【那些ORCALE DB可以做到的事】
我们可以在 ORACLE DB 中使用 ORACLE 提供的 dbms_scheduler 设置schedule job, 同时会记录下来每次的运行结果，无需自己log
通过以下语句，可以查看已有的jobs, schedules, programs

SELECT * FROM user_scheduler_jobs; --已有jobs
SELECT * FROM user_scheduler_job_args; --已有参数
SELECT * FROM user_scheduler_job_log;
SELECT * FROM user_scheduler_job_run_details;
SELECT * FROM user_scheduler_programs; --已有programs
SELECT * FROM user_scheduler_schedules; --已有schedules

简单无参数的JOBS, RUN PROCEDURE

DECLARE
  num number;
BEGIN
  SELECT count(1) INTO num FROM user_scheduler_jobs WHERE job_name = 'XXX_JOBS';
  if num > 0 then
     dbms_scheduler.drop_job(job_name => 'XXX_JOBS');    --如果已存在先drop再create
  end if;
  dbms_scheduler.create_job(  
        job_name => 'XXX_JOBS',  
        job_type => 'STORED_PROCEDURE', 
        job_action => 'USER_JOB_PACKAGE.USER_JOB_MAIN_XXX',  
        number_of_arguments => 0,   --没有参数
        repeat_interval => 'freq=daily;interval=1;byhour=8;byminute=0;bysecond=0',  --每天早上8点run 
        enabled => TRUE); --设置TRUE定时任务开启 
END;
/

带参数的JOBS

DECLARE
  num number;
BEGIN
  SELECT count(1) INTO num FROM user_scheduler_jobs WHERE job_name = 'XXX_HOURLY_JOBS';
  if num > 0 then
     dbms_scheduler.drop_job(job_name => 'XXX_HOURLY_JOBS');
  end if;
  dbms_scheduler.create_job(  
        job_name => 'XXX_HOURLY_JOBS',  
        job_type => 'STORED_PROCEDURE',  
        job_action => 'USER_JOB_PACKAGE.USER_JOB_MAIN_XXX',  
        number_of_arguments => 6,   
        repeat_interval => 'freq=HOURLY;interval=1;',   --每个小时跑一次
        enabled => FALSE); -- create 有参数job时 enabled会报错没有参数设置， 先disabled

  dbms_scheduler.set_job_argument_value (             
        job_name => 'XXX_HOURLY_JOBS',                       
        argument_position => 1,                                                   
        argument_value => 'USER NAME'  
        );
  dbms_scheduler.set_job_argument_value (             
        job_name => 'XXX_HOURLY_JOBS',                       
        argument_position => 2,                                              
        argument_value => 'ACTION LOG'  
        );
  dbms_scheduler.set_job_argument_value (             
        job_name => 'XXX_HOURLY_JOBS',                       
        argument_position => 3,                                              
        argument_value => 1
        );
  dbms_scheduler.set_job_argument_value (             
        job_name => 'XXX_HOURLY_JOBS',                       
        argument_position => 4,                                              
        argument_value => null  
        );
  dbms_scheduler.set_job_argument_value (             
        job_name => 'XXX_HOURLY_JOBS',                       
        argument_position => 5,                                                
        argument_value => null
        );
  dbms_scheduler.set_job_argument_value (             
        job_name => 'XXX_HOURLY_JOBS',                       
        argument_position => 6,                                                  
        argument_value => null  
        );
  dbms_scheduler.enable(name => 'XXX_HOURLY_JOBS'); -- 最后enable job
END;
/

以上是采用JOBS直接定时运行， 下面介绍使用Schedule + Programs + Jobs 设置定时任务

-- CREATE  PROGRAM 指定需要跑的PROCEDURE
DECLARE
  num number;
BEGIN
  SELECT count(1) INTO num FROM user_scheduler_programs WHERE program_name = 'TEST_PROGRAMS';
  if num > 0 then
     dbms_scheduler.drop_program(program_name => 'TEST_PROGRAMS',force => TRUE);
  end if;
  dbms_scheduler.create_program( program_name        => 'TEST_PROGRAMS',
                                 program_type        => 'STORED_PROCEDURE',
                                 program_action      => 'TEST_PACKAGE.TEST_MAIN_PROCEDURE',
                                 number_of_arguments => 0,
                                 enabled             => TRUE,
                                 comments            => 'Test for setup programs');
END;
/

-- CREATE  SCHEDULE 设置时间
DECLARE
  num number;
BEGIN
  SELECT count(1) INTO num FROM user_scheduler_schedules WHERE schedule_name = 'TEST_SCHEDULE';
  if num > 0 then
     dbms_scheduler.drop_schedule(schedule_name => 'TEST_SCHEDULE');
  end if;
  dbms_scheduler.create_schedule(schedule_name   => 'TEST_SCHEDULE',
                                  repeat_interval => 'freq=daily;interval=1;byhour=8;byminute=0;bysecond=0');
END;
/

-- OK 将之前CREATE的 SCHEDULE，PROGRAM 放入 JOBS中
DECLARE
  num number;
BEGIN
  SELECT count(1) INTO num FROM user_scheduler_jobs WHERE job_name = 'TEST_JOBS';
  if num > 0 then
     dbms_scheduler.drop_job(job_name => 'TEST_JOBS');
  end if;
  dbms_scheduler.create_job(job_name      => 'TEST_JOBS',
                             program_name  => 'TEST_PROGRAMS', -- 指定之前定义的 program
                             schedule_name => 'TEST_SCHEDULE'); -- 指定之前定义的 schedule
END;
/

Reference:
ORACLE DOCS - DBMS_SCHEDULER