How to fix the Oracle error ORA-12738: Express Instant Client: unsupported client national character set string?

In this post, you’ll learn more about the Oracle ErrorORA-12738: Express Instant Client: unsupported client national character set string with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-12738: Express Instant Client: unsupported client national character set string

Reason for the Error ORA-12738: Express Instant Client: unsupported client national character set string

Only UTF8 and AL16UTF16 are allowed to be used as the national character set. Instant Client has only minimal character sets.

How to fix the Error ORA-12738: Express Instant Client: unsupported client national character set string ?

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

Do not use Express Instant Client for this character set