How to fix the Oracle error ORA-48172: unable to find a valid ADR base?

In this post, you’ll learn more about the Oracle ErrorORA-48172: unable to find a valid ADR base with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-48172: unable to find a valid ADR base

Reason for the Error ORA-48172: unable to find a valid ADR base

Unable to find a valid ADR base. We tried the ORACLE_BASE, ORACLE_HOME, home, and tmp directories, but none of the directories exist for read/write access.

How to fix the Error ORA-48172: unable to find a valid ADR base ?

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

Check the validity of the ORACLE_BASE, ORACLE_HOME, home, and tmp directories.