International Business Machines Corporation

Tom K Chan

Robert J Catino

A multi-user system for managing a database, and comprising a file access processor and a plurality of application support processors. The file access processor is provided to access the database, and the support processors are connected to the file access processor to read and update data objects in the database. The file access processor includes a locking system to lock data objects for selected support processors to limit access to locked data objects by the other support processors. This locking system includes an implicit locking subsystem to place implicit locks on data objects automatically in response to receiving processing requests from the support processors, and an explicit locking subsystem to place explicit locks on data objects in response to receiving explicit locking requests from the support processors. The explicit locks are integrated into the locking scheme in a manner minimizing lock conflicts.

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Thornhill, Canada

Tom K Chan