Only committed triggers are fired. A loop-back database link makes a local table appear remote by defining an Oracle Net path back to the database that contains the link. Can only be defined over nested table columns in views. An attempt is made to validate the trigger on occurrence of the event. Do not use loop-back database links to circumvent the trigger restrictions. The new column values are referenced using the new qualifier before the column name, while the old column values are referenced using the old qualifier before the column name. Foreign Function Callouts All restrictions on foreign function callouts also apply. Type checking and further processing on the parse tree. The parent row corresponding to this nested table element can be accessed using the parent qualifier. In other words, one must use just "tablename" not "database. The statement level triggers are useful for performing validation checks for the entire statement. For non-TEMP triggers, the table to be modified or queried must exist in the same database as the table or view to which the trigger is attached.
Statements inside a trigger can reference remote schema objects. The row correlation variables inside the trigger correspond to the nested table element. For example, if you execute the following SQL statement: This handles portability issues between stored and non-stored trigger releases. If the statement that caused the trigger program to execute is itself part of a trigger program, then that trigger program resumes execution at the beginning of the next step. The statements in the trigger body operate under the privilege domain of the trigger's owner, not the privilege domain of the user issuing the triggering statement. An object it references is not available. The OR REPLACE option is provided to allow a new version of an existing trigger to replace the older version, without affecting any grants made for the original version of the trigger. An attempt is made to validate the trigger on occurrence of the event. You may need to set up data structures for certain examples to work: Other applications that modify the database will not be able to see the TEMP trigger and hence cannot run the trigger. It must be replaced with a new definition. Migration Issues for Triggers Non-compiled triggers cannot be fired under compiled trigger releases such as Oracle 7. The package should include a counter variable to detect this situation. This way, the trigger can minimize its overhead when the column of interest is not being changed. The object privileges to the schema objects referenced in the trigger body must be granted to the trigger's owner explicitly not through a role. Depending on the type of triggering statement, certain correlation names might not have any meaning. When RAISE IGNORE is called, the remainder of the current trigger program, the statement that caused the trigger program to execute and any subsequent trigger programs that would have been executed are abandoned. The xx stands for a variable minor release number. Oracle allows up to 32 triggers to cascade at any one time. If a timestamp or signature mismatch is found during execution of the trigger, then the remote procedure is not run, and the trigger is invalidated. If errors occur during the compilation of a trigger, then the trigger is still created. Thus, if a remote site is unavailable when the trigger must compile, then Oracle cannot validate the statement accessing the remote database, and the compilation fails. Now, if you want to modify the emplist column, which is the nested table of employees, then you can define an INSTEAD OF trigger over the column to handle the operation. Trigger Evaluation Order Although any trigger can run a sequence of operations either in-line or by calling procedures, using multiple triggers of the same type enhances database administration by permitting the modular installation of applications that have triggers on the same tables. For non-TEMP triggers, the table to be modified or queried must exist in the same database as the table or view to which the trigger is attached. Such applications might behave unpredictably.
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