How to fix the Oracle error ORA-19646: cannot change size of datafile string from string to string?

In this post, you’ll learn more about the Oracle ErrorORA-19646: cannot change size of datafile string from string to string with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-19646: cannot change size of datafile string from string to string

Reason for the Error ORA-19646: cannot change size of datafile string from string to string

Restore needs to adjust the size of the file as indicated, but the file size adjustment failed.

How to fix the Error ORA-19646: cannot change size of datafile string from string to string ?

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

Examine the other messages which should be present to indicate the cause of the failure.