Snowflake Inc.

Joshua Slocum

Cristian Diaconu

Chen Luo

Mihir Dharamshi

Wumengjian Zhu

Corbin McElhanney

Andrew McCormick

Evan J Tschannen

The subject technology receives, by an execution node, blob metadata from a key-value store, the blob metadata including information related to a set of blob files. The subject technology determines, by the execution node using the blob metadata, whether a copy of each of the set of blob files is stored in a local cache of the execution node. The subject technology transforms at least one blob file, retrieved from a blob store, to a second file in a column file format, the at least one blob file being in a first format that is different than the column file format, the transforming comprising at least converting a particular snapshot file from the at least one blob file to a particular set of rowsets and writing the set of rowsets into the second file in the column file format. The subject technology stores the second file in the local cache.

Columnar cache in hybrid transactional/analytical processing (HTAP) workloads

A distributed database system can include transactional database and an object storage database. The data of the transactional database can be split into granules and replicated to the object storage database. The distributed database system can process transactional requests using the transactional database. The distributed database can receive a request that reads data more than a set size from the transactional database. The distributed database system can identify the granule data in the object storage database and transmit data to complete the read on one or more of a plurality of execution nodes.

Database processing using hybrid key-value tables

The subject technology receives a query, the query including a query range for processing the query and a set of requested columns. The subject technology based on the query range, determining a set of blob files and a set of delete vectors. The subject technology for each blob file, storing each row, including the set of request columns, into an array of rowsets. The subject technology for each rowset, generating a delete bitset to at least indicate whether each row has been deleted. The subject technology for each delta file, indicate a previous row of a visible row of the delta file as being deleted based on a delete pointer of the visible row. The subject technology providing a set of rowsets, including a corresponding selection column set, as a result of the query.

Scan-based merge for analytical query processing in HTAP systems using delete vectors

The subject technology receives a query, the query including a query range for processing the query. The subject technology sends a request to a key-value store for blob metadata and a set of recent writes for the query range. The subject technology receives the blob metadata, the blob metadata including information related to a set of blob files. The subject technology determines whether the set of blob files is stored in a local cache. The subject technology, in response to at least one blob file being missing from the set of blob files, sends a request to a blob store to retrieve the at least one blob file of the set of blob files. The subject technology transforms the retrieved at least one blob file to a column file format. The subject technology stores the transformed at least one blob file in the local cache.

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Austin, TX, United States of America

Joshua Slocum