What is the method for scheduling PL/SQL backups?

There are many ways to implement scheduled backups in PL/SQL, one commonly used method is to use the DBMS_SCHEDULER package to create and manage scheduled tasks. Below is an example code for creating a scheduled backup task.

-- 创建定时任务
BEGIN
  DBMS_SCHEDULER.create_job (
    job_name        => 'backup_job',
    job_type        => 'PLSQL_BLOCK',
    job_action      => 'BEGIN my_backup_procedure; END;',
    start_date      => SYSTIMESTAMP,
    repeat_interval => 'FREQ=DAILY; BYHOUR=0; BYMINUTE=0; BYSECOND=0',
    enabled         => TRUE
  );
END;

-- 备份过程
CREATE OR REPLACE PROCEDURE my_backup_procedure IS
BEGIN
  -- 执行备份操作，例如使用RMAN命令备份数据库
  EXECUTE IMMEDIATE 'rman target / <<EOF
    BACKUP DATABASE PLUS ARCHIVELOG;
  EOF';
END;
/

In the example above, we first created a scheduled job named “backup_job” using the create_job procedure of the DBMS_SCHEDULER package. This job is scheduled to run at midnight every day and will call the my_backup_procedure to perform a backup operation. The backup operation will use the EXECUTE IMMEDIATE statement to execute RMAN commands for backing up the database.

It is important to note that in order to successfully perform a backup operation, the database user needs to have the permission to execute RMAN commands. Additionally, the execution of scheduled tasks is also subject to whether the database scheduler service is enabled and functioning properly.