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HomeDatabaseMysql TutorialOracle中通过Job实现定时同步两个数据表之间的数据

摘要:之前项目中用的触发器来实现数据解析,但是最近客户反应,会报错,所以我们从新设计了一下,通过Oracle里面的Job来解决这一问题,这样就不会对原来的数据表做操作,只对临时表操作,就不会对客户那边的上级服务器产生影响了,详细请看下面: 一:首先

摘要:之前项目中用的触发器来实现数据解析,但是最近客户反应,会报错,所以我们从新设计了一下,通过Oracle里面的Job来解决这一问题,这样就不会对原来的数据表做操作,只对临时表操作,就不会对客户那边的上级服务器产生影响了,详细请看下面:

一:首先建个主表:MBINMSGS(这里的用户是MIP)

CREATE TABLE MIP.MBINMSGS
(
  ID                            NUMBER(30)      NOT NULL,
  MBINMSGS_CLOB_MSG             CLOB,
  MBINMSGS_DATE_RECEIVED        DATE,
  MBINMSGS_DATE_PROCESSED       DATE,
  MBINMSGS_SUBSYSTEM_NAME       VARCHAR2(100 BYTE),
  MBINMSGS_SUBSYSTEM_DATE_SENT  DATE,
  SERVICENAME                   VARCHAR2(30 BYTE) NOT NULL
)

二:其次建个临时表用来存储主表过来的数据:MBINMSGS_TEMP

CREATE TABLE MIP.MBINMSGS_TEMP
(
  ID                            NUMBER(30)      NOT NULL,
  MBINMSGS_CLOB_MSG             CLOB,
  MBINMSGS_DATE_RECEIVED        DATE,
  MBINMSGS_DATE_PROCESSED       DATE,
  MBINMSGS_SUBSYSTEM_NAME       VARCHAR2(100 BYTE),
  MBINMSGS_SUBSYSTEM_DATE_SENT  DATE,
  SERVICENAME                   VARCHAR2(30 BYTE) NOT NULL
)
三:建立同步数据的存储过程:JOB_PRO_TEMP
CREATE OR REPLACE PROCEDURE MIP.JOB_PRO_TEMP
AS
   TEMP_ID   NUMBER;
BEGIN
   SELECT   NVL (MAX (ID), 0) INTO TEMP_ID FROM MBINMSGS_TEMP;

   INSERT INTO MBINMSGS_TEMP
      SELECT   *
        FROM   MBINMSGS
       WHERE   MBINMSGS.ID > TEMP_ID;

   --insert into MBINMSGS_TEST select * from MBINMSGS;

   COMMIT;
EXCEPTION
   WHEN OTHERS
   THEN
      DBMS_OUTPUT.PUT_LINE ('Exception happened,data was rollback');
      ROLLBACK;
END;
/
四:建立定时执行存储过程的Job:
var job_num number;
begin
	dbms_job.submit(:job_num,'JOB_PRO_TEMP;',SYSDATE,'sysdate+1/24/60');
end;
commit;
五:查看新建的Job是否正确运行:
SELECT * FROM USER_JOBS;
六:可能有的人会说我建了Job但是不能运行,那说明你的Job没有运行,我在这个过程中就遇到了这个的问题,最后经过查找,解决了,办法如下:
检查Oracle的JOB运行环境:如果为0表示不运行JOB,Oracle一般默认安装完为10,但是我安装oracle以后就不知道为什么是0。
	查看进程数(这里是用system管理员账号登录)
	show parameter job_queue_processes;
	修改进程数(如果你的是0,才需要按照以下语句修改):
	我这里改为10模拟以下这个操作;
	在PL/SQL的command窗口中输入以下语句:
	alter system set job_queue_processes=10 scope=both;
	修改完以后我们查看一下,如果为10那就说明好了,然后你把刚才建的Job删除了,在重新建立一个Job:
	show parameter job_queue_processes;
七:删除Job的方法:
exec dbms_job.remove(81);

说明:这里的数字81是对应DBA_JOBS表中当前要删除的JOB记录所在行的JOB字段的值;


更加详细的关于Oracle的Job请看:http://www.cnblogs.com/java-pan/archive/2012/09/16/oracle_job.html
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