12

I created a materialized view that refreshed every 5 min but when I do insert and perform select on materialized view I get same old data? Do I need to refresh manually?

CREATE MATERIALIZED VIEW MVW_TEST
REFRESH FORCE ON DEMAND 
START WITH TO_DATE('01-01-2009 00:01:00', 'DD-MM-YYYY HH24:MI:SS') NEXT SYSDATE + 1/1152 
As select * from TEST12
4

2 回答 2

28

I have demonstrated in steps where a materialized view refresh after every one minute ,for having a mv which refresh after 5 minute use next(sysdate+5/1440)

Step1: 

Create table temp (A int);

Step2:

Create Materialized view temp_mv
      refresh complete start with (sysdate) next  (sysdate+1/1440) with rowid
        as select * from temp;

Step3: 

select count(*) from temp;

       COUNT(*)
      ----------
          0

Step4:

select count(*) from temp_mv;

       COUNT(*)
      ----------
          0

Step5:

begin
      for i in 1..10 loop
         insert into temp values (i+1);
      end loop;
end;
/

Step6: 

commit;

Step7: 

select count(*) from temp;

       COUNT(*)
     ----------
        10

Step8:

select count(*) from temp_mv;

       COUNT(*)
       ----------
          0

Step9: 

select to_char(sysdate,'hh:mi') from dual;

       TO_CH
       -----
       04:28

Step10:

select to_char(sysdate,'hh:mi') from dual;

       TO_CH
        -----
       04:29

Step11:

select count(*) from temp;

      COUNT(*)
     ----------
        10

Step12:

select count(*) from temp_mv;

      COUNT(*)
      ----------
         10
于 2012-04-08T11:02:03.340 回答
6

You can also create a scheduler job:

BEGIN
  SYS.DBMS_SCHEDULER.CREATE_JOB
    (
       job_name        => 'DBAPER.MVW_TEST_REFRESH'
      ,start_date      => TO_TIMESTAMP_TZ('2011/09/02 00:00:00.000000 US/Central','yyyy/mm/dd hh24:mi:ss.ff tzr')
      ,repeat_interval => 'FREQ=DAILY;BYHOUR=6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22;BYMINUTE=0,5,10,15,20,25,30,35,40,45,50,55'
      ,end_date        => NULL
      ,job_class       => 'DEFAULT_JOB_CLASS'
      ,job_type        => 'PLSQL_BLOCK'
      ,job_action      => 'BEGIN 
                            DBMS_MVIEW.REFRESH(''MVW_TEST'',''C'');
                            END;'
      ,comments        => 'Job to refresh materialized view MVW_TEST.'
    );
END;
/

That way you have more configuration options, like excluding night hours or weekends for example.

于 2015-06-11T23:04:43.577 回答