Oracle PL/SQL – INSTEAD OF Trigger example
Fix Oracle mutating trigger table errors Oracle Database Tips by Donald Burleson 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, oracle sql trigger referencing can not change the table that it read from. This can also happen when a trigger on a parent table causes an insert oracle sql trigger referencing a child table referencing a foreign key. Mutating Tables Each new release of the Oracle database reduces the impact of the mutating table error on triggers and they are much lancaster population demographics of a problem with Oracle9i and above.
referencing old and new in triggersA database event is a delete, insert, or update operation. For example, if you define a trigger for a delete on a particular table, the trigger's action occurs whenever someone deletes a row or rows from the table. Along with constraints, triggers can help enforce data integrity rules with actions such as cascading deletes or updates. Triggers can also perform a variety of functions such as issuing alerts, updating other tables, sending e-mail, and other useful actions. You can define any number of triggers for a single table, including multiple triggers on the same table for the same event.
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