Performance Tuning :: How To Refresh Materialized View Data
Jun 12, 2013
I have created a materialized view and also a normal View, which has 3 tables used in both the views, when inserted new records it reflects in a normal view but when i select the materialized view i cant see the updated data.
here is the materialized view i created;
CREATE MATERIALIZED VIEW pct_sales_materialized
BUILD IMMEDIATE REFRESH ON DEMAND
ENABLE QUERY REWRITE
AS
SELECT A.DEP_NAME,B.EMP_ID,C.EMP_NAME
FROM department_head A,department_child B,emp_detail C
WHERE A.DEP_ID = B.DEP_ID
AND B.EMP_ID = C.EMP_ID
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Mar 20, 2012
I need to create a Materialized View, which should refresh every Tuesday and Friday at 5am.
CREATE MATERIALIZED VIEW DUAL_MV
TABLESPACE USERS_SMALL
REFRESH NEXT NEXT_DAY(TRUNC(SYSDATE), 'TUESDAY') + 05/24
AS SELECT * FROM DUAL;
I can do it for single day like above, but how to refresh on multiple days, using create materialized view syntax .
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Jan 16, 2012
I have a base table with ~20 mio. records with two FAST REFRESH Materialized Views based on that table using various aggregate functions in their view definition.
The problem is, when e.g. one record changes in the base table, I see two records in the MV log table MLOG$, but invoking the fast refresh mechanism by using using:
dbms_snapshot.refresh('mv1', 'f');
dbms_snapshot.refresh('mv2', 'f');
Is still running after ~20 minutes now.
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Oct 10, 2013
I've 2 tables in schema A.
1) TXN_HD_FCT (This table has 6 billion records. Has fields TXN_DT, CUST_ID, TXN_AMT, TXN_ID and the table is partitioned on TXN_DT. We load data approximately 600K+ records to this table every day
2) RELINK_CUST (This table has 2 fieds CUST_ID and NEW_CUST_ID). We load data approximatley 100-200K+ records every day into this table. This table has total 10MM+ records now.
Now i need to create a table (TXN_UPD_HDR_FCT) in Schema B by joining above 2 tables using below query every day
CREATE TABLE TXN_UPD_HDR_FCT
select a.TXN_DT,
nvl(b.new_cust_id, a.cust_id) as cust_id,
a.txn_amt,
a.txn_id,
from schema_A.TXN_HD_FCT a,
schema_A.RELINK_CUST b
where a.cust_id = b.cust_id(+);
We update CUST_ID to NEW_CUST_ID based on some rules (and keep it in the table RELINK_CUST) and need to take this new_cust_id while building the table TXN_UPD_HDR_FCT.
Building this table is taking approximately 4+ hours every day. just refresh only records from TXN_HDR_FCT whose CUST_ID is changed or any records inserted into TXN_HDR_FCT? I read about Materialized views but not sure how can i create MV logs on 2 tables? If i use materialized views do i need to create indexes every day?
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Dec 29, 2011
I have an issue in materialized view which has got one of the null able column and query on this column taking approximately 2 mins where as other indexed columns takes less than 10 sec.
Here is the summary
SQL> Select Count (1), Count (VAT_NO) From Mv_customer;
COUNT(1) COUNT(VAT_NO)
---------------------------------
2893561 1516
If an index is created on VAT_NO will that improve the performance. What kind of index can be created considering very less number of records has got VAT_NO
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Jan 31, 2012
In search queries generally we select 10-25 columns (more can't be displayed on the screen) from 5-10 tables
Say in case of insurance related application, the search might be on policy number, policy holder's first name, policy holder's last name, region, policy type etc.
And not to many columns we are displaying on the screen, say, 4 tables have collectively 4 * 20 = 80 columns, then we are displaying say 12-15 columns with 2-3 columns have aggregates on it.
since the search criteria (e.g. first name, last name, policy number etc.) is not known till last moment it will be a generic dynamic query
Is it possible that instead we create a Materialized view with query with only joining conditions but no filter conditions and selecting only columns to be displayed on the screen and then we will refresh the materialized view (to take care of recent business transactions) and fire refined query with filter criteria on this materialized view
Select col1,col2,col3,col4,col5
From tab1,tab2,tab3,tab4
Where tab1.col1=tab2.col1
And tab2.col2=tab3.col2
And tab2.col2=tab4.col2;
Will it improve performance of the search functionality
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Sep 10, 2010
A scheduler job is there to refresh some materialized views. All the views are run under single job name. Some mviews are not refreshing and those are not refreshing in the next run too.if we run those mviews manually then they are working fine from then . after some days those views which i told before are not refreshing and this happens frequently and i check the job_run_details views also and i am not seeing any errors in that.
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May 24, 2011
I created a materialized view which takes around 6 hrs to refresh. way to reduce the refresh time.The query is:
create materialized view ERC_DAILY_DISBURSMENT_MIS_VIEW
refresh complete on demand as
with disb_qur as (select e.account_no,
e.journal_dt,
e.instr_amt disbursed_amt,
[code]....
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Jun 20, 2011
i have created a fast refresh materialized view but it is not performing fast refresh or even complete refresh.Then i have checked my materialized view capabilities then in mv_capabilities_table i got a message that materialized view log is newer than old .
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Sep 12, 2008
I have attempted to set up the materialized view below to refresh complete at the time specified below. The problem is that it does not refresh and pick up the changes to one of the base tables.
When I issue the command:
exec DBMS_REFRESH.REFRESH('TEAMSITE3.FIRMSEARCH_COWS_MV ');
the refresh works..
why this view is not refreshing at the time stated??
CREATE MATERIALIZED VIEW FIRMSEARCH_COWS_MV
REFRESH COMPLETE START WITH to_date('11-09-2008 10:00:00','dd-MM-yyyy hh24:mi:ss') NEXT (SYSDATE+1)
AS SELECT distinct spar.COW_REF
FROM LV_RECOGNISED_ATTAINMENTS lra,
LV_POSITION_IN_ORGANISATIONS rio,
[code]....
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Jun 30, 2011
how to Refresh materialized view by other user than owner.option is there to give drop any view/table grant to other user. But can't do this as it's a system privileges.
Is there any option to refresh a view without dropping the structure?
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Nov 22, 2007
Have some issue with Materialized view refresh. Have presented scenario which we have .
Schema1 :
1. Have base tables
2. Created MV logs on base tables
Schema2 :
1. Created sysnonyms for Schema1 base tables
2. created Materialized views
3. Created MV group , added views to the group
Executing the below command in schema2 :
execute dbms_refresh.refresh('MV_grp');
Error :
ORA-12048: error encountered while refreshing materialized view
"Schema2"."Table1_MV"
ORA-12018: following error encountered during code generation for
"Schema2"."Table1_MV
"ORA-00942: table or view does not exist
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 2255
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 2461
ORA-06512: at "SYS.DBMS_IREFRESH", line 683
ORA-06512: at "SYS.DBMS_REFRESH", line 195
ORA-06512: at line 1
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Jul 12, 2012
DB_VERSION=10.2.0.4
OS_VERSION=Windows 2008 R2
RAM_SIZE=32 GB
We have 2 production (OLTP) database( DB1 (18GB) and DB2 (200GB) ) on a server out of which DB2 database has almost 20 Materalized Views all (REFRESH FORCE ..ON DEMAND).
I have already informed the client that this is not the OLAP database where you are going to make use of the M Views for reporting purpose. However currently the client does not have any alternative.
Breif details :-
Out of 20 M Views 3 refresh once a week and where as the rest refresh every night daily.
We are currently testing a new website for which we had to re-schedule all M Views from their Old timings to New Timings i.e. Daily Basis.
But post re-scheduling the database performance was badly degarded as the database was too slow also the number of archives increasted to 300GB which was earlier 100 GB.To resolve the issue , we had to go back to the old timings and the database is currently working fine.
Requirement :-Client is looking out for an alternative solution as he needs to once again change the M View refresh time i.e. Daily Refresh.We already have 2 Oracle Instance on the server
Questions :-
1. Can i create another database ( sayTESTDB2 ) in no archivelog mode and create a db link to reduce the load on the server ?
2. If Yes .. Then is there any relavent link /example or Metalink Note ID for the same??
3. What all parameters do i need to consider while creating a DB Link ?
3. Out of 32 GB RAM , I have given 4GB and 8GB sga_max to DB1 and DB2 Respectively . Also the cpu utilization is normally 50-%60%.
Since currently we do not have any Licence for other server .. Can i make use of the same server ( i.e. creating 3 rd Oracle Instance )?
Since the main intention of this activity is reduce the load from the DB2 onto TESTDB when the daily refresh has set once again
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May 21, 2013
I have lots of materialized views and I want to refresh it manually every weekend (Sunday).
I tried :
SQL> refresh materialize view model_type_mv;
SP2-0734: unknown command beginning "refresh ma..." - rest of line ignored.
I am missing something?
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Jul 28, 2013
we need to create a materialized view which should do complete refresh at pre determined interval like - 6am,12pm and 4pm every day.
Is it possible to have this option in materialized view?
As of now, I could understand we can do "start with" and "next" option which will schedule refresh with same interval but not with different time interval which I mentioned above.
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Jun 4, 2011
I have created a fast refresh materialized view.now i wanted to know my materialized view how long processing for refresh.which table stores this information with syntax.
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Jun 29, 2011
i have created a fast refresh materialized view but it is not performing any refresh.Then i have checked my materialized view capabilities in mv_capabilities_table i got a message that" materialized view log is newer than last full refresh".
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Dec 22, 2005
How can i use refresh option as 1 hr in creation of materialized view, Can i use unoin all in the materialized view and other clause like CONNECT BY PRIOR .
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Feb 8, 2012
I'm trying to build up a materialized view with aggregate and FAST REFRESH for INSERT and UPDATE, DELETE with no success. But the web doesn't deny it ?
--build up needed schema objects
CREATE TABLE empt
( ename VARCHAR2(20),
empno INTEGER,
[Code]....
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Sep 10, 2013
My materialized view has to get refreshed as part of a scheduled package. When I refresh the materialized view manually using the following statement,
DBMS_MVIEW.REFRESH('info.sales_fact_load_mv', 'C');
it is working fine. However, when I use the same statement in the package which is scheduled to run every morning, it is not working. What could be the reason?
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Feb 7, 2012
I have created a Table with one column in user 'Test' Database 'Test'. Then i have created a Materialized view based on the Table in 'TestMV' in same database 'Test'.working fine. But after adding one column in the table, if i go to refresh the Materialized view the following Error has occured.
ERROR at line 1:
ORA-12008: error in materialized view refresh path
ORA-00913: too many values
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 2256
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 2462
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 2431
ORA-06512: at line 2
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Dec 11, 2012
i want to find out the last refresh elasped time for materialized view. i do not see last refresh elapsed time in data dictionary. i see only last refresh date in data dictionary.
how to find the last refresh elapsed time for materialized view.
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Apr 17, 2008
I created materialized view in Database B. The master table is in Database A. If i shutdown the database B and bring it up again, the next refresh time in dba_jobs tablein database A is coming as 01-jan-00. It is not getting refreshed automatically. The job_queue_process is 10. wat could be the reason, for the refresh failure.
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Jun 17, 2010
We are planning to create a materialized view on 5 tables and 2 views. After first complete refresh we want to do Fast refresh going forward and planning to create view log for base tables. Since the SQL uses two views, we can create view-log for its underlying tables. But will that work ? In case of fast refresh ? or it will still go for complete refresh ?
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Jul 18, 2013
I am trying to create a commit on refresh materialized view so that whenever I perform DML followed by commit on Master table it should get quickly reflect on my Materialized view. I have given SELECT on table privilege to user where this view will be created On Master:
GRANT SELECT ON HR.EMPLOYEES TO SCOTT. From Scott:CREATE MATERIALIZED VIEW scott.hremp REFRESH FAST ON COMMITAS SELECT * FROM HR.EMPLOYEES; ERROR at line 4:ORA-01031: insufficient privileges Then I Grant all on EMPLOYEES table to SCOTT. GRANT ALL ON hr.EMPLOYEES TO SCOTT; Then got following error while creating materilized view:SQL> CREATE MATERIALIZED VIEW scott.hremp 2 REFRESH FAST ON COMMIT 3 AS 4 SELECT * FROM HR.EMPLOYEES;SELECT * FROM HR.EMPLOYEES *ERROR at line 4:ORA-23413: table "HR"."EMPLOYEES" does not have a materialized view log I create materialized view log on Master:SQL> CREATE MATERIALIZED VIEW LOG on HR.EMPLOYEES;Materialized view log created.
Even after this I am not able to create materialized view and now getting Table not Exist error:
SQL> CREATE MATERIALIZED VIEW scott.hremp 2 REFRESH FAST ON COMMIT 3 AS 4 SELECT * FROM HR.EMPLOYEES;SELECT * FROM HR.EMPLOYEES *ERROR at line 4:ORA-12018: following error encountered during code generation for "SCOTT"."HREMP"ORA-00942: table or view does not exist. Also I want to know why I needed to GRANT ALL to HR for creating this materialized View.
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Nov 1, 2012
The customer moved their database from 10g to a 11gR2 database.They created the MV in the new system and now it takes 26 hours to refresh as opposed to 15 min in the old 10g database.Just looking for a game plan for troubleshooting.
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Jan 6, 2010
I am working on materialized view replication but i have an crucial issue. I have a refresh group which contain many MVs some are Read only and some are update but all are in Fast refresh mode (logs are created on both replication and MV sites on these objects) and are referentially integrated to each other i.e they have parent child relationship with each other as at replication site on base tables.
When refresh group job runs to refresh these MVs i got the errors
ORA-02292: integrity constraint (string.string) violated - child record found
After that job status has changed to break,but in the same time all the pending transactions at the MVs sites are pushed to Replication site i e ( Base tables at replication site and MVs of these tables are synchronized).In order to change the status of job to Normal, i have to disable some constraints(not all) on the MVs and manually run the job .After that job status will become Normal even i enable these constraints with validation.
What will be the reason ? Are there some MVs trying to complete refresh instead of Fast or increment refresh in this refresh group?If yes how i can trace out MVs and solve this problem?
Some other information ,
Replication site running with 10gR2 Enterprise Edition.
Materialized View site running with 10gR2 Slandered Edition.
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Mar 6, 2013
I have a view that includes sub queries in its select.
I am creating a MV over that view. and i want to fast refresh it when ever a commit is placed on the table (that is used in the from clause for the simple view)
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Apr 3, 2013
One table is partitioned. Below are my steps.
********************************************************************************************************
EXECUTE Dbms_Redefinition.can_redef_table('USRTEST2','ASH_PART_EMP');
CREATE TABLE USRTEST2.ASH_PART_EMP_PART
(
EMPNO NUMBER,
NAME VARCHAR2(30 BYTE),
[code].....
>> just after this command, below error occurred.
*****************************************************************************
ORA-12008: error in materialized view refresh path
ORA-14400: inserted partition key does not map to any partition
ORA-06512: at "SYS.DBMS_REDEFINITION", line 50
ORA-06512: at "SYS.DBMS_REDEFINITION", line 1343
ORA-06512: at line 2
********************************************************************************
I am unable to UNDERSTAND, why this error is appearing? I have created new tablespace, new user, new table, then, from where this MATERIALIZED view error is coming?
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Sep 26, 2013
create materialized view ino_crm.MV_IDENTIFICATION_DETAILS REFRESH FAST as SELECT billing_account_id, i.s1 KEYS_ , COALESCE(i.s2, i.b, i.d) VALUES_ FROM ba_personal_details pd , xmltable ( '//entry[string = "identification Details"]//entry' passing xmltype(pd.details) columns s1 VARCHAR2 (255) path 'string[1]' ,s2 VARCHAR2(255) path 'string[2]' ,b VARCHAR2(255) path 'boolean' ,d VARCHAR2(255) path 'date' ) i WHERE pd.mandator_key = 'VSO01' AND pd.valid_to = to_date('01.01.4000', 'DD.MM.YYYY'); and
I get an exception like: SQL Error: ORA-12015: cannot create a fast refresh materialized view from a complex query 12015. 00000 - "cannot create a fast refresh materialized view from a complex query"
*Cause: Neither ROWIDs and nor primary key constraints are supported for complex queries.
*Action: Reissue the command with the REFRESH FORCE or REFRESH COMPLETE option or create a simple materialized view.
I have found this URL....
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