06026413 is referenced by 223 patents and cites 32 patents.

A determination can be made of how changes to underlying data affect the value of objects. Examples of applications include: caching dynamic Web pages; client-server applications whereby a server sending objects (which are changing all the time) to multiple clients can track which versions are sent to which clients and how obsolete the versions are; and any situation where it is necessary to maintain and uniquely identify several versions of objects, update obsolete objects, quantitatively assess how different two versions of the same object are, and/or maintain consistency among a set of objects. A directed graph, called an object dependence graph, may be used to represent the data dependencies between objects. Another aspect is constructing and maintaining objects to associate changes in remote data with cached objects. If data in a remote data source changes, database change notifications are used to "trigger" a dynamic rebuild of associated objects. Thus, obsolete objects can be dynamically replaced with fresh objects. The objects can be complex objects, such as dynamic Web pages or compound-complex objects, and the data can be underlying data in a database. The update can include either: storing a new version of the object in the cache; or deleting an object from the cache. Caches on multiple servers can also be synchronized with the data in a single common database. Updated information, whether new pages or delete orders, can be broadcast to a set of server nodes, permitting many systems to simultaneously benefit from the advantages of prefetching and providing a high degree of scaleability.

Title
Determining how changes to underlying data affect cached objects
Application Number
8/905114
Publication Number
6026413
Application Date
August 1, 1997
Publication Date
February 15, 2000
Inventor
Gerald A Spivak
Mohegan Lake
NY, US
Arun K Iyengar
Yorktown Heights
NY, US
Paul Michael Dantzig
Scarsdale
NY, US
James Robert Harold Challenger
Garrison
NY, US
Agent
Kevin M Jordan
Assignee
International Business Machines Corporation
NY, US
IPC
G06F 17/30
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