How do you resolve ORA 04091 table is mutating trigger function may not see it?
Table of Contents
How do you resolve ORA 04091 table is mutating trigger function may not see 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.
What is mutating table error in Oracle?
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.
What is 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.
Can we write commit in trigger?
You can’t commit inside a trigger anyway. Show activity on this post. Trigger should not commit and cannot commit. Committing in a trigger usually raises an exception unless it happens into autonomous transaction.
What is a pragma in Oracle?
The PRAGMA keyword is used to signify that the remainder of the PL/SQL statement is a pragma, or directive, to the compiler. Also called apseudoinstruction, a pragma simply passes information to the compiler rather than getting transformed into a particular execution.
What is constraining table?
A constraining table is a table that a triggering statement might need to read either directly, for a SQL statement, or indirectly, for a declarative referential integrity constraint.
Can we ROLLBACK inside a trigger?
Changes made within triggers should thus be committed or rolled back as part of the transaction in which they execute. For this reason, triggers are NOT allowed to execute COMMIT or ROLLBACK statements (with the exception of autonomous triggers).
How do I run a trigger in Oracle?
A trigger is either a stored PL/SQL block or a PL/SQL, C, or Java procedure associated with a table, view, schema, or the database itself. Oracle Database automatically executes a trigger when a specified event takes place, which may be in the form of a system event or a DML statement being issued against the table.
How do you run a trigger?
Procedure
- Write a basic CREATE TRIGGER statement specifying the desired trigger attributes.
- In the trigger action portion of the trigger you can declare SQL variables for any IN, INOUT, OUT parameters that the procedure specifies.
- In the trigger action portion of the trigger add a CALL statement for the procedure.
What is the difference between pragma EXCEPTION_INIT and Raise_application_error?
EXCEPTION_INIT is helps to assign a error number to the exception and which can be raised using RAISE and can be handled in EXCEPTION block. RAISE_APPLICATION_ERROR is used to return a valid error message to the calling application like Java, .
