I have a trigger on a table that has to do an action depending on certain values in the other rows and current row in the table. But I get an ORA-4091 error while doing this. How do I work around this?

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The ORA-4091 is the "mutating trigger" issue and is commonly resolved by abandoning the trigger approach and using a stored procedure instead.

Another option is to use a combination of a "before" trigger to set the context, a row-level trigger to capture the changes to each row, one at a time, and an "after" trigger to apply and commit the changes.

This was first published in October 2005

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