Delete column data every 30 days

Question

Hi,
I got a question for you all. I had a BLOB column in my database. I will insert pdf’s into that BLOB column. If I want to delete the data in that BLOB column for every 30 days, what do I need to do? I am looking for some suggestions.
Thanks

Answer 1

Hello,
Once you created the schedule to delete or purge column after every 30 days or last day of every month. You need to create a job and associate your job to your schedule.
Monthly Schedule runs last day of month at 4:01 AM_
Schedule_
BEGIN
   sys.DBMS_SCHEDULER.create_schedule (repeat_interval => 'FREQ=MONTHLY;BYMONTHDAY=-1;BYHOUR=4;BYMINUTE=1;BYSECOND=0',
                                       start_date => SYSTIMESTAMP AT TIME ZONE 'US/Eastern',
                                       comments => 'Monthly_purge',
                                       schedule_name => '"MYUSER"."MONTHLY_PURGE"'
END;
Job to purge or delete colum with above schedule_
BEGIN
   sys.DBMS_SCHEDULER.create_job (job_name => '"MYUSER"."MY_DELETE_JOB"',
                                  job_type => 'PLSQL_BLOCK',
                                  job_action => 'begin
   Delete from pdf_table where id=''pdf'';
end;',
                                  schedule_name => 'MYUSER.MONTHLY_PURGE',
                                  job_class => 'DEFAULT_JOB_CLASS',
                                  comments => 'Delete a blob column every 30 days',
                                  auto_drop => FALSE,
                                  enabled => FALSE
   sys.DBMS_SCHEDULER.set_attribute (name => '"MYUSER"."MY_DELETE_JOB"',
                                     attribute => 'job_priority',
                                     VALUE => 2
   sys.DBMS_SCHEDULER.set_attribute (name => '"MYUSER"."MY_DELETE_JOB"',
                                     attribute => 'restartable',
                                     VALUE => TRUE
   sys.DBMS_SCHEDULER.enable ('"MYUSER"."MY_DELETE_JOB"');
END;Regards