Unisys Corporation

Sheng-te Chiang

James M Plasek

Ralph E Sipple

Thomas P Cooper

Lee-Chin Hsu Liu

John R Jordan

Jennifer J Smith

Ronald Q Smith

Rajeev P Tandon

James A Elke

Lester Y Lee

James R Mettling

Michael J Bierma

Katsuhiko Kihara

A system for concurrent processing of queries and transactions against a shared database. The system includes multiple processors wherein a processor is available for processing queries and another processor is available for concurrently processing transactions. A query buffer is established for performing the query search while the data accessed by transactions is available in a database cache. Control logic in a database management system distinguishes between transactions and queries and initiates file-read control for reading the file containing the database. File-read control contains logic for logical sequential reading and logical non-sequential reading of the file. Control structures provide a means for control over the load that the query is allowed to place on the system.

System for optimally processing a transaction and a query to the same

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Circle Pines, MN, United States of America

Sheng-te Chiang