Use LAG EXTRACT to determine a true lag time between Extract and the data source. LAG EXTRACT calculates the lag time more precisely than INFO EXTRACT because it communicates with Extract directly, rather than reading a checkpoint position in the trail.

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.

If the heartbeat functionality is enabled, you can view the associated lags.

GGSCI Syntax

LAG EXTRACT 
[, group_name]
[, GLOBAL]

group_name

The name of an Extract group or a wildcard (*) to specify multiple groups. For example, T* determines lag time for all Extract groups whose names start with T.

GLOBAL

Displays the lags in the GG_LAGS view.

Examples

LAG EXTRACT *

LAG EXTRACT *ext*

The following is sample output for LAG EXTRACT.

Sending GETLAG request to EXTRACT CAPTPCC...
Last record lag: 2 seconds.
At EOF, no more records to process.