System and method for providing a backup copy of a database
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United States of America Patent
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Jan 14, 1997
Issued Date -
N/A
app pub date -
Mar 22, 1995
filing date -
Dec 2, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A backup method for a computer database system comprising maintaining a mirrored copy of the database at a remote location is characterized in that updates to the remote database data are delayed for a delay time greater than or equal to the upper limit on the data communication delay between the local location and the remote location and updates to a remote log for the database are executed after corresponding updates to a local log without said delay. In this way a consistent copy of the database may be recovered from the mirrored copy of the database and the remote log after destruction of the database system.
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