How to fix the Oracle error ORA-30357: this PL/SQL function cannot be supported for query rewrite?

In this post, you’ll learn more about the Oracle ErrorORA-30357: this PL/SQL function cannot be supported for query rewrite with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-30357: this PL/SQL function cannot be supported for query rewrite

Reason for the Error ORA-30357: this PL/SQL function cannot be supported for query rewrite

The statement referenced a PL/SQL function that is not marked DETERMINISTIC.

How to fix the Error ORA-30357: this PL/SQL function cannot be supported for query rewrite ?

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

Perform one of the following actions:

– Remove the use of the PL/SQL function.

– Mark the PL/SQL function as DETERMINISTIC.

– Disable the REWRITE option on the materialized view. The function should be marked DETERMINISTIC only if it always returns the same result value for any given set of input argument values, regardless of any database state or session state. Do not mark the function as DETERMINISTIC if it has any meaningful side-effects.