I also see a difference in the Avg DBWR response time during normal periods
i.e. 45ms vs 65 ms for primary and DR respectively. Does this mean that
it's not any parameter difference rather there must be some difference in
underlying storage/san?
On Thu, Apr 8, 2021 at 1:35 PM Pap <oracle.developer35@xxxxxxxxx> wrote:
Hello Lister, We have two databases which are the same in all the hardware
configurations along with DB parameters and are in sync/replicated using
golden gate. And those are treated as primary and DR for us and both are
active. But we are seeing differences in behaviour when our application
points to primary VS when it points to DR. We are seeing during specific
times of the day when our system is at its peak, in one of the database i.e
DR the DBWR response times spikes till ~200+ms slowing down the write
queries while in another database the dbwr response time stays ~65ms for a
similar amount of data and transaction volume. So wanted to understand what
can cause such drastic differences? Note- Its version 11.2.0.4 of Oracle.
I tried capturing a few key sections of AWR as during the peak time and
put it in the attachment in two different tabs. I am seeing the one having
a high DBWR response is doing lesser work as compared to the other one. So
wondering if it could be the difference in SAN? but As confirmed by the
infra team its solid state disk for both of the databases with no
difference in infra level. So wanted to understand , why do we see such
differences in both databases then?
Thanks and regards
Pap
