公开(公告)号：US10990571B1

公开(公告)日：2021-04-27

申请号：US15904646

申请日：2018-02-26

Applicant: Amazon Technologies, Inc.

Inventor： Zhaohui Zhang ,  Sheng-Liang Song ,  Aakash Shah ,  Kamal Kant Gupta ,  Xiaofeng Bao ,  Saileshwar Krishnamurthy

IPC: G06F16/22 ,  G06F16/21 ,  G06F16/23

Abstract: Online reordering for database table columns may allow a user to reorder the columns of a database table without taking the database offline. A mapping between different column orders for a database table may be generated and stored in response to a request to reorder columns in a database table. When a portion of the database table is accessed, the columns of the database table in the accessed portion of the database table may be reordered to perform the access request.

公开(公告)号：US10909091B1

公开(公告)日：2021-02-02

申请号：US15360787

申请日：2016-11-23

Applicant: Amazon Technologies, Inc.

Inventor： Aakash Shah ,  Kamal Kant Gupta ,  Alexandre Olegovich Verbitski ,  Sailesh Krishnamurthy ,  Hyungsoo Jung ,  Anurag Windlass Gupta ,  Zhaohui Zhang ,  Tengiz Kharatishvili ,  Stefano Stefani

IPC: G06F16/21 ,  G06F16/23 ,  G06F16/22

Abstract: A data store may implement on-demand data schema modifications. Request to change a schema for a data set in a data store may be received and a description of the change recorded as part of a schema history for the data set. The request to change the schema may then be acknowledged. When access requests directed to the data set are received at the data store, the schema history for the data set may be evaluated. If the schema history indicates that data that is to be accessed in order to service the data store needs to include one or more changes in the schema history, then a version of the schema that includes the one or more changes may be applied to the data.