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I am not guru but Ic an try to help
Answer 1) You do not have to disable 10g grid. You can run both 10g and 12c parallel. But both agents needs to listen to different ports. They cannot listen on same ports. Your deployment will have if you give same 10g port for 12c agent.
Answer 2 , 3) Read this doc in metalink, this might help
How to Configure the OMS Connect String when Repository is in a Dataguard setup (Doc ID 1328768.1)
Regarding your query on how to switchover your primary OMS from standby you can refer to
Performing Switchover and Failover Operations
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The procedure for creating a standby OMS differs according to the version of Enterprise Manager.
184.108.40.206 and earlier - Standby OMSs using Standby WebLogic Domain.
220.127.116.11 and later - Standby OMSs using Storage Replication.
For information on EMCC log location go through
EM 12c Cloud Control: Steps to Locate and Manage the Various Logs/Trace files in a 12c OMS Installation (Doc ID 1448308.1)
Thank you, guys. I will troubleshooting it now and will provide updates soon.
You will miss 10g gridcontrol. 12c is painfully slow even after fiddling around with it. I went back to 11g after failing to get it to perform on par with it.
is it true? what is the latest version of 12c now? I wonder if I upgrade it to the newest version, it will be better?
I also would like to know is: if I log into 12c cloud control, can I check which host is this is located?
Yes, you can log in to 12c cloud control
Click Targets > All Targets > Management Services and Repository
Find the hostname in Management Service in use
Thanks. I found the host name and logged in. and somehow it is surprising to find out that there is no instance on the box.
Is this normal behavior?
ps -ef|grep pmon shows nothing, /etc/oratab shows nothing.
under /u01, I only see oms home and agent home, no dbhome.
I am just puzzled here. since I am new to this environment. I would like gurus here help me
You can have the OMS + database on one server or the db on a server and OMS on an other server or even more servers.
I your case you have 1 dedicated db server and a dedicated OMS server.
That consulting company did not leave much documentation, did they?
NO documentation, no nothing. I only heard there is one primary , one standby. RIght now the weblink points to the standby. The primary is under construction.
so the instance got to be on the standby now. How do I check then?
If you're using additional OMS then that machine contain only OMS+Agent where in you have repository database resides on either different host or in primary OMS machine. For Example, in your primary OMS machine would have OMS+Agent+DB
If you have Standby OMS then probably you will have Standby repository database configured with DG (Data Guard).
Thanks again. You have been so helpful. I would like know how do I find out if it is oms+agent only on standby?