How to fix the Oracle error TNS-12158: TNS:could not initialize parameter subsystem?

In this post, you’ll learn more about the Oracle ErrorTNS-12158: TNS:could not initialize parameter subsystem with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

TNS-12158: TNS:could not initialize parameter subsystem

Reason for the Error TNS-12158: TNS:could not initialize parameter subsystem

Cause: Unable to locate parameter file.

How to fix the Error TNS-12158: TNS:could not initialize parameter subsystem ?

You can fix this error in Oracle by following the below steps

Action: Verify that a valid parameter file exists, and is readable.