How to Implement a Database Sleep Function in Oracle Without Using DBMS_LOCK?

Database Sleep Function in Oracle Without DBMS_LOCK

In Oracle, the DBMS_LOCK.sleep function allows users to pause execution for a specified duration. However, using this function typically requires granting specific permissions to the procedure owner.

Consider the following function that leverages the DBMS_LOCK.sleep function:

CREATE OR REPLACE FUNCTION MYSCHEMA.TEST_SLEEP
(
TIME_  IN  NUMBER
)
RETURN INTEGER IS
 BEGIN
   DBMS_LOCK.sleep(seconds => TIME_);
RETURN 1;
 EXCEPTION
   WHEN OTHERS THEN
   RAISE;
   RETURN 1;
END TEST_SLEEP;

Although this function effectively pauses execution, its usage requires granting access to DBMS_LOCK. To circumvent this requirement, an alternative solution exists:

IN_TIME INT; --num seconds
v_now DATE;

-- 1) Get the date & time
SELECT SYSDATE
  INTO v_now
  FROM DUAL;

-- 2) Loop until the original timestamp plus the amount of seconds <= current date
LOOP
  EXIT WHEN v_now + (IN_TIME * (1/86400)) <= SYSDATE;
END LOOP;

This alternative method utilizes a LOOP to pause execution. It repeatedly retrieves the current date and time and compares it to the target delay. Once the current time exceeds the delay period, the loop exits, effectively simulating the effect of a sleep function without requiring special permissions.

The above is the detailed content of How to Implement a Database Sleep Function in Oracle Without Using DBMS_LOCK?. For more information, please follow other related articles on the PHP Chinese website!