Oracle Enterprise Manager TNSPING Metric

Question

Hi All,
I wonder tns ping metric on OEM is actually representing data for TNSPING to database server from which server?
I'm not really mastering this topic, really appreciate your answer.
Thanks.
Regards,
Jolly

Answer 1

The listener "Response" metric evaluates "tnsPing" and "Status".  These metrics are evaluated by the agent, and it does this by running the script lsnrresp.pl which is located in:
<install location of agent>/plugins/oracle.sysman.db.agent.plugin_<latest plugin version>/scripts
eg. on my machine this is /oracle/12cagent/plugins/oracle.sysman.db.agent.plugin_12.1.0.2.0/scripts
ie. so  lsnrresp.pl is run on the machine where the agent/database/listener resides.
Although it's running on the local machine it is still making a tcp/ip connection  (ie. it's doing the equivalent of:-
tnsping "(ADDRESS=(PROTOCOL=TCP)(HOST=machine1.oracle.com)(PORT=1522))"
You can manually run this same tnsping command yourself from a database home of a remote machine (the machine where you're having difficulties from) and compare the difference.
Make sure that you use the same hostname and port when you run the tnsping command manually as EM is using.  You can find out which host and port EM is using by either checking:-
a) the targets.xml (from the machine where the listener is located) -
eg.
<Target TYPE="oracle_listener" NAME="LISTENER11203_machine1.uk.oracle.
com" DISPLAY_NAME="LISTENER11203_machine1.uk.oracle.com" ON_HOST="" EMD_URL="h
ttps://machine1.uk.oracle.com:3872/emd/main/" TIMEZONE_REGION="" IDENTIFIER="T
ARGET_GUID=881E917E1CE1D3BECC361599ACDAEEEB">
                <Property NAME="Machine" VALUE="machine1.uk.oracle.com"/>
                <Property NAME="Port" VALUE="1522"/>
                <Property NAME="LsnrName" VALUE="LISTENER11203"/>
                <Property NAME="ListenerOraDir" VALUE="/oracle/orabase/11203rdbms
/network/admin"/>
or
b) go to Enterprise Manager, go to targets/all targets.  Select your listener, click on it (will take you to the listener home page).
Then once on the listener home page, go to 'oracle listener' (drop down menu), pick "target setup"/"Monitoring Configuration"
It would be interesting to run the tnsping command manually from the problem machine (if you have a database home on that machine) and also to just do a 'general' ping from the problem machine to the database machine, and then do the same tnsping and ping command from the database machine itself and compare the difference.  It might also be useful to repeat this on both machines but using  ipaddress and see if you see any difference in the response time.  Also check that the hostname is resolving in the same way (eg. same dns etc.).  And to check whether any firewalls are involved.
HTH
Mani