There are various pieces to monitor lag. Is this physical,Logical or Active Dataguard. I always point people to the Nice Dataguard menu designed by the folks that wrote the book Dataguard 11g book here http://www.dataguardbook.com/Downloads/dgmenu/?C=S;O=D The dg_menu is written for Oracle 11 and covers all aspects. Grid Control has fairly externsive alerting on lag also ________________________________ From: Howard Latham <howard.latham@xxxxxxxxx> To: ORACLE-L <oracle-l@xxxxxxxxxxxxx> Sent: Tue, October 5, 2010 8:09:38 AM Subject: Dataguard Monitoring Anyone point me in the right direction for an 11g Linux Script to monitor Dataguard lag? I have googled and looked on oracle Support. -- Howard A. Latham Sent from my Nokia N97