公开(公告)号：US20200272628A1

公开(公告)日：2020-08-27

申请号：US16863831

申请日：2020-04-30

Applicant: Snowflake Inc.

Inventor： Benoit Dageville ,  Yi Fang ,  Martin Hentschel ,  Ashish Motivala ,  Spyridon Triantafyllis ,  Yizhi Zhu

IPC: G06F16/2455 ,  G06F16/23

Abstract: The subject technology receives first metadata corresponding to a set of micro-partitions. The subject technology generates second metadata for a grouping of the first metadata. The subject technology generates a first data structure including the first metadata and a second data structure including the second metadata, the second data structure including information associating the second metadata to the first metadata. The subject technology stores the first data structure and the second data structure in persistent storage as a first file and a second file. The subject technology receives a query on a table. Further, the subject technology analyzes the query against cumulative table metadata to determine whether data stored in the table matches the query.

公开(公告)号：US20240330124A1

公开(公告)日：2024-10-03

申请号：US18192269

申请日：2023-03-29

Applicant: Snowflake Inc.

Inventor： Yi Fang ,  Kedar Nitin Shah ,  Yantao Song

IPC: G06F11/14 ,  G06F16/22

CPC classification number: G06F11/1469 ,  G06F16/2282 ,  G06F2201/80 ,  G06F2201/835

Abstract: Provided herein are systems and methods for configuring data recovery. A method includes decoding, by at least one hardware processor, a request to recover historical table data. The request is received from an account of a data provider. The historical table data includes a plurality of partition files. Each of the plurality of partition files includes a deleted file designation. Based on the request, a recovery process of the plurality of partition files is performed to obtain recovered partition files. A schema associated with the historical table data is retrieved. Metadata corresponding to the retrieved schema is generated. The metadata is associated with the recovered partition files to recover the historical table data.

公开(公告)号：US11822582B2

公开(公告)日：2023-11-21

申请号：US17896446

申请日：2022-08-26

Applicant: SNOWFLAKE INC.

Inventor： Yi Fang ,  Varun Ganesh ,  Xinglian Liu ,  Ryan Michael Thomas Shelly ,  Jiaqi Yan ,  Yizhi Zhu

IPC: G06F16/28

CPC classification number: G06F16/285

Abstract: Embodiments of the present disclosure describe systems, methods, and computer program products for improving query processing of a database. An example method can include: storing table data for a table in a plurality of micro-partitions, each micro-partition comprising a portion of the table data for the table; for each micro-partition of the plurality of micro-partitions, storing metadata for the micro-partition in at least one of a plurality of expression properties; and selecting, by a processing device, a subset of the plurality of expression properties to be grouped into a grouping expression property based at least partially on the metadata of the subset of the plurality of the expression properties. The grouping expression property may include cumulative metadata associated with the metadata of the subset of the plurality of expression properties.

公开(公告)号：US20210049179A1

公开(公告)日：2021-02-18

申请号：US17086279

申请日：2020-10-30

Applicant: Snowflake Inc.

Inventor： Benoit Dageville ,  Yi Fang ,  Martin Hentschel ,  Ashish Motivala ,  Spyros Triantafyllis ,  Yizhi Zhu

IPC: G06F16/2455 ,  G06F16/23 ,  G06F16/2457 ,  G06F16/22 ,  G06F16/2458 ,  G06F16/27

Abstract: The subject technology receives first metadata corresponding to a set of micro-partitions. The subject technology stores a first data structure and a second data structure in storage as a first file and a second file, first data structure including the first metadata and a second data structure including second metadata, the first metadata corresponding to a set of micro-partitions, the second metadata for a grouping of the first metadata, the second data structure including information associating the second metadata to the first metadata. The subject technology stores third metadata for a table, the third metadata comprising: cumulative table metadata comprising global information about a plurality of micro-partitions of the table, the cumulative table metadata being stored in a metadata micro-partition associated with the table.

公开(公告)号：US11055291B2

公开(公告)日：2021-07-06

申请号：US17086275

申请日：2020-10-30

Applicant: Snowflake Inc.

Inventor： Benoit Dageville ,  Yi Fang ,  Martin Hentschel ,  Ashish Motivala ,  Spyridon Triantafyllis ,  Yizhi Zhu

IPC: G06F16/2455 ,  G06F16/23 ,  G06F16/2457 ,  G06F16/22 ,  G06F16/2458 ,  G06F16/27

Abstract: The subject technology generates a first data structure including first metadata and a second data structure including second metadata, the first metadata corresponding to a set of micro-partitions, the second metadata for a grouping of the first metadata, the second data structure including information associating the second metadata to the first metadata. The subject technology stores the first data structure and the second data structure in storage as a first file and a second file. The subject technology stores third metadata for a table, the third metadata comprising: cumulative table metadata comprising global information about a plurality of micro-partitions of the table, the cumulative table metadata being stored in a metadata micro-partition associated with the table.

公开(公告)号：US10997212B2

公开(公告)日：2021-05-04

申请号：US17062859

申请日：2020-10-05

Applicant: Snowflake Inc.

Inventor： Ashish Motivala ,  Yi Fang ,  Martin Hentschel ,  Benoit Dageville ,  Spyridon Triantafyllis ,  Yizhi Zhu

IPC: G06F16/27 ,  G06F16/245 ,  G06F16/22

Abstract: The subject technology stores database data in a table, the table comprising a plurality of micro-partitions each having rows and columns. The subject technology stores metadata for the table in a data structure, the metadata comprising a first level of the data structure comprising a column expression property comprising information about data stored in a column of a micro-partition of the table, a micro-partition expression property comprising information about data stored in the micro-partition of the table, and a second level of the data structure comprising a grouping expression property comprising information about data stored in the micro-partition and one or more additional micro-partitions of the table.

公开(公告)号：US10977278B2

公开(公告)日：2021-04-13

申请号：US16283431

申请日：2019-02-22

Applicant: Snowflake Inc.

Inventor： Ashish Motivala ,  Yi Fang ,  Martin Hentschel ,  Benoit Dageville ,  Spyros Triantafyllis ,  Yizhi Zhu

IPC: G06F16/27 ,  G06F16/245 ,  G06F16/22

Abstract: Systems, methods, and devices for multiple level metadata organization in database systems. A system includes a plurality of shared storage devices collectively storing database data across a plurality of tables that each comprise one or more micro-partitions constituting immutable storage devices. The system includes a resource manager configured to manage the storage of database data stored in a table across one or more of the plurality of shared storage devices. The resource manager is configured to manage the storage of metadata for the table. The metadata includes a column expression property with information about data stored in a column, a micro-partition expression property with information about data stored in a micro-partition, a grouping expression property with information about data stored in two or more micro-partitions, and cumulative table metadata with global information about all micro-partitions of the table.

公开(公告)号：US20200301929A1

公开(公告)日：2020-09-24

申请号：US16863627

申请日：2020-04-30

Applicant: Snowflake Inc.

Inventor： Benoit Dageville ,  Yi Fang ,  Martin Hentschel ,  Ashish Motivala ,  Spyridon Triantafyllis ,  Yizhi Zhu

IPC: G06F16/2457 ,  G06F16/27 ,  G06F16/2455 ,  G06F16/22 ,  G06F16/2458

Abstract: The subject technology receives first metadata corresponding to a set of micro-partitions. The subject technology generates second metadata for a grouping of the first metadata. The subject technology generates a first data structure including the first metadata and a second data structure including the second metadata, the second data structure including information associating the second metadata to the first metadata. Further, the subject technology stores the first data structure and the second data structure in persistent storage as a first file and a second file.

公开(公告)号：US20200272637A1

公开(公告)日：2020-08-27

申请号：US16283431

申请日：2019-02-22

Applicant: Snowflake Inc.

Inventor： Ashish Motivala ,  Yi Fang ,  Martin Hentschel ,  Benoit Dageville ,  Spyros Triantafyllis ,  Yizhi Zhu

IPC: G06F16/27 ,  G06F16/245 ,  G06F16/22

Abstract: Systems, methods, and devices for multiple level metadata organization in database systems. A system includes a plurality of shared storage devices collectively storing database data across a plurality of tables that each comprise one or more micro-partitions constituting immutable storage devices. The system includes a resource manager configured to manage the storage of database data stored in a table across one or more of the plurality of shared storage devices. The resource manager is configured to manage the storage of metadata for the table. The metadata includes a column expression property with information about data stored in a column, a micro-partition expression property with information about data stored in a micro-partition, a grouping expression property with information about data stored in two or more micro-partitions, and cumulative table metadata with global information about all micro-partitions of the table.