Snowflake Inc.

Xuelai Cui

Jiaqi Yan

Nicola Dan Onose

Boyung Lee

Thierry Cruanes

Allison Waingold Lee

William H Waddington

Yongsik Yoon

Sangyong Hwang

Li Yan

Prashant Gaharwar

Vineet Garg

Kevin Ye Jie Li

Andrew Xue

The subject technology receives a query, the query including a statement for performing the query. The subject technology performs a first lookup operation on a multi-phase cache based on the query. The subject technology performs, in response to a first cache miss of the multi-phase cache, parsing of the statement from the query. The subject technology performs, based on the parsing, a compilation process on the query to generate a compiled query plan, the compilation process determining an optimization and a generalization for the query. The subject technology determines that the compiled query plan is cacheable. The subject technology registers, in response to the compiled query plan being cacheable, a dummy entry in the multi-phase cache.

Multi-phase query plan caching

The subject technology receives a query, the query including a set of statements for performing the query. The subject technology populates a compilation context based at least in part the query. The subject technology invokes a compiler to perform a compilation process based on the compilation context. The subject technology performs a lookup operation on a stored plan cache for an exact match based on information from the compilation context. The subject technology, in response to determining an exact match, determines whether the particular query plan requires re-compilation based on a data dependent optimization. The subject technology determines whether a plan cache entry corresponding to the particular query plan includes a data property constraint. The subject technology determines whether the data property constraint still holds based on a set of data properties.

Query plan cache in database systems

Caching query plans in database systems

The subject technology receives a query, the query including a set of statements for performing the query. The subject technology populates a compilation context based at least in part the query. The subject technology provides the compilation context to a compiler. The subject technology invokes the compiler to perform a compilation process based on the compilation context, the compilation process comprising performing a lookup operation on a stored plan cache for an exact match based on information from the compilation context, the stored plan cache including a set of stored query plans, and determining whether the exact match of a particular query plan is found in the stored plan cache to avoid compiling the query using the compilation context.

Query plan caching for networked database systems

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Seattle, WA, United States of America

Xuelai Cui