Clear History Table Every 6 Months - Review my PL/SQL Snippet

Question

The code below clears employees history table every 6 months. The code below executes fine, i'm just trying to make
sure if there is any logic error or not, I don't think so, but i would like to confirm from you.
-- This table holds delete date that deletes records from employee and customer history tables
CREATE TABLE historyDeletionDate (deleteHistoryDate DATE);
CREATE OR REPLACE PROCEDURE clear_emphistory
IS
   dateOfDeletion DATE;
BEGIN
   BEGIN
      SELECT deleteHistoryDate
        INTO dateOfDeletion
        FROM historyDeletionDate;
   EXCEPTION
      WHEN NO_DATA_FOUND THEN
         dateOfDeletion := SYSDATE;
   END;
   IF TRUNC(dateOfDeletion) <= TRUNC(SYSDATE) THEN
      EXECUTE IMMEDIATE 'truncate table CUSTOMERHISTORY';
      EXECUTE IMMEDIATE 'PURGE RECYCLEBIN';
      UPDATE historyDeletionDate SET deleteHistoryDate = ADD_MONTHS(SYSDATE, 6);
   END IF;
END;
/

Answer 1

Hi,
It look good to me: efficient and clear.
Production code should have some comments in it. Pretend that someone (someone you like) has to take over your job without any training on you code. What would that person find useful?
Instead of a one-row, one column table just to hold the next scheduled deleteHistoryDate, consider having a multi-row, 2-column table that also serves as a log of when deletions were actually done. You could have a scheduledDate column that is entered when the job is schduled, and a completedDate column that is originally NULL, but filled in when the job completes. The firest query would be:
SELECT  scheduledDate
  INTO  dateOfDeletion
  FROM  historyDeletionDate
WHERE  completedDate     IS NULL;