International Business Machines Corporation

Jeffrey James Goss

Catherine Suzanne McArthur

Matthew Albert Huras

Xun Xue

Jack Hon Wai Ng

Kaarel Truuvert

Michael Jeffrey Winer

Roger L Q Zheng

Hebert Walter Pereyra

William T O'Connell

Kevin Leo Beck

Dieu Quang La

Paul Michael Brett

Bruce Gilbert Lindsay

Keriley Kay Romanufa

Dale Murray McInnis

Miroslaw Adam Flasza

Nelson Hop Hing

Herbert Walter Pereyra

Sarah Posner

Lorysa M Meadowcroft

A database management system in which a plurality of nodes form a database instance, each node including a communication manager for dynamically configuring inter-nodal communication resources. The communication manager receives communication resource allocation requests from clients or a self-tuning algorithm. A resource self-tuning mechanism allocates or de-allocates memory blocks used for communication resource elements dynamically in real time without cycling the instance. Memory blocks are de-allocated asynchronously by placing associated communication resource elements in quarantine until all communication resource elements associated with the memory block are quarantined.

Dynamic configuration and self-tuning of inter-nodal communication resources in a database management system

A system and a method for the deferral and incremental performance of integrity processing for data rolled into a table of a data warehouse and for the deferral and incremental performance of maintenance on data rolled out of a table of the data warehouse while permitting general users online access to other data contained in the table. The rolled in and rolled out data are contained within specific data partitions of the table. Each data partition in the table has an associated distinguishable partition ID. Each data partition can also have associated attributes corresponding to containing rolled-in and rolled-out data respectively. Table operation mechanisms are arranged such that general users of the table do not access rolled in data in a partition for which integrity processing has not yet been performed and do not access rolled out data.

Online incremental deferred integrity processing and maintenance of rolled in and rolled out data

Dynamic configuration and self-tuning on inter-nodal communication resources in a database management system

A method and system for suspending log-based updates to a database in a manner that permits resumption of log-based updating without reinitializing the database. The method and system thereby permit efficient alternation between a log-based update mode and a database access mode. Unplayed log records are protected as revisions of database pages at the time that the log-based update was suspended. This approach permits log-based updating to resume at the same point at which log-based updating was suspended. In order to ensure consistent data for access while in database access mode, a roll-back procedure creates consistent data pages that are used for access and discarded when log-based update resumes.

Method and apparatus for interrupting updates to a database to provide read-only access

A system and method handle resource transaction requests. The system marks a waiting transaction request, having an access mode which is incompatible with the access mode of the executing transaction, with an ignore bit, so that a transaction request with an access mode compatible with the access mode of the executing transaction may receive a lock in order to access the resource. The transaction request is then marked with a bypass indicator such that when the executing transactions are finished accessing the resource, the waiting transaction request may be notified that it may have access to the resource. The system includes the ignore bit so that each transaction request that arrives after the ignore bit has been set, does not suffer from a long waiting time before being provided access to the resource.

System and method for handling resource transaction requests

A database table reorganization is defined to permit online access of the table during the reorganization. Records are reorganized in the database table by vacating records from a defined number of pages and then filling the pages with records in accordance with a desired ordering for the records. Temporary pointers to the new locations of moved records are used to prevent table scanner access to the database table from missing or duplicating records while scanning the database table during reorganization. Removal of the temporary pointers is synchronized with the completion of scanning of all table scanners that are commenced during a time when records are being moved as part of a vacating or filling step.

Online database table reorganization

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Toronto, Canada

Jeffrey James Goss