How to fix the Oracle error ORA-24406: API mode switch is disallowed when a call is in progress.?

In this post, you’ll learn more about the Oracle ErrorORA-24406: API mode switch is disallowed when a call is in progress. with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-24406: API mode switch is disallowed when a call is in progress.

Reason for the Error ORA-24406: API mode switch is disallowed when a call is in progress.

A mode switch from OCI8 to OCI7 was attempted in a callback.

How to fix the Error ORA-24406: API mode switch is disallowed when a call is in progress. ?

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

The user should perform the API mode switch either prior to initiating the top call or after the main call is done.