Goldengate replicat waiting for commit

Scenario: Replicat is struck on database and have around 17 hour lag, it is outage on our environment :) & data is out of sync. 

REPLICAT    RUNNING     RWTEMP        0:42:30      17:34:02

On Initial investigation 
Check for blocking sessions on  oracle database 
Check for long running transaction on oracle database

Check for Replicat is moving on the trail using "info processname" command 
Check Trail is healthy using log dump utility

check for abended process ( extract or pump ) associated with the replicat 

performed all steps during initial investigation, I found pump which is writing to target server is abended and after when i started this pump, lag is cleared on the replicat 

Finally concluded, if there is any opened transaction on the replicat, replicat is waiting for commit, which created lag on the replicat 

How to check open transaction on oracle database? 

SQL> SELECT COUNT(*) FROM v$transaction t, v$session s, v$mystat m WHERE t.ses_addr = s.saddr AND s.sid = m.sid AND ROWNUM = 1;

----Nikhil Tatineni---
----Oracle in memory----