During the connection to the Oracle Database server with the
sqlplus we may get an error with the ORA-12162 specifier. This error will prevent to connect to the Oracle Database Server.
“ORA-12162: TNS:net service name is incorrectly specified” Error
This error will be look like below. This error is caused by not setting $ORACLE_HOME and $ORACLE_SID environment variables for Linux and Windows Operating systems.
Check $ORACLE_HOME Environment Variable
$ORACLE_HOME is important operating system variable used by Oracle Database. First we will check whether it is set or set properly with the
echo command like below in Linux.
$ echo $ORACLE_HOME
For windows we can list environment variables with
Set $ORACLE_HOME Environment Variable in Windows and Linux
We will set
$ORACLE_HOME environment variable. This will be used by related tools. We can set environment variable for Linux with export command like below.
$ export ORACLE_HOME="/home/oracle"
We can make this environment variable persistent between boots by adding this line to the
.bashrc file of the user.
We can use following tutorial to add ORACLE_HOME environment variable by using following tutorial in Windows operating system.
How To List, Set, Get Windows Environment Variables With Set Command In Command Line MS-DOS?
Check $ORACLE_SID Environment Variable
We will check
$ORACLE_SID environment variable which also requires to solve error. We will use
echo command again.
$ echo $ORACLE_SID
Set $ORACLE_SID Environment Variable in Linux
Now the final step is setting
$ORACLE_SID in Linux environment. This will be used by
sqlplus to use as Oracle SID while connecting. In this case we will set
XE as SID.
$ export ORACLE_SID="XE"
We can make this permanent by adding
.bashrc of the user like below.
$ echo "export ORACLE_SID" >> ~/.bashrc