About Lag
For Extract, lag is the difference, in seconds, between the time that a record was processed by Extract (based on the system clock) and the timestamp of that record in the data source.
For Replicat, lag is the difference, in seconds, between the time that the last record was processed by Replicat (based on the system clock) and the timestamp of the record in the trail.
To view lag statistics, use either the LAG or SEND command in GGSCI. For more information, see Parameters and Functions Reference
for Oracle GoldenGate.
Note:
The INFO command also returns a lag statistic, but this statistic is taken from the last record that was checkpointed, not the current record that is being processed. It is less accurate than LAG or INFO.