Teradata Us, Inc.

Sanjib Kumar Mishra

Rama Krishna Korlapati

Paul Laurence Sinclair

Mohammed Yassin Al-Kateb

Vivek Kumar

Tri Minh Tran

Yi Xia

Kishore Chilagani

Naveen Jaiswal

Bin Cao

Chengyang Zhang

In some examples, a database system identifies a plurality of query portions in a database query that contain references to a first external table, the first external table being based on data from a remote data store coupled to the database system over a network. The database system creates a common spool portion that includes projections and selections of the plurality of query portions, and rewrites the plurality of query portions into rewritten query portions that refer to a spool containing an output of the common spool portion. For execution of the database query, the database system determines, as part of optimizer planning, whether to use the plurality of query portions or the common spool portion and the rewritten query portions.

Database query processing for data in a remote data store

Techniques for improving complex database queries are provided. A determination is made whether to adopt a static or dynamic query execution plan for a received database query based on metrics. When a dynamic query execution plan is adopted, the database query is separated into query fragments. A plan fragment is generated for each query fragment and executed to generate feedback for the plan fragment. The feedback from the execution of each plan fragment is used to initiate query rewrite rules to simplify the corresponding query fragments. The rewritten query fragments are combined to generate the dynamic query plan.

Incremental simplification and optimization of complex queries using dynamic result feedback

Disclosed are systems and methods for dynamic joining of database tables. The systems and methods can include: selecting a first table from a plurality of tables; selecting a second table from the plurality of tables; joining the first table and the second table to create a temporary table; and storing, in a memory of a computing device, the temporary table and the temporary skew value. The first table can have a first skew value. The second table can have a second skew value. The second skew value can be similar to the first skew value. The temporary table can have a temporary skew value.

Dynamic joining of database tables

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Telengana, India

Sanjib Kumar Mishra