Unisys Corporation

James R Mettling

Ralph E Sipple

Thomas P Cooper

John R Jordan

Ronald Q Smith

James A Elke

Lester Y Lee

James M Plasek

Lee-Chin Hsu Liu

Jennifer J Smith

Rajeev P Tandon

Michael J Bierma

Katsuhiko Kihara

Sheng-te Chiang

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

A system for parallel reading and processing of a file. The system includes multiple disks for storing the file. The disks are coupled to a data processing system via multiple input-output channels. A file buffer is established in the memory of the data processing system, wherein the file buffer is shared by an instruction processor that initiates a parallel read request and manipulates the file data once it is read, and multiple input-output processors that are coupled to the input-output channels. Multiple input requests are issued to the multiple disks to be processed in parallel. The input-output processors write file data to a first portion of the file buffer in parallel with the reading of a second portion of the file buffer by the instruction processor. Control structures provide a means for control over the input processing demands that the parallel read request is allowed to place on the system.

System for parallel reading and processing of a file

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Forest Lake, MN, United States of America

James R Mettling