Oracle Mutating Table Problem (Doc ID 37906.1)

Last updated on AUGUST 28, 2017

Applies to:

PL/SQL - Version 8.1.7.4 and later
Information in this document applies to any platform.
***Checked for relevance on 24th Aug 2017***

Goal

The mutating trigger error (ORA-04091) is a pretty common problem in Oracle that happens and frustrates many application developers and DBAs as the application developers bug them to find a solution. It happens when a trigger on a table tries to insert, update, or even select from the same table of whose trigger is being executed. Sometimes the inability to see the table causes standstill in the development. This note and the associated scripts attempt to present just one work-around for the problem. The work around may not be the best but rather does show that a work-around is possible and provides a solution that will be applicable in most cases. The approach is described by a case study.

Solution

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