Log Retention Requirements per Extract Recovery Mode

The following summarizes the different recovery modes that Extract might use and their log-retention requirements:

• By default, the Bounded Recovery mode is in effect, and Extract requires access to the logs only as far back as twice the Bounded Recovery interval that is set with the BR parameter. This interval is an integral multiple of the standard Extract checkpoint interval, as controlled by the CHECKPOINTSECS parameter. These two parameters control the Oracle GoldenGate Bounded Recovery feature, which ensures that Extract can recover in-memory captured data after a failure, no matter how old the oldest open transaction was at the time of failure. For more information about Bounded Recovery, see Reference for Oracle GoldenGate.

• In the unlikely event that the Bounded Recovery mechanism fails when Extract attempts a recovery, Extract reverts to normal recovery mode and must have access to the archived log that contains the beginning of the oldest open transaction in memory at the time of failure and all logs thereafter.