I was reading about goldengate and how supplemental logging is being used
http://www.juliandyke.com/Research/GoldenGate/GoldenGateSupplementalLogging.php
"Supplemental logging generates additional undo which is stored in the redo log. The additional information allows rows to be located when the ROWID is unavailable.
Undo is used because we want to locate the row in the target database in order to apply the change. The change may update columns in the target database
so we cannot use any values in the redo. This is required for logical standby databases
for example."
Undo is used because we want to locate the row in the target database in order to apply the change.
The additional information allows rows to be located when the ROWID is unavailable.
How does it work? Please explain in detail.Golden Gate Director.Oracle Golden Gate