重生之腥光大道下:oracle10g里用DBMS_SCHEDULER替代linux下的crontab

比如完成周日0级全备、周三1级备份、其它星期为2级备份，每天都是4:30开始执行，crontab里是如下设置：

$ crontab -l
30 4 * * 0 /orahome/backup/rman_level.sh 0
30 4 * * 3 /orahome/backup/rman_level.sh 1
30 4 * * 1,2,4,5,6 /orahome/backup/rman_level.sh 2

现在可以在oracle里通过dbms_scheduler包来设置，完成以上功能的调度设置如下：

SQL> conn /as sysdba

SQL> BEGIN
   DBMS_SCHEDULER.drop_job (job_name => 'rman_level0');
END;
/
SQL> BEGIN
   DBMS_SCHEDULER.drop_job (job_name => 'rman_level1');
END;
/
SQL> BEGIN
   DBMS_SCHEDULER.drop_job (job_name => 'rman_level2');
END;
/

SQL> BEGIN
   DBMS_SCHEDULER.create_job (
      job_name              => 'rman_level0',
      job_type              => 'EXECUTABLE',
      job_action            => '/orahome/backup/rman_level.sh',
      number_of_arguments   => 1,
      repeat_interval       => 'freq=daily; BYDAY=SUN; byhour=4; byminute=30',
      enabled               => FALSE,
      auto_drop             => FALSE,
      comments              => 'rman incremental level 0 backup database'
   );
   DBMS_SCHEDULER.set_job_argument_value ('rman_level0', 1, '0');
   DBMS_SCHEDULER.enable ('rman_level0');
END;
/

SQL> BEGIN
   DBMS_SCHEDULER.create_job (
      job_name              => 'rman_level1',
      job_type              => 'EXECUTABLE',
      job_action            => '/orahome/backup/rman_level.sh',
      number_of_arguments   => 1,
      repeat_interval       => 'freq=daily; BYDAY=WED; byhour=4; byminute=30',
      enabled               => FALSE,
      auto_drop             => FALSE,
      comments              => 'rman incremental level 1 backup database'
   );
   DBMS_SCHEDULER.set_job_argument_value ('rman_level1', 1, '1');
   DBMS_SCHEDULER.enable ('rman_level1');
END;
/

SQL> BEGIN
   DBMS_SCHEDULER.create_job (
      job_name              => 'rman_level2',
      job_type              => 'EXECUTABLE',
      job_action            => '/orahome/backup/rman_level.sh',
      number_of_arguments   => 1,
      repeat_interval       => 'freq=daily; BYDAY=MON,TUE,THU,FRI,SAT; byhour=4; byminute=30',
      enabled               => FALSE,
      auto_drop             => FALSE,
      comments              => 'rman incremental level 2 backup database'
   );
   DBMS_SCHEDULER.set_job_argument_value ('rman_level2', 1, '2');
   DBMS_SCHEDULER.enable ('rman_level2');
END;
/

使用dbms_sheduler包来设置定时任务的主要优势，除了安全原因外（也就是不想让能登陆linux的用户能看到数据库的备份策略），还有就是可以通过查看表dba_scheduler_job_run_details获得每次调度的详细信息：

SQL> SELECT   log_date,
           status,
           req_start_date,
           actual_start_date,
           run_duration,
           additional_info
    FROM   dba_scheduler_job_run_details
   WHERE   job_name LIKE 'RMAN%'
ORDER BY   1 DESC;

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