How does materialized view work when refresh the view vs create the view?

I am using a materialized view, and I cant set it to fast refresh because some of the tables are from remote database which does not have materialized view log.
When I create the materialized view, it took like 20 30 seconds. however when I was trying to refresh it. It took more than 2 3 hours. and total number of records are only around 460,000.
I understand that when the view refreshes, it would take extra step like purge the table however I am not sure why it made so much difference in execution time perspective...
Does the dbms_mview.refresh('MY_MATVIEW', 'C', atomic_refresh=>false) do the same exact insert as when I created the view?
Could anyone please let me know how would this happen? Thanks,
Code looks like as following
create materialized view MY_MV1
refresh force on demand
start with to_date('20-02-2013 22:00:00', 'dd-mm-yyyy hh24:mi:ss') next trunc(sysdate)+1+22/24
as
( SELECT Nvl(Cr.Sol_Chng_Num, ' ') AS Change_Request_Nbr,
       Nvl(Sr.Sr_Num, ' ') AS Service_Request_Nbr,
       Nvl(Sr.w_Org_Id, 0) AS Org_Id,
       Fcr.rowid,
       Cr.rowid,
       Bsr.rowid,
       Sr.rowid,
       SYSDATE
FROM [email protected] Fcr
INNER JOIN [email protected] Cr
    ON Fcr.w_Sol_Chng_Id = Cr.w_Sol_Chng_Id
INNER JOIN [email protected] Bsr
    ON Fcr.w_Sol_Chng_Id = Bsr.w_Sol_Chng_Id
INNER JOIN [email protected] Sr
    ON Sr.w_Srv_Rec_Id = Bsr.w_Srv_Rec_Id
WHERE Sr.Sr_Num !='NS'
);I have tried to use dbms_mview.refresh('MY_MATVIEW', 'C', atomic_refresh=>false) but it still took 141 mins to run... vs 159 mins without atomic_refresh=>false
Edited by: 986006 on Feb 20, 2013 2:15 PM

Welcome to the forum!
Whenever you post provide your 4 digit Oracle version (result of SELECT * FROM V$VERSION)
>
I am using a materialized view, and I cant set it to fast refresh because some of the tables are from remote database which does not have materialized view log.
When I create the materialized view, it took like 20 30 seconds. however when I was trying to refresh it. It took more than 2 3 hours. and total number of records are only around 460,000.
I understand that when the view refreshes, it would take extra step like purge the table however I am not sure why it made so much difference in execution time perspective...
Does the dbms_mview.refresh('MY_MATVIEW', 'C', atomic_refresh=>false) do the same exact insert as when I created the view?
>
What Oracle version are you using? The 'atomic_refresh' parameter default was changed to TRUE starting with 10g.
See the PL/SQL Packages and Types doc
>
atomic_refresh
If this parameter is set to true, then the list of materialized views is refreshed in a single transaction. All of the refreshed materialized views are updated to a single point in time. If the refresh fails for any of the materialized views, none of the materialized views are updated.
If this parameter is set to false, then each of the materialized views is refreshed in a separate transaction.
>
What that means is that if the value is TRUE Oracle uses a DELETE to remove the existing rows. If the value is FALSE then Oracle uses TRUNCATE.
If you really are using the FALSE setting you should not be seeing that much of a time difference between creating the MV and a complete refresh so something else must be going on.

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