Materialized view taking too much time

materialized-vieworacleoracle-10g

i create a materialized view fast refresh. it takes almost 45 min to create but it did not refresh in 24 hours. i tried it on with index and without index. i check the log of all table max record in log table is 2 lac. query is as under please suggest what changes needed 

CREATE MATERIALIZED VIEW LOG ON a WITH ROWID,   SEQUENCE (COLUMN USED FROM THIS TABLE)
/
CREATE MATERIALIZED VIEW LOG ON P WITH ROWID,   SEQUENCE (COLUMN USED FROM THIS TABLE)
/
CREATE MATERIALIZED VIEW LOG ON PG WITH ROWID,  SEQUENCE (COLUMN USED FROM THIS TABLE)
/
CREATE MATERIALIZED VIEW LOG ON PN WITH ROWID, SEQUENCE (COLUMN USED FROM THIS TABLE))
/ 
CREATE MATERIALIZED VIEW LOG ON AP WITH ROWID
/
CREATE  MATERIALIZED VIEW C_INFO 
NOLOGGING
BUILD IMMEDIATE
refresh fast with rowid 
on demand
AS
SELECT  
   A.ROWID ACTROWID , P.ROWID PREMROWID, 
   PG.ROWID PGROWID,AP.ROWID APROWID, PN.ROWID PNROWID,
   ...
FROM     A,    P,   pg,    ap, pn      
WHERE   
        p.id             =  pg.id (+)
    and pg.columname  (+)=  'Value' 
...

Best Answer

Your materialized is not defined with a NEXT clause, therefore it will only refresh when you ask for it explicitely. You can use either DBMS_MVIEW.REFRESH directly or create a refresh group with DBMS_REFRESH.

In order to automate the refresh, you could program a job with DBMS_SCHEDULER or DBMS_JOB (dbms_job is deprecated in 11g).

You could also define your MV with a NEXT clause, for example this will refresh the MV every hour:

CREATE MATERIALIZED VIEW  C_INFO 
NOLOGGING
BUILD IMMEDIATE
refresh fast with rowid 
on demand
NEXT sysdate + 1/24
Related Question