How to Implement Sleep Functionality in Oracle Without DBMS_LOCK Privileges?

Implementing Sleep Functionality in ORACLE Without DBMS_LOCK

Manually delaying the execution of an SQL query in ORACLE may arise as a requirement in certain scenarios. However, relying on the DBMS_LOCK.sleep function often requires granting privileges to the user executing the procedure. To circumvent this, an alternative approach can be employed.

The provided function, MYSCHEMA.TEST_SLEEP, uses DBMS_LOCK.sleep to pause execution for a specified number of seconds. However, it necessitates granting the DBMS_LOCK privilege to the procedure owner. To avoid this, the following code snippet offers a alternative method:

CREATE OR REPLACE FUNCTION MYSCHEMA.ALTERNATIVE_SLEEP
(
  TIME_  IN  NUMBER
)
RETURN INTEGER IS
  IN_TIME INT; -- seconds to sleep
  v_now DATE; -- current date and time

  BEGIN
    SELECT SYSDATE -- Get the current date and time
      INTO v_now
      FROM DUAL;

    LOOP -- Sleep until the specified time has elapsed
      EXIT WHEN v_now + (IN_TIME * (1/86400)) <= SYSDATE; -- Break from the loop when the target time is reached
      END LOOP;

    RETURN 1; -- Dummy return value to avoid syntax errors
    EXCEPTION
      WHEN OTHERS THEN
        RAISE;
        RETURN 1; -- Dummy return value to avoid syntax errors
    END ALTERNATIVE_SLEEP;

This function leverages a loop to simulate the sleep functionality without utilizing the DBMS_LOCK package. It periodically checks the current date and time to determine if the specified sleep duration has passed. When the target time is reached, the loop exits. This approach effectively pauses the procedure's execution for the desired amount of time.

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