Clustered query support for a database query engine

Details Clustered query support for a database query engine Clustered query support for a database query engine

2006-12-22

2010-11-30

Rones, Charles (Department: 2164)

Data processing: database and file management or data structures

Database and file access

Preparing data for information retrieval

C707S800000

Reexamination Certificate

active

07844608

ABSTRACT:
A device, system, and method are directed towards combining a plurality of queries to a database into a combined execution plan. The plurality of queries is received. The queries may be Structured Query Language (SQL) statements. The database may be a relational database. The plurality of queries is transformed into a plurality of parse trees. A determination is made whether the plurality of queries operates on at least the same portion of the same table. If so, then the plurality of query trees is query-optimized. The plurality of query trees are combined into a master query tree based on similar nodes in the plurality of query trees. A split node in the master query tree represents non-similarities between the plurality of query trees. The master query tree is transformed into an execution plan. The execution plan is applied to a database to return at least one result.

REFERENCES:
patent: 6848078 (2005-01-01), Birsan et al.
patent: 2005/0071349 (2005-03-01), Jordan et al.
patent: 2008/0114803 (2008-05-01), Chinchwadkar et al.

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