Checking Environment Variables
After the Oracle installation is complete, verify that the PATH environment variable includes the correct Oracle directory path.
For example:
Windows
For Oracle 12.1.0.2:
c:\oracle\12.1.0.2\dbhome_1\bin
UNIX
For Oracle 12.1.0.2:
/u01/app/oracle/product/11.2.0/dbhome_1/bin
When Oracle is installed, it typically places two Java Runtime Environments at the beginning of the PATH variable. This placement interferes with Windchill installers, which rely on the JDK. After installing Oracle, make sure that your 1.6.x JDK is positioned in your PATH variable before any JREs the Oracle installer may have added.