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TNS and LISTENER Configuration in oracle

TNS-Transparent network substrate.
  • The transparent network substrate a proprietary oracle computer networkin technology,supports homogeneous peer-to-peer connectivity on top of other  networking technologies such as  tcp/ip and named pipes.
  • Tns operates mainly for connection to oracle databases.
  • Which is the responsible of connecctions establishment.

Step1:- To click the local net service name configuration and click next button.
Step2:-To  click the add and click next button.
Step3:-To add service name  and click next button.
Step4:-To  click the tcp  and click next button.
Step5:-To add  host name and click next button.
Step6:-To click the no  and click next button.
Step7:-To add net service name and click next button.
Step8:-To click the no and click the next button.
Step 9:-to click the finish button.

then check the information  os  level.
[oracle@nijam]$cd $ORACLE_HOME/network/admin/
[oracle@nijam admin]$vi tnsname.ora
#tnsnames.ora network  configuration file:/u01/app/oracle/product/11.2.0/db_1/network/admin/tnsnames.ora
#generated by oracle configuration tools.
Save  the file.

[oracle@nijam admin]$tnsping nijam
[oracle@nijam]$ps –ef|grep –i tns

  • The oracle database listener is the server process that provides basic network connectivity for clients,application servers,and other databases to an oracle databases.
  • In addition to  database ,the listener can also be configured to  support  binary executables.
  • The listener listens on a  specific network port(default 1521) and forwards  network connections to the database.
  • The listener configuration,  stored in the listener.ora  file.

Step1:-To click the listener  configuration  and click next button.
Step2:-To click the  add and click the next button
Step3:-To add listener name and click next button
Step4:-To click the tcp and click next button.
Step5:-To click the no and next button.
Step6:-To click the finish button.

[oracle@nijam]$cd $ORACLE_HOME/network/admin/
[oracle@nijam admin]$vi listener.ora
Then save the file.

[oracle@nijam admin]$lsnrctl
Lsnctl>start    --->a starts the listener with the name specified.will be used.
Lsnrctl>stop   --->a stop the listener.
Lsnrctl>status --->information about the listener.
Lsnrctl>reload --->a forces a read of the configuration file in orderfor new settings to take effect without stopping and starting the listener.
Lsnrctl>exit --->a the lsnrctl utility.

check whether port is available or not.
[oracle@nijam]$netstat  -tunlp|grep 1521.

TNS_ADMIN is an environment variable that points to the directory where the SQL*Net configuration files (like sqlnet.ora and tnsnames.ora) are located.

set TNS_ADMIN=%ORACLE HOME%\network\admin

Unix/ Linux:
export TNS_ADMIN=$ORACLE HOME/network/admin


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