In Q replication, an approximate measure of how current a Q Capture program is in reading the DB2 database recovery log. It is the approximate difference between the time that source data was changed and the time that the Capture program made the data available by committing it to WebSphere MQSeries. This is a subset of the end-to-end latency in a replication scenario. See also latency, Apply latency, Capture latency, Q Apply latency, queue latency, end-to-end latency.