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Don Burleson Blog 







Data Guard Physical Standby Time Lag

Oracle Database Tips by Donald BurlesonDecember 9, 2015


Oracle Data Guard:  Physical Standby Databases with Time Lag

Oracle Data Guard provides functionality to manage the time lag between delivery of the archived log file on the standby site and the application of these archived logs. In essence, it builds a delay between the log transfer and the log apply service on the physical standby database.

To configure a physical Oracle instance with time lag, nothing has to be changed on the physical standby database; instead, the initialization parameter of the primary database will have to be altered. On the primary site, change the log_archive_dest_n parameter to include the DELAY attribute.

The following example will put a delay of 60 minutes between the log transfer and the log apply services on the physical Oracle instance identified as appsdbstdby:


The timer starts on the Oracle instance after the archived log is received by the standby site.

The above text is an excerpt from the book: Oracle Data Guard Handbook

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