How to fix the Oracle error ORA-02327: cannot create index on expression with datatype string?

In this post, you’ll learn more about the Oracle ErrorORA-02327: cannot create index on expression with datatype string with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-02327: cannot create index on expression with datatype string

Reason for the Error ORA-02327: cannot create index on expression with datatype string

An attempt was made to create an index on a non-indexable expression.

How to fix the Error ORA-02327: cannot create index on expression with datatype string ?

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

Change the column datatype or do not create the index on an expression whose datatype is one of VARRAY, nested table, object, LOB, or REF.