TNS_ADMIN Environment Variable in Oracle

I will explain TNS_ADMIN Environment Variable in Oracle in this post.


TNS_ADMIN in Oracle

TNS_ADMIN environment variable is very important in Oracle software that points to the directory where SQL*Net files like tnsnames.ora, sqlnet.ora and listener.ora.

TNS_ADMIN points to the $ORACLE_HOME/network/admin in Linux/Unix and %ORACLE HOME%\network\admin directory in Windows environment.


You can set it in Linux as follows.

export TNS_ADMIN=/u01/app/product/12.2.0/dbhome_1/network/admin


Or You can set it in Windows as follows.

set TNS_ADMIN=C:\app\oracle\product\12.2.0\dbhome_1\network\admin


TNS_ADMIN in Oracle Software Registry for Windows

You should run regedit to open a Registry Editor and then go to following directory.


You will find the TNS_ADMIN variable, if not exist or it is incorrect, you can edit it.




Do you want to learn Oracle Database for Beginners, then read the following articles.

About Mehmet Salih Deveci

I am Founder of SysDBASoft IT and IT Tutorial and Certified Expert about Oracle & SQL Server database, Goldengate, Exadata Machine, Oracle Database Appliance administrator with 10+years experience.I have OCA, OCP, OCE RAC Expert Certificates I have worked 100+ Banking, Insurance, Finance, Telco and etc. clients as a Consultant, Insource or Outsource.I have done 200+ Operations in this clients such as Exadata Installation & PoC & Migration & Upgrade, Oracle & SQL Server Database Upgrade, Oracle RAC Installation, SQL Server AlwaysOn Installation, Database Migration, Disaster Recovery, Backup Restore, Performance Tuning, Periodic Healthchecks.I have done 2000+ Table replication with Goldengate or SQL Server Replication tool for DWH Databases in many clients.If you need Oracle DBA, SQL Server DBA, APPS DBA,  Exadata, Goldengate, EBS Consultancy and Training you can send my email adress [email protected].-                                                                                                                                                                                                                                                 -Oracle DBA, SQL Server DBA, APPS DBA,  Exadata, Goldengate, EBS ve linux Danışmanlık ve Eğitim için  [email protected] a mail atabilirsiniz.

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