-value store, for retrieving metadata from the store, for updating the store, for providing multi-version concurrency control, and for pruning obsolete metadata versions. Variants are disclosed.