How Can I Simulate DBMS_LOCK.sleep Without Granting Privileges?

Sleep Function Alternatives in ORACLE

To alleviate the need for explicit grants to the DBMS_LOCK package, an alternative approach can be employed to simulate the functionality of the DBMS_LOCK.sleep procedure. While this method is acknowledged as a "horrible hack," it provides a workaround without resorting to permission modifications.

The custom function below relies on a timestamp-based approach:

-- Custom sleep function without DBMS_LOCK
CREATE OR REPLACE FUNCTION MYSCHEMA.ALTERNATIVE_SLEEP
(
  IN_TIME  NUMBER
)
RETURN INTEGER IS
  v_now DATE;
BEGIN
  -- Capture the current time
  SELECT SYSDATE INTO v_now FROM DUAL;

  -- Loop until the current time exceeds the initial time + input seconds
  LOOP
    EXIT WHEN v_now + (IN_TIME * (1/86400)) <= SYSDATE;
  END LOOP;

  RETURN 1;
EXCEPTION
  WHEN OTHERS THEN
    RAISE;
    RETURN 1;
END ALTERNATIVE_SLEEP;

This function employs a series of date and time manipulations to achieve a sleep-like behavior. It iteratively checks if the current time has exceeded the desired sleep time by adding the input seconds to the initial time. When this condition is met, the function exits the loop.

Usage of this custom function is similar to the original approach:

SELECT ALTERNATIVE_SLEEP(10.5) FROM DUAL;

Note that this method has its drawbacks and is not recommended for practical use.

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