Distributed database using indexed into tags to tracks events according to type, update cache, create virtual update log on demand
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United States of America Patent
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Jul 13, 1999
Grant Date -
N/A
app pub date -
Oct 15, 1997
filing date -
Oct 15, 1997
priority date (Note) -
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status (Latency Note)
Importance
Abstract
Methods and systems are provided for synchronizing local copies of a distributed database, such as a master copy and a partial copy stored in a replica or in a cache. Each data item in the database has an associated timestamp or other tag. An index into the tags in maintained. The tag index may be used to create an event list to reduce the time and bandwidth needed to synchronize the local copies. The tag index may also be used to create a virtual update log, thereby removing the need to maintain one or more physical logs recording the history of the copies.
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