IN AUTONOMOUS TRANSACTION

Data Manipulation (DML) StatementsBuilt-in Scalar Functions

`IN AUTONOMOUS TRANSACTION`

Executes a statement or a block of statements in an autonomous transaction

Syntax

IN AUTONOMOUS TRANSACTION DO <compound_statement>

Table 1. `IN AUTONOMOUS TRANSACTION` Statement Parameter
Argument	Description
compound_statement	A single statement, or statements wrapped in `BEGIN … END`

The IN AUTONOMOUS TRANSACTION statement enables execution of a statement or a block of statements in an autonomous transaction.Code running in an autonomous transaction will be committed right after its successful execution, regardless of the status of its parent transaction.This can be used when certain operations must not be rolled back, even if an error occurs in the parent transaction.

An autonomous transaction has the same isolation level as its parent transaction.Any exception that is thrown in the block of the autonomous transaction code will result in the autonomous transaction being rolled back and all changes made will be undone.If the code executes successfully, the autonomous transaction will be committed.

`IN AUTONOMOUS TRANSACTION` Examples

Using an autonomous transaction in a trigger for the database ON CONNECT event, to log all connection attempts, including those that failed:

CREATE TRIGGER TR_CONNECT ON CONNECT
AS
BEGIN
  -- Logging all attempts to connect to the database
  IN AUTONOMOUS TRANSACTION DO
    INSERT INTO LOG(MSG)
    VALUES ('USER ' || CURRENT_USER || ' CONNECTS.');
  IF (EXISTS(SELECT *
             FROM BLOCKED_USERS
             WHERE USERNAME = CURRENT_USER)) THEN
  BEGIN
    -- Logging that the attempt to connect
    -- to the database failed and sending
    -- a message about the event
    IN AUTONOMOUS TRANSACTION DO
    BEGIN
      INSERT INTO LOG(MSG)
      VALUES ('USER ' || CURRENT_USER || ' REFUSED.');
      POST_EVENT 'CONNECTION ATTEMPT BY BLOCKED USER!';
    END
    -- now calling an exception
    EXCEPTION EX_BADUSER;
  END
END

IN AUTONOMOUS TRANSACTION