How to Simulate DBMS_LOCK.sleep in Oracle Without Security Risks?

Sleeveless Sleep in Oracle

The DBMS_LOCK.sleep function provides a convenient way to pause execution in an Oracle database for a specified duration. However, granting access to this function can be a security risk. Is there an alternative approach to pausing execution without resorting to DBMS_LOCK.sleep?

Solutions

Unfortunately, without access to DBMS_LOCK.sleep, a direct replacement may not be readily available. However, there is a workaround that can simulate a sleep-like behavior:

CREATE OR REPLACE FUNCTION MYSCHEMA.NO_SLEEP
(
  IN_TIME INT  -- Number of seconds
)
RETURN INTEGER
AS
BEGIN
  DECLARE
    v_now DATE;  -- Current date and time
  BEGIN
    -- 1) Get the current date and time
    SELECT SYSDATE INTO v_now FROM DUAL;
    
    -- 2) Loop until the current date is greater than or equal to the timestamp plus the delay
    LOOP
      EXIT WHEN v_now + (IN_TIME * (1/86400)) >= SYSDATE;  -- Convert seconds to fractional days
    END LOOP;
    
    RETURN 0;  -- Return 0 upon successful sleep
  EXCEPTION
    WHEN OTHERS THEN
      RETURN -1;  -- Return -1 in case of any other error
  END;
END NO_SLEEP;

Usage

This function can be used similarly to DBMS_LOCK.sleep:

SELECT NO_SLEEP(10.5) FROM DUAL;  -- Sleep for 10.5 seconds

Note:

While this workaround simulates a sleep function, it is important to note that it is merely a hack and not as efficient as DBMS_LOCK.sleep. It is recommended to grant access to DBMS_LOCK.sleep if the application genuinely requires pausing execution.

The above is the detailed content of How to Simulate DBMS_LOCK.sleep in Oracle Without Security Risks?. For more information, please follow other related articles on the PHP Chinese website!