How to fix the Oracle error ORA-04091: table string.string is mutating, trigger/function may not see it?

In this post, you’ll learn more about the Oracle ErrorORA-04091: table string.string is mutating, trigger/function may not see it with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-04091: table string.string is mutating, trigger/function may not see it

Reason for the Error ORA-04091: table string.string is mutating, trigger/function may not see it

A trigger (or a user defined plsql function that is referenced in this statement) attempted to look at (or modify) a table that was in the middle of being modified by the statement which fired it.

How to fix the Error ORA-04091: table string.string is mutating, trigger/function may not see it ?

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

Rewrite the trigger (or function) so it does not read that table.