On Wed, Nov 23, 2011 at 6:32 PM, kapil vaish <kapilvaish1@xxxxxxxxx> wrote: > Thanks for all the answers, awesome team. Here are some answers to your > questions . > Manual means thru scripts only, this is not Dataguard . There is no issue in > shipping time, we hae plenty archived logs available on the standby server to > apply. The lag becomes 30-40 hours in 3-4 days and will continue to grow . > This DR is used for multiple purposes and we can not afford this much lag . > This is 3 node RAC BTW. > What we are trying to figure out is that if it is limitation of Oracle and it > can not get any better or some other tunings can be checked. We are > continously working with our storage/hw teams to take care of any contentions > . > Hi, Why you are not using DataGuard ? in that case you can use real time apply and it can work better than applying archive logs. From other side - did you ever try to check why standby is performing poor ? you can use v$system/session_event and try to figure out where Oracle is loosing time. It can be issue with applying logs but it can be issue with DBWR doing checkpoint as well. I have seen case where MRP was able to apply log in 20 s but checkpoint took 40 s. regards, -- Marcin Przepiorowski http://oracleprof.blogspot.com -- //www.freelists.org/webpage/oracle-l