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公开(公告)号：US10922297B2
公开(公告)日：2021-02-16
申请号：US15908724
申请日：2018-02-28
Applicant: SAP SE
Inventor： Rahul Mittal , Amit Pathak , Jay Sudrik , Simhachala Sasikanth Gottapu
Abstract: A system for an in-memory row storage architecture can be provided. In some implementations, the system performs operations including processing a database statement comprising a first database transaction affecting one or more rows in an in-memory row store, registering the database statement at a start of execution of the database statement, the start of execution occurring at a first time, unregistering the registered database statement at an end of execution of the database statement, determining a second time at which execution of an oldest currently registered database statement was started, assigning a garbage collection thread to a second database transaction committed at a third time and affecting at least one row of the plurality of rows, and activating the garbage collection thread to reclaim memory within the in-memory row store when the third time is less than the second time. Related systems, methods, and articles of manufacture are also described.
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公开(公告)号：US10346384B2
公开(公告)日：2019-07-09
申请号：US15359050
申请日：2016-11-22
Applicant: SAP SE
Inventor： Rahul Mittal , Jay Sudrik , Amit Pathak
Abstract: Example embodiments of a database employing an efficient form of multi-version concurrency control (MVCC) are described. In an example embodiment, in response to receiving an update command for a first row of a plurality of rows of a database, an image of the first row stored in a first memory area is stored in a second memory area. In a third memory area storing a first database structure and associated pointer corresponding to the image of the first row stored in the first memory area, a second data structure and associated pointer corresponding to the image of the first row in the second memory area are stored. The second data structure is linked to the first data structure. The image of the first row in the first memory area is overwritten with an image of a new version of the first row provided in the update command.
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公开(公告)号：US20180349270A1
公开(公告)日：2018-12-06
申请号：US15908724
申请日：2018-02-28
Applicant: SAP SE
Inventor： Rahul Mittal , Amit Pathak , Jay Sudrik , Simhachala Sasikanth Gottapu
CPC classification number: G06F17/30377 , G06F3/061 , G06F3/065 , G06F3/0673 , G06F11/1471 , G06F17/30336 , G06F17/30339 , G06F17/30575 , G06F2201/80 , G06F2201/82
Abstract: A system for an in-memory row storage architecture can be provided. In some implementations, the system performs operations including processing a database statement comprising a first database transaction affecting one or more rows in an in-memory row store, registering the database statement at a start of execution of the database statement, the start of execution occurring at a first time, unregistering the registered database statement at an end of execution of the database statement, determining a second time at which execution of an oldest currently registered database statement was started, assigning a garbage collection thread to a second database transaction committed at a third time and affecting at least one row of the plurality of rows, and activating the garbage collection thread to reclaim memory within the in-memory row store when the third time is less than the second time. Related systems, methods, and articles of manufacture are also described.
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公开(公告)号：US20170308547A1
公开(公告)日：2017-10-26
申请号：US15137648
申请日：2016-04-25
Applicant: SAP SE
Inventor： Gaurav Kumar GUPTA , Souvik Pal , Amit Pathak , Jay Sudrik
IPC: G06F17/30
CPC classification number: G06F16/178 , G06F16/182 , G06F16/27
Abstract: Disclosed herein are system, method, and computer program product embodiments for synchronizing an unsynchronized distributed database system. An embodiment operates by locking, by a second node, partitions in the second node based on first information received from, a first node responsive to execution of partition utility based on a first query received by the first node. Blocking, by the second node, a second query to a data portion of the partitions in the second node based on the first information. Locking, by the second node, second node object metadata based on second information received from the first node. Receiving, by the second node, changes to first node object metadata and applying the changes to the second node object metadata. Unlocking, by the second node, the partitions in the second node and the second node object metadata while unblocking the second query.
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