procedure scheduled job inside package - oracle

Question

I have created a package purging inside that created procedure. How to schedule procedure around 2AM CST?
create or replace package body purging as
PROCEDURE del_exp IS
begin
FOR td IN (
SELECT
table_name
FROM
all_tables
where owner = 'ud_oi' and table_name not like 'lgh%'
)
LOOP
EXECUTE IMMEDIATE 'DELETE FROM ' || td.table_name || ' WHERE TRUNC(case_dt) < TRUNC(sysdate - 38)' ;
END LOOP;
end;
END del_exp;

Answer 1

A simple option is to use DBMS_JOB; if your database is recent, DBMS_SCHEDULER is preferred. You'd do it as follows:
DECLARE
X NUMBER;
BEGIN
SYS.DBMS_JOB.SUBMIT (
job => X,
what => 'begin purging.del_exp; end;',
next_date => TO_DATE ('16.06.2020 02:00:00', 'dd/mm/yyyy hh24:mi:ss'),
interval => 'TRUNC (SYSDATE+1) + 2 / 24',
no_parse => FALSE);
SYS.DBMS_OUTPUT.PUT_LINE ('Job Number is: ' || TO_CHAR (x));
COMMIT;
END;
/
A DBMS_SCHEDULER option (which also shows how to run it during working days (at least, working here where I live)):
BEGIN
DBMS_SCHEDULER.CREATE_JOB (
job_name => 'purging',
job_type => 'PLSQL_BLOCK',
job_action => 'begin purging.del_exp; end;',
start_date => TO_TIMESTAMP_TZ ('16.06.2020 02:00 Europe/Zagreb',
'dd.mm.yyyy hh24:mi TZR'),
repeat_interval => 'FREQ=DAILY; BYDAY=MON,TUE,WED,THU,FRI; BYHOUR=2; BYMINUTE=0',
enabled => TRUE,
comments => 'Purge tables');
END;
/
Just to mention: condition you wrote:
table_name not like 'lgh%'
looks suspicious. Table names are - by default - in UPPERCASE. Unless you create tables using mixed (or lower) case, you can do that by enclosing their names into double quotes. I hope you didn't/don't do that. Therefore, you'd rather use
table_name not like 'LGH%'