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How can mutating error be resolved?
If a trigger does result in a mutating table error, the only real option is to rewrite the trigger as a statement-level trigger. Mutating table errors only impact row level triggers. But to use a statement level trigger, some data may need to be preserved from each row, to be used by the statement level trigger.
What is the mutating table?
A mutating table is a table that is currently being modified by an UPDATE, DELETE, or INSERT statement, or it is a table that might need to be updated by the effects of a declarative DELETE CASCADE referential integrity constraint.
How can you retrieve the error code and error message of an Oracle server exception?
Retrieving the Error Code and Error Message: SQLCODE and SQLERRM. In an exception handler, you can use the built-in functions SQLCODE and SQLERRM to find out which error occurred and to get the associated error message. For internal exceptions, SQLCODE returns the number of the Oracle error.
Is there a way to avoid the mutating table error?
Don’t use triggers – The best way to avoid the mutating table error is not to use triggers. While the object-oriented Oracle provides “methods” that are associated with tables, most savvy PL/SQL developers avoid triggers unless absolutely necessary.
Can a statement Level trigger be used on a mutating table?
If a trigger does result in a mutating table error, the only real option is to rewrite the trigger as a statement-level trigger. Mutating table errors only impact row level triggers. But to use a statement level trigger, some data may need to be preserved from each row, to be used by the statement level trigger.
When does the Oracle mutating trigger error occur?
The Oracle mutating trigger error occurs when a trigger references the table that owns the trigger, resulting in the “ORA-04091: table name is mutating, trigger/function may not see it.” message.
Why does session run into mutating table error?
As you can see it works fine with Statement Level Trigger. With ‘For Each Row’, session cannot query the same table. This restriction applies to all row level triggers and hence we run into mutating table error. Make the transaction independent using PRAGMA AUTONOMOUS TRANSACTION.