How Can I Achieve a Sleep Function in Oracle Without DBMS_LOCK.sleep Permissions?

Sleep Function in Oracle: Alternative to DBMS_LOCK.sleep

In Oracle, the DBMS_LOCK.sleep function is commonly used to pause execution for a specified duration. However, this function requires specific permissions, which may not be granted to all users.

Problem

The presented code snippet demonstrates a function (TEST_SLEEP) that utilizes DBMS_LOCK.sleep to pause execution for a given number of seconds. However, the function requires the owner of the procedure to be granted access to DBMS_LOCK.

Solution

Without using DBMS_LOCK.sleep, there are alternative methods to achieve a similar effect:

1. Looping with Current Timestamp

This approach uses a loop to repeatedly check the current timestamp until the desired amount of time has elapsed:

CREATE OR REPLACE FUNCTION MYSCHEMA.MY_SLEEP
(
  IN_TIME IN NUMBER
)
RETURN INTEGER IS
BEGIN
  v_now DATE;    -- Current timestamp
  IN_TIME := IN_TIME * (1/86400);  -- Convert to fractional day
  
  SELECT SYSDATE INTO v_now FROM DUAL;
  
  LOOP
    EXIT WHEN v_now + IN_TIME <= SYSDATE;
    -- Check again after 1 millisecond
    DBMS_LOCK.SLEEP(1000000 / 86400000);
  END LOOP;
  
  RETURN 1;
END MY_SLEEP;

This function loops until the difference between the current timestamp and the initial timestamp (plus the specified sleep time) becomes less than or equal to 0. The time delay is introduced using DBMS_LOCK.SLEEP with a small increment (1 microsecond) to avoid overwhelming the system.

Note:

Although this method does not require DBMS_LOCK.sleep permission, it may not be as accurate or efficient as DBMS_LOCK.sleep in certain scenarios.

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