Clients unable to connect due to the ORA - 12545 Intermittent in RAC environment

We deal with this problem.
Whenever we connect customer oracle application to our database server.
ounces it connect and the next moment, it shows the error ORA-12545: Connect failed because target host or object does not exist.

After searching on Google, I found many recommendations for this.
the one I like is:

+(source: Internet) +.

Whe LOCAL_LISTENER is nothing or is not set correctly, PMON can record the VIP host name and the physical hostname with the REMOTE_LISTENER. This is incorrect in the CARS, but if this happens, the client may intermittently be routed to an endpoint listens on one of these addresses. If the client cannot resolve the host name physical or even vip host name, the connection will fail with ORA-12545.
And first set is important to check the output for: lsnrctl services < nom_recepteur >
You should not see the physical hostname in the information manager for your RAC instances. Here is an example of a services of incorrect lsnrctl < nom_recepteur > output to a 2 node RAC cluster:
oracle_rac_listener lsnrctl services
Service 'oracle.oracle.com' has 2 occurrences.
'Orcl1' instance, State LOAN, has 2 managers of this service...
Managers:
"DEDICATED" set up: 0 denied: 0 status: ready
REMOTE SERVER
(ADDRESS = (PROTOCOL = TCP)(HOST=myphysicalhost1) (PORT = 1521))
"DEDICATED" set up: 326 refused: 0 status: ready
LOCAL SERVER

"Orcl2", State LOAN, has 1 operation for this service...
Managers:
"DEDICATED" implemented: 394371 refused: 0 status: ready
REMOTE SERVER
(ADDRESS = (PROTOCOL = TCP)(HOST=myphysicalhost2) (PORT = 1521))
Here's an example of what it should look like when LOCAL_LISTENER is configured correctly:
oracle_rac_listener lsnrctl services
Service 'oracle.oracle.com' has 2 occurrences.
'Orcl1' instance, State LOAN, has 2 managers of this service...
Managers:
"DEDICATED" set up: 0 denied: 0 status: ready
REMOTE SERVER
(ADDRESS = (PROTOCOL = TCP)(HOST=myVIP_host1) (PORT = 1521))
"DEDICATED" set up: 326 refused: 0 status: ready
LOCAL SERVER

"Orcl2", State LOAN, has 1 operation for this service...
Managers:
"DEDICATED" implemented: 394371 refused: 0 status: ready
REMOTE SERVER
(ADDRESS = (PROTOCOL = TCP)(HOST=myVIP_host2) (PORT = 1521))
Open a session with privileges to the instance and run the following commands so that LOCAL_LISTENER is correctly configured:
change the value system LOCAL_LISTENER = "(address = (protocol = tcp (host = < your_vip_node1 >))(port=1521)) range = the two sid ="INSTANCE_NAME1";"
Do the same for the 2nd instance where is set to < vip_host_node2 > and the sid is defined for the 2nd instance name.
change the value system LOCAL_LISTENER = "(address = (protocol = tcp (host = < your_vip_node2 >))(port=1521)) range = the two sid ="INSTANCE_NAME2";"
Now the correct address using the VIP host name is registered against the Auditors in the cluster.
The client must be able to resolve all forms of the VIP host through their file/etc/hosts. that is, short name and complete.

now my concern is:

To change the LOCAL_LISTENER parameter in the init.ora/spfile database, it will require a downtime? or it will have a negative impact on our existing RAC databases?
Please suggest?

Thank you

Hello

Good config is already present, then check/confirm below

1 tnsping , tnsping similarly & on nodes
2 sqlplus @/ , sqlplus @/ similarly through the node
3 Local_listener must not be empty it should point to the virtual host entry as below, try it before if everything fails

NAME                                 TYPE                             VALUE
------------------------------------ -------------------------------- ------------------------------
local_listener                       string                            (DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=121.244.255.54)(PORT=1522))))

Thank you
Ajay more
http://moreajays.blogspot.com

Tags: Database

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Thanks and greetings
Venkata Sainaba

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Check the paths of the library ($LIBPATH = $ORACLE_HOME/lib LD_LIBRARY_PATH = $ORACLE_HOM/lib: $ORACLE_HOME/lib32) and the compatibility parameter set to 11.1.0.0 and begin the upgrade. This should solve the problem.

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