Extra domain appended to service_name in EM

From: Yong Huang <yong321_at_yahoo.com>
Date: Wed, 2 Sep 2009 11:31:54 -0700 (PDT)
Message-ID: <829284.79569.qm_at_web80607.mail.mud.yahoo.com>

Background: We use Enterprise Manager Our company has two domains (say) old.com and new.com. For historical reason, we create application services like app.old.com, but the DB service created automatically is dbname.new.com.

Problem: Sometimes the graphs (e.g. Average Active Sessions) on the Databases | dbname | Performance page in EM stops moving. It seems to only happen to one RAC database ( When this happens, we usually go to Monitoring Configuration page, and usually the Service Name on that page shows an application-specific service (app.old.com) instead of what DBAs prefer to use (dbname.new.com). When that happens, we manually change it and click Next and Submit. I'm not sure if those two things are related. But the following is most likely related: When the graphs are frozen, if we go to Top Activity page, it throws error:

ORA-12514, TNS:listener does not currently know of service requested in connect descriptor The Connection descriptor used by the client was:

The problem is clearly the double domains in service_name. The preferred service is dbname.new.com although app.old.com works too, but app.old.com.new.com obviously is bad. We have never figured out under what condition this bad service name is used, causing OMS to be unable to connect to the target database. The workaround is to either restart EM agent on each of the RAC nodes or fix the Service Name on Monitoring Configuration page or both, and wait for one day or so (not sure exactly how long).

Has anybody had this problem? Where are the domain names stored in sysman (EM) repository if they're stored in there? We haven't touched sqlnet.ora or ldap.ora (we use LDAP to resolve names) on OMS for a long time and they're absolutely correct.

Yong Huang       

Received on Wed Sep 02 2009 - 13:31:54 CDT

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