How do you resolve a mutating table error?
Fixing the mutating table error
- First, declare an array of customer record that includes customer id and credit limit.
- Second, collect affected rows into the array in the row-level trigger.
- Third, update each affected row in the statement-level trigger.
What is mutating trigger error in Oracle?
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.
How do you resolve table is mutating trigger function may not see it?
I had the same issue and I noticed that if you do a select on the same table you put the trigger on you may/will get this problem. You can remove FOR EACH ROW or use the data in :New to do the calculation (if possible) and then make the update.
What is a 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.
What is mutating table error in Oracle with example?
A mutating table error (ORA-04091) occurs when a row-level trigger tries to examine or change a table that is already undergoing change (via an INSERT, UPDATE, or DELETE statement). In particular, this error occurs when a row-level trigger attempts to read or write the table from which the trigger was fired.
Do you know what mutating table triggers?
What are the 5 global triggers in Report Builder?
We have five types of triggers in Oracle reports.
- Before Parameter form.
- After Parameter form.
- Before report.
- Between pages.
- After report.
What is mutating table error?
What is mutating error how do you avoid it?
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. Don’t use triggers – The best way to avoid the mutating table error is not to use triggers.
Can we use pragma Autonomous_transaction in trigger?
The trigger has pragma autonomous_transaction, and trigger works as intended.
Why do we use dynamic SQL?
Dynamic SQL enables you to write application code that is reusable because the code defines a process that is independent of the specific SQL statements used. In addition, dynamic SQL lets you execute SQL statements that are not supported in static SQL programs, such as data definition language (DDL) statements.
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. Don’t use triggers-The best way to avoid the mutating table error is not to use triggers.
What is mutating table error in Oracle 9i?
Mutating Tables. Each new release of the Oracle database reduces the impact of the mutating table error on triggers and they are much less of a problem with Oracle9i and above. If a trigger does result in a mutating table error, the only real option is to rewrite the trigger as a statement-level trigger.
How do I avoid mutating table errors?
Use an “after” or “instead of” trigger – If you must use a trigger, it’s best to avoid the mutating table error by using an “after” trigger, to avoid the currency issues associated with a mutating table. For example, using a trigger “:after update on xxx”, the original update has completed and the table will not be mutating.
What is a mutation table in trigger?
A mutation table is defined as a table that is changing. But in dealing with triggers, it is a table that has the possibility of changing. What this means to a trigger is that if the trigger reads a table, it can not change the table that it read from.