How to fix the Oracle error ORA-30755: error during expansion of view hierarchy?

In this post, you’ll learn more about the Oracle ErrorORA-30755: error during expansion of view hierarchy with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-30755: error during expansion of view hierarchy

Reason for the Error ORA-30755: error during expansion of view hierarchy

There was an error while trying to expand a view hierarchy. This could be due to invalid subviews (or subviews with errors)

How to fix the Error ORA-30755: error during expansion of view hierarchy ?

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

Ensure that all subviews are valid e.g. alter view … compile and retry the operation.