Query based invalidation subscription
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United States of America Patent
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Jun 14, 2011
Grant Date -
Mar 10, 2005
app pub date -
Jun 10, 2004
filing date -
Sep 4, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A query result set is an example of a type of body of data whose content is defined by a query. Modifications to a database can change the result of a query and therefore what the content of such a body of data, such as a result set, should be. Active Queries is an approach that enables a database server to detect database changes that alter the result of a query registered for a client and to notify a client of those changes. The notifications may be sent to, for example, a cache manager responsible for maintaining coherency of a result set cache generated by the query. The notification notifies the cache manager of when and/or what changes are needed to maintain the coherency of the cache.
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