System and apparatus to ensure a low-latency read of log records from a database management system (“DBMS”)
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United States of America Patent
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Feb 15, 2011
Grant Date -
Dec 3, 2009
app pub date -
May 28, 2008
filing date -
May 28, 2008
priority date (Note) -
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Abstract
A system and method to ensure a low-latency read of log records from a Database Management System (“DBMS”) in asynchronous log-based database replication capture from a blocking log read Application Programming Interface (“API”). The system may include a replication server with a log read module to initialize a log read thread. The reading module of the log read thread may read a predefined number of DBMS log records. A log flush module of the log flush thread may be executed by the log read thread and waits for a read complete notification. The update module, in response to a log flush thread time out, may also generate a plurality of loggable transactions such that a number of log records in an internal API log satisfies a DBMS threshold and unblocks the DBMS API. Therefore, the latency time may be constant, low, and predictable ensuring an accurate replication capture.
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