How exactly is the replication set and where extract and replicat are
located? I see an additional "rman" function in the "DR" side and it looks
like it is not present in Primary.
Also there is a difference in average active sessions (in "DR" looks 3
times higher), are you sure these numbers present the same workload?
În joi, 8 apr. 2021 la 21:05, Pap <oracle.developer35@xxxxxxxxx> a scris:
Thank you Tanel.
Its HP machine and its on file system. No ASM. The filesystemsio_options
in gv$paramer showing as "asynch" in both databases. and also
disk_asynch_io is also set as TRUE. As I see from AWR, Its HP-UX IA(64
bit), 64 core, 8- socket machine in both side.
The SAN team confirms not much visible difference between the underlying
storage performance between those two sites. So wondering as we don't use
data guards could this difference be just because of just the structural
difference in table/index structure? But we have all the same volume of
data on both sides so not sure how that can play such a big difference. And
contrary to that, I see we are doing more work on the Primary(faster) side
during that time period as compared to DR(slow side), so how is that
possible? I am seeing the direct write is higher on DR i.e. slow side as
compared to primary, not sure if that is pointing to something suspicious.
I have fetched the wait event section of the AWR from both databases and
attaching here(in two tabs as primary and DR wait profile). Although I do
see "free buffer waits" in one of the top lists but the major one is 'index
contention'(top one is a composite PK index but local index, so less
chances of structural difference causing such issues). But again it might
be that the DBWR response trend is just a symptom of something else but not
the cause as the SAN team is saying no difference there.
Regards
Pap
On Thu, Apr 8, 2021 at 10:34 PM Tanel Poder <tanel@xxxxxxxxxxxxxx> wrote:
There's also one usual suspect, I don't see *filesystemio_options*
parameter set, are you running on ASM, not a filesystem, right?
Thanks,
Tanel.
On Thu, Apr 8, 2021 at 4:06 AM 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.
