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HomeDatabaseMysql Tutorial 通过oracle任务计划定期备份数据库

通过oracle任务计划定期备份数据库

Jun 07, 2016 pm 05:36 PM
oracleoperating systemdatabaseplandatabase

之前涉及到oracle定期备份的问题走的都是操作系统层面的任务计划,下面用oracle的taskscheduler定期执行oracle的备份,详细步骤见下:1备份语句/oracle/bak/full

之前涉及到oracle定期备份的问题走的都是操作系统层面的任务计划,下面用oracle的task scheduler 定期执行oracle的备份,详细步骤见下:


1 备份语句/oracle/bak/fullbk.txt如下:

[oracle@dest ~]$ cat /oracle/bak/fullbk.txt

run{

delete noprompt obsolete;       # 以不提示的方式删除状态为obsolete的备份(注意备份是否obsolete和备份保留策略有关)

crosscheck backup;              校验rman资料库中记录的备份是否存在于磁盘或物理设备上,如果不存在,,则更改rman资料库中该备份记录为expired状态

delete noprompt expired backup; # 以不提示的方式删除rman资料库中所有标记为expired状态的记录

crosscheck archivelog all;      # 校验rman资料库中所有归档记录,对在物理设备上不存在的归档,在rman资料库中更新其标记为expired

delete noprompt expired archivelog all; #以不提示的方式删除rman资料库中所有标记为expired状态的归档记录

backup incremental level=0  database format '/backup/crm/full-%T-%U.bak'; #做一个0级别的数据库全备份

backup archivelog all  format '/backup/crm/arch-%T-%U.bak'; #备份所有归档

backup current controlfile format '/backup/crm/ctl-%T-%U.bak'; #备份当前控制文件

backup spfile format '/backup/crm/spf-%T-%U.bak';              # 备份参数文件  

delete noprompt archivelog all completed before 'SYSDATE - 7'; # 以不提示的方式删除7天之前的所有归档

}

注意 以上脚本仅仅是为测试,该脚本对于从上一次全备份到数据库当前状态丢失了一部分归档,或者归档损坏的情况,是无法进行完全恢复的。


2 备份脚本/oracle/bak/rman.sh如下:


[oracle@dest ~]$ cat /oracle/bak/rman.sh 

#!/bin/bash

export today=`date +%Y%m%d%H%M`

export ORACLE_HOME=/oracle/app/db1

export ORACLE_SID=CRM

$ORACLE_HOME/bin/rman target sys/DHHZDHHZ log=/oracle/bak/crm.log cmdfile=/oracle/bak/fullbk.txt

mv /oracle/bak/crm.log  "/oracle/bak/crm${today}.log"


此脚本让rman调用/oracle/bak/fullbk.txt文本中的备份语句,记录当前备份过程于日志文件,并更改生成的日志文件名为当前日期。


3 在oracle中创建program

begin

  dbms_scheduler.create_program (

   program_name           =>'oracle_bk_program',

   program_action         =>'/oracle/bak/rman.sh',

   program_type           =>'EXECUTABLE',

   enabled                =>true,

   comments               =>'oracle.sh');

end;

查询我们刚刚创建的program如下

select program_name,program_type,program_action,number_of_arguments,enabled from user_scheduler_programs where program_name='ORACLE_BK_PROGRAM';

PROGRAM_NAME           PROGRAM_TYPE     PROGRAM_ACTION      NUMBER_OF_ARGUMENTS ENABL

------------------- ---------------- ---------------------- ------------------- -----

ORACLE_BK_PROGRAM     EXECUTABLE       /oracle/bak/rman.sh              0        TRUE


注意如果要修改程序,job或者shceduler则可用如下语句

BEGIN

  DBMS_SCHEDULER.SET_ATTRIBUTE (

   name           => '',

   attribute      => '',

   value          => '');

END;

/

如下:

BEGIN

  DBMS_SCHEDULER.SET_ATTRIBUTE (

   name           => 'oracle_bk_schedule',

   attribute      => 'repeat_interval',

   value          => 'FREQ=DAILY;BYHOUR=15,16,17');

END;

/



4 创建一个scheduler

begin

dbms_scheduler.create_schedule(

 schedule_name    =>'oracle_bk_schedule',

 repeat_interval  =>'FREQ=DAILY;BYHOUR=15,16,17',

 comments         =>'backup start 3pm');

end;

/

查选我们刚刚创建的scheduler如下:

SQL> select schedule_name,repeat_interval from user_scheduler_schedules where schedule_name='ORACLE_BK_SCHEDULE';


SCHEDULE_NAME                  REPEAT_INTERVAL

------------------------------ ------------------------------------------------------------

ORACLE_BK_SCHEDULE             FREQ=DAILY;BYHOUR=17


5 创建一个job,在job中引用创建的程序和scheduler

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