Method, System, and Program for Merging Log Entries From Multiple Recovery Log Files
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United States of America Patent
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Issued Date -
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app pub date -
Jun 12, 2006
filing date -
Aug 12, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A globally unique transaction identifier for each transaction is recorded in log entries pursuant to a two-phase commit protocol, wherein multiple log entries in multiple database recovery logs that correspond to one transaction have a same globally unique transaction identifier. A causally ordered, ascending timestamp value is maintained in the log entries pursuant to the two-phase commit protocol. For each of the multiple database recovery logs, all the log entries related to a single transaction are marked identically with a mark unique to the single transaction in a given one of the database recovery logs. Global changes are identified for the single transaction from the log entries in the multiple database recovery logs based on the marking and the globally unique transaction identifier for each transaction by reading log entries based on the causally ordered, ascending timestamp value.
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