In this post, you’ll learn more about the Oracle ErrorORA-39285: Cannot alter index key compression. with the details on why you receive this error and the possible solution to fix it.
Oracle Error Description
ORA-39285: Cannot alter index key compression.
Reason for the Error ORA-39285: Cannot alter index key compression.
DBMS_METADATA_DIFF was comparing two indexes with different values of key compression. There is no SQL ALTER statement to change index key compression.
How to fix the Error ORA-39285: Cannot alter index key compression. ?
You can fix this error in Oracle by following the below steps
The difference cannot be eliminated with an SQL ALTER statement.