International Business Machines Corporation

Kathy A McKnight

David C Sharpe

Daniel Costante Zilio

Paul C Huffman

Michael Jeffrey Winer

Roger Luo Q Zheng

Catharina K Wong

A query processing system has a query processor and a data manager. The query processor calls the data manager to carry out data access for a query including a filtering operation. The data manager accesses the data in a set of data and before returning the data, initiates a callback to the query processor to determine if the located data meets the filtering criteria. Where the data does not satisfy the filtering criteria, the data manager seeks additional data in the set of data, without having to return the first located data to the query processor.

Execution of database queries including filtering

A lock control data structure for a unit of work of an application program. The unit of work has a set of threads of access for opening a set of objects accessible to the application program. The lock control data structure has a set of object-specific lock models corresponding to the set of objects, and a lock controller for locking each object in the set of objects. Information regarding the lock requirements for each object are stored in the corresponding object-specific lock model. The lock controller locks and unlocks each object in the set of objects based on the information stored in the corresponding object-specific lock model.

Method and system for improving concurrency through early release of unnecessary locks

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Sharon, Canada

Kathy A McKnight