How to fix the Oracle error ORA-18003: an outline already exists with this signature?

In this post, you’ll learn more about the Oracle ErrorORA-18003: an outline already exists with this signature with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-18003: an outline already exists with this signature

Reason for the Error ORA-18003: an outline already exists with this signature

The signature generation algorithm generates signatures that are are 16 bytes in length so it is highly unlikely that any 2 signatures will be identical. This message is raised in such a rare case.

How to fix the Error ORA-18003: an outline already exists with this signature ?

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

Either re-issue the statement that led to the outline being created with some whitespace added or force the outline to be created in a different category.