OLAP option (materialized view)
Hi all,
At this moment i am working on a project to make a olap cube on a Oracle database. After i want to deploy the database i got the error materialized view is not on in our version of Oracle database(we use SE). I asked my manager if we could buy the EE but there is no money for that.
Now i was thinking, i saw Postgresql does support materialized view. Is it possible to deploy the olap cube on a postgresql database?
Thanks in advance for all your comments,
Daniel
Not that I am aware off, but if Postgres supports CWM metadata format you could try connecting Postgres to your Oracle instance and see if it will read the CWM catalog.
Real shame that you cannot upgrade to EE version of the database because then you could have ditched your materialized views and moved to a pure multi-dimensional model using the 10g Analytic Workspace.
Keith
Similar Messages
-
Hi,
Can OLAP cube be implemented without having ORACLE OLAP installed? As per my understanding, cubes are something which keeps aggregate data. So can I just use materialized view functionality ( which is already there in Oracle)?
Which other Oracle object can I use without installing ORACLE OLAP ( Dimension etc?)
Thanks a lot.
NitinIf you mean by implementing an OLAP cube, you mean setting up reports for various summary level data analysis, it is possible to query materialized views to get the same data in some cases. A position paper that describes the advantages of the OLAP Cube v. among other things standard materialized views may be found at this URL: http://www.oracle.com/technetwork/database/options/olap/olap-wp-12c-1896136.pdf?ssSourceSiteId=ocomen
I also would recommend posting this question on the general database forum (General Database Discussions) as well.
Hope this helps,
Ken Chin -
Materialized View with No Logging Option;;; THX
Hi all,
What's the diffrence between a :
Materialized View with No Logging Option
Materialized View with Logging Option
thank youLOGGING|NOLOGGING specifies that subsequent Direct Loader (SQL*Loader) and direct-load INSERT operations against a nonpartitioned index, a range or hash index partition, or all partitions or subpartitions of a composite-partitioned index will be logged (LOGGING) or not logged (NOLOGGING) in the redo log file.
In NOLOGGING mode, data is modified with minimal logging (to mark new extents invalid and to record dictionary changes). When applied during media recovery, the extent invalidation records mark a range of blocks as logically corrupt, because the redo data is not logged. Therefore, if you cannot afford to lose this index, you must take a backup after the operation in NOLOGGING mode.
If the database is run in ARCHIVELOG mode, media recovery from a backup taken before an operation in LOGGING mode will re-create the index. However, media recovery from a backup taken before an operation in NOLOGGING mode will not re-create the index.
An index segment can have logging attributes different from those of the base table and different from those of other index segments for the same base table.
Message was edited by:
HAGGAR -
Regd FAST refresh option in a Materialized view
Hi All,
I am using a pipeline function in which I am creating a table of records and a few cursors to fetch data from various tables.
Now this PL/SQL table is being used to construct a Materialized view.
Creation of Materialized view is happening fine but not with FAST refresh option. It gives an error " Cannot create a FAST refresh Materialized view from a complex query."
The query which I have used for the view creation is
CREATE MATERIALIZED VIEW CUSTOM.ABC
PCTFREE 0
BUILD IMMEDIATE
REFRESH FAST ON DEMAND
AS
SELECT A.Number,
A.Guarantors_Number,
A.Guarantors_Name,
A.Personal_Garantee_PCNT,
A.Company, LG.Source_System,
A.Type_of_Info,
A.File_Gen_Date,
A.Periodicity
FROM
TABLE(CUSTOM.CDM_LG_PACK_PF.CDM_LG_FUNC) A;
where CDM_LG_PACK_PF is the package and CDM_LG_FUNC is the pipeline function I have written to fetch all the records.
Please help me on how can I do a FAST refresh on this materialized view.
Thanks in advance,
GauravWelcome to the forum!
FAST refresh doesn't mean that the operation is fast (time wise), it means it's an incremental refresh.
If you have a complex query, you can't use a FAST refresh - that's what the exception tells you. -
Logging option in materialized view
Hi all,
Anyone know about the meaning of "Logging option"(LOGGING, NOLOGGING) in Materialized view of node Snapshot in Oracle enterprise manager(Warehouse -->Summary management -->Materialized view(snapshot))
Pls explain me.
Thank you
Mckahttp://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14200/clauses005.htm#i999782
-
Materialized views - query rewrite -- optional joins & dimensions
Hi,
I've implemented a number of materialized views that are accessible via query rewrite.
Most of these views make use of duplicate tables (DD_TIME table is joined via purchase, load, process, ... date columns)
I've also created a dimension to make Oracle aware of the time relation (month is child of year...)
The issue:
--> If I create the mat. view with inner joins, query rewrite works with the dimensions, but I need to provide ALL joined tables in the query
--> If I create the mat. view with outer joins, query rewrite works even with 1 joined table, but the dimension seems to be ignored
How can I create 'optional' joins in the Mat. View while making use of dimensions for rollup?
(the limitations on materialized view delta joins mentioned on [oracle docs|http://docs.oracle.com/cd/B28359_01/server.111/b28313/qradv.htm#autoId16] kinda has me worried)
Example Mat. View:
CREATE MATERIALIZED VIEW DA_REPOSITORY_MERCHANT_MM
... ENABLE QUERY REWRITE
AS SELECT
DDFPC.YEAR_NO,
DDFPC.YEAR_MONTH,
DDPUR.YEAR_NO,
DDPUR.YEAR_MONTH,
SUM( DF.TRANSACTION_AMOUNT )
FROM DF_REP DF,
DD_TIME DDFPC,
DD_TIME DDPUR
WHERE DF.FPC_DTE = DDFPC.DAY_DATE(+)
AND DF.PUR_DTE = DDPUR.DAY_DATE(+)
GROUP BY
DDFPC.YEAR_NO,
DDFPC.YEAR_MONTH,
DDPUR.YEAR_NO,
DDPUR.YEAR_MONTH
Example query launched:
SELECT
DDFPC.YEAR_NO,
SUM( DF.TRANSACTION_AMOUNT )
FROM DF_REP DF,
DD_TIME DDFPC
WHERE DF.FPC_DTE = DDFPC.DAY_DATE
GROUP BY
DDFPC.YEAR_NOThe problem was resolved by setting foreign keys in the fact table and making them not nullable + using inner joins.
--> this informs oracle there can be no difference between a query without the dimensions and a query with the dimensions.
As a result, the materialized view can contain 1 fact linked to 2 dimension tables, but the query rewrite will work for queries on the 1 fact joined with only 1 dimension -
MATERIALIZED VIEW WITH ROWID OPTION
Hi All I need to create a materialized view on a table that does not have a PK defined. Reading around, I have to create a MV using the WITH ROWID option and no other fancy options. I cant seem to find a simple snytax example?! Also do I have to create a log.
Below is the error I got from the table that does not have a PK defined on project_id
Error
SQL> CREATE MATERIALIZED VIEW xxca_project_status_mv
2 WITH ROWID
3 AS
4 SELECT ppa.rowid
5 , ppa.project_id
6 , ppa.project_status_code
7 FROM apps.pa_projects_all ppa
8 /
WITH ROWID
ERROR at line 2:
ORA-00905: missing keyword
Any help on this greatly appreciated!
SatnamWITH ROWID is used with REFRESH clause. Try
SQL> CREATE MATERIALIZED VIEW xxca_project_status_mv
2 REFRESH WITH ROWID
3 AS
do I have to create a log.Only if you want a fast refresh. -
Materialized View with OLAP table function
Hi,
I am trying to materialize OLAP cubes into relational materialized views which works quite fine. After a few loadings in background in parallel with Database Jobs and DBMS_MVIEW package the peformance is getting poor. Steps I am performing:
1. Generate materialized view as DEFERRED and COMPLETE refresh
2. Generate database Jobs for refreshing views with DBMS_MVIEW.REFRESH function
3. Running Jobs in background
I have loading times the first time 10min after then over 4 hours. I also tried with ATOMIC_REFRESH=FALSE but the same result. Database is running in ARCHIVE LOGGING. Can this degrade the performance?
Any ideas?
Thanks,
ChristianHi,
yes thats correct. I am creating MVs in 10.2.0.3
Here is an example:
CREATE MATERIALIZED VIEW "FCRSGX"."MV_F_ICCC_C11"
ORGANIZATION HEAP PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 COMPRESS NOLOGGING
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
TABLESPACE "FCRSGX_CONSO_RELATIONAL"
BUILD DEFERRED
USING INDEX
REFRESH COMPLETE ON DEMAND
USING DEFAULT LOCAL ROLLBACK SEGMENT
DISABLE QUERY REWRITE
AS SELECT ENTITY, REVE_ICC, RP_ICC, MV_ICC, PERIOD, MEASURE, AMOUNT, R2C
FROM TABLE(OLAP_TABLE('FCRSGX.CONSODATA DURATION SESSION',
DIMENSION ENTITY as varchar2(8) FROM ENTITY
DIMENSION REVE_ICC as varchar2(8) FROM REVE_ICC
DIMENSION RP_ICC as varchar2(8) FROM RP_ICC
DIMENSION MV_ICC as varchar2(8) FROM MV_ICC
DIMENSION PERIOD as varchar2(8) FROM GMONTH
DIMENSION MEASURE as varchar2(30) FROM EXPR
MEASURE AMOUNT as number FROM ICCC.C11
LOOP CMPE.ICCC.C11
ROW2CELL R2C '))
WHERE OLAP_CONDITION(r2c, 'lmt entity to CMPE.ICCC.C11')=1
AND OLAP_CONDITION(r2c, 'lmt reve_icc to CMPE.ICCC.C11')=1
AND OLAP_CONDITION(r2c, 'lmt mmonth to sapload.per eq y')=1
AND OLAP_CONDITION(r2c, 'lmt gmonth to charl(mmonth) ')=1
AND OLAP_CONDITION(r2c, 'lmt rp_icc to CMP.ICCC.C11 ')=1
AND OLAP_CONDITION(r2c, 'lmt mv_icc to CMP.ICCC.C11 ')=1
AND OLAP_CONDITION(r2c, 'lmt expr to ''F.ICCC.C11'' ')=1
MODEL
DIMENSION BY(ENTITY,REVE_ICC,RP_ICC,MV_ICC,PERIOD,MEASURE)
MEASURES(AMOUNT,R2C)
RULES UPDATE SEQUENTIAL ORDER()
; -
I have read the documentation. I know you can specify options such as 'with primary key' and/or 'with rowid' when creating a materialized view log. Also, that you can specify to include additional columns in the log -and that these can then be seen in the MLOG$ table that gets created. But I don't know why or in what circumstances you'd specify the one or the other, or include columns or not. Can anyone give some example scenarios where you'd do one or the other?
Hello again,
The fundamental reason (why you would specify primary key and/or ROWID) is to facilitate fast refreshes (as opposed to a complete refresh) of the materialized view -- a lot will depend on the MV query itself, and whether one or both of primary key & ROWID are needed, i.e., if there's a COUNT(*) involved, where the primary key would play a role, or without such an aggregate, the ROWID will be necessary (in any case) for fast refresh.
Edited by: SeánMacGC on Jul 9, 2009 5:54 PM
If you run the utlxmv.sql script in $ORACLE_HOME/rdbms/admin, that will create the MV_CAPABILITIES_TABLE, which when you create an MV and execute DBMS_MVIEW.EXPLAIN_MVIEW('your_mview') will populate that with what that MV is capable of, i.e.,
SQL> desc mv_capabilities_table;
Name Null? Type
STATEMENT_ID VARCHAR2(30)
MVOWNER VARCHAR2(30)
MVNAME VARCHAR2(30)
CAPABILITY_NAME VARCHAR2(30)
POSSIBLE CHAR(1)
RELATED_TEXT VARCHAR2(2000)
RELATED_NUM NUMBER
MSGNO NUMBER(38)
MSGTXT VARCHAR2(2000)
SEQ NUMBER
SQL> select capability_name, possible from mv_capabilities_table;
CAPABILITY_NAME P
PCT N
REFRESH_COMPLETE Y
REFRESH_FAST N
REWRITE N
PCT_TABLE N
REFRESH_FAST_AFTER_INSERT N
REFRESH_FAST_AFTER_ONETAB_DML N
REFRESH_FAST_AFTER_ANY_DML N
REFRESH_FAST_PCT N
REWRITE_FULL_TEXT_MATCH N
REWRITE_FULL_TEXT_MATCH N
REWRITE_PARTIAL_TEXT_MATCH N
REWRITE_PARTIAL_TEXT_MATCH N
REWRITE_GENERAL N
REWRITE_GENERAL N
REWRITE_PCT N
PCT_TABLE_REWRITE N -
Is it any option for Incremental Refreshing of Materialized Views..
Hi All,
Is anyone have any idea about Incremental refrshing of Materialized views.
I mean i dont want to every time full refershing of MV its taking huge time.I am looking any incremental refrshing options for MViews.
Is it any options available n Oracle 9i/10g ?
Thanks n advance.
AnwarUse theREFRESH FAST ON COMMIT option
Example Steps
1. Create Materialized View Log
CREATE MATERIALIZED VIEW LOG ON table_name
WITH ROWID
Col1
Col2
Col...
INCLUDING NEW VALUES
2. Create the Materialized View using the above[b] table_name in the SELECT
CREATE MATERIALIZED VIEW mv_name
REFRESH FAST ON COMMIT
WITH ROWID
AS
SELECT xxxxx
Read more on this from SQL Reference Manual -
A bug when refreshing a materialized view?
I am getting "ORA-00603: ORACLE server session terminated by fatal error" upon refresh of a materialized view. I've put together a test case to demonstrate the problem. Is it a bug?
SQL*Plus: Release 10.1.0.3.0 - Production on Fri Jul 29 13:43:45 2005
Copyright (c) 1982, 2004, Oracle. All rights reserved.
Connected to:
Oracle9i Enterprise Edition Release 9.2.0.6.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.6.0 - Production
[email protected]> create table t (
2 id int primary key,
3 t_name varchar2(10),
4 t_date date
5 );
Table created.
[email protected]> create materialized view log on t
2 with rowid (t_name, id, t_date) including new values;
Materialized view log created.
[email protected]> create materialized view t_mv
2 build immediate
3 refresh fast
4 on commit
5 as
6 select t_name, max(id) id, max(t_date) t_date, count(*)
7 from t
8 GROUP BY t_name;
Materialized view created.
[email protected]> create materialized view log on t_mv
2 with rowid (id) including new values;
Materialized view log created.
[email protected]> create table v (
2 id int primary key,
3 t_id int references t(id) on delete cascade,
4 v_name varchar2(10)
5 );
Table created.
[email protected]> create materialized view log on v
2 with rowid (v_name, t_id) including new values;
Materialized view log created.
[email protected]> create materialized view v_mv
2 build immediate
3 refresh fast
4 on commit
5 as
6 select v.rowid rowid1, t_mv.rowid rowid2, v.v_name, v.t_id
7 from v, t_mv
8 where v.t_id = t_mv.id;
Materialized view created.
[email protected]> alter table v_mv
2 add constraint v_mv_uk1 unique
3 (
4 v_name
5 )
6 enable
7 ;
Table altered.
[email protected]> insert into t (id, t_name, t_date) values (1, 'A', sysdate);
1 row created.
[email protected]> insert into t (id, t_name, t_date) values (2, 'B', sysdate);
1 row created.
[email protected]> insert into t (id, t_name, t_date) values (3, 'A', sysdate);
1 row created.
[email protected]> insert into t (id, t_name, t_date) values (4, 'A', sysdate);
1 row created.
[email protected]> insert into t (id, t_name, t_date) values (5, 'B', sysdate);
1 row created.
[email protected]> insert into v (id, t_id, v_name) values (1, 1, 'V_A_1');
1 row created.
[email protected]> insert into v (id, t_id, v_name) values (2, 2, 'V_B_1');
1 row created.
[email protected]> insert into v (id, t_id, v_name) values (3, 3, 'V_A_2');
1 row created.
[email protected]> insert into v (id, t_id, v_name) values (4, 4, 'V_A_3');
1 row created.
[email protected]> insert into v (id, t_id, v_name) values (5, 5, 'V_B_2');
1 row created.
[email protected]> commit;
Commit complete.
[email protected]> insert into t (id, t_name, t_date) values (6, 'A', sysdate);
1 row created.
[email protected]> insert into v (id, t_id, v_name) values (6, 6, 'V_B_2');
1 row created.
[email protected]> commit;
commit
ERROR at line 1:
ORA-12008: error in materialized view refresh path
ORA-00001: unique constraint (FESA.V_MV_UK1) violated
[email protected]> -- ORA-12008 is fine here: that's what was expected
[email protected]> delete from t where id = 5;
1 row deleted.
[email protected]> commit;
ERROR:
ORA-03114: not connected to ORACLE
commit
ERROR at line 1:
ORA-00603: ORACLE server session terminated by fatal errorWhy ORA-00603?
Best regards,
MaciejIt may be a bug, or it may be a result of the dependencies between the materialized views. I don't have a 9.2.0.6 instance that I'm willing to trash to test this, but this is what I get on 9.2.0.1.
If it is a bug they at least changed the behaviour of the bug in 9.2.0.6.
I ran your script up to the first commit then did:
SQL> SELECT * FROM t;
ID T_NAME T_DATE
1 A 29-JUL-05
2 B 29-JUL-05
3 A 29-JUL-05
4 A 29-JUL-05
5 B 29-JUL-05
SQL> SELECT * FROM t_mv;
T_NAME ID T_DATE COUNT(*)
A 4 29-JUL-05 3
B 5 29-JUL-05 2
SQL> SELECT * FROM v;
ID T_ID V_NAME
1 1 V_A_1
2 2 V_B_1
3 3 V_A_2
4 4 V_A_3
5 5 V_B_2
SQL> SELECT * FROM v_mv;
no rows selectedHUH?? But:
SQL> SELECT v.rowid rowid1, t_mv.rowid rowid2, v.v_name, v.t_id
2 FROM v, t_mv
3 WHERE v.t_id = t_mv.id;
ROWID1 ROWID2 V_NAME T_ID
AAAH4QAAIAAAAl1AAD AAAH4MAAIAAAAlFAAA V_A_3 4
AAAH4QAAIAAAAl1AAE AAAH4MAAIAAAAlFAAB V_B_2 5So, I tried:
SQL> EXEC DBMS_MVIEW.REFRESH('V_MV');
PL/SQL procedure successfully completed.
SQL> SELECT * FROM v_mv;
no rows selectedNow, this is confusing, so:
SQL> EXEC DBMS_MVIEW.REFRESH('V_MV', 'COMPLETE');
PL/SQL procedure successfully completed.
SQL> SELECT * FROM v_mv;
ROWID1 ROWID2 V_NAME T_ID
AAAH4dAAIAAAAl1AAD AAAH4ZAAIAAAAlFAAA V_A_3 4
AAAH4dAAIAAAAl1AAE AAAH4ZAAIAAAAlFAAB V_B_2 5So at least I've got something in the MV. Now, to continue your test:
SQL> insert into t (id, t_name, t_date) values (6, 'A', sysdate);
1 row created.
SQL> insert into v (id, t_id, v_name) values (6, 6, 'V_B_2');
1 row created.
SQL> COMMIT;
Commit complete.I also expected the error but no joy, and look at this:
SQL> SELECT * FROM v_mv;
ROWID1 ROWID2 V_NAME T_ID
AAAH4dAAIAAAAl1AAE AAAH4ZAAIAAAAlFAAB V_B_2 5Forcing the refresh on v_mv gets:
SQL> EXEC DBMS_MVIEW.REFRESH('V_MV', 'COMPLETE');
BEGIN DBMS_MVIEW.REFRESH('V_MV', 'COMPLETE'); END;
ERROR at line 1:
ORA-12008: error in materialized view refresh path
ORA-00001: unique constraint (OPS$ORACLE.V_MV_UK1) violatedVery strange! It gets better:
SQL> DELETE FROM t WHERE id = 5;
1 row deleted.
SQL> commit;
Commit complete.
SQL> EXEC DBMS_MVIEW.REFRESH('V_MV', 'COMPLETE');
PL/SQL procedure successfully completed.
SQL> select * from v_mv;
ROWID1 ROWID2 V_NAME T_ID
AAAH4dAAIAAAAl1AAF AAAH4ZAAIAAAAlFAAA V_B_2 6 But:
SQL> SELECT * FROM t_mv;
T_NAME ID T_DATE COUNT(*)
A 6 29-JUL-05 4
B 5 29-JUL-05 2
SQL> SELECT * FROM t;
ID T_NAME T_DATE
1 A 29-JUL-05
2 B 29-JUL-05
3 A 29-JUL-05
4 A 29-JUL-05
6 A 29-JUL-05Obvioulsy, something is not fast refreshing. So lets force it:
SQL> EXEC DBMS_MVIEW.Refresh('T_MV', 'COMPLETE');
PL/SQL procedure successfully completed.
SQL> SELECT * FROM t_mv;
T_NAME ID T_DATE COUNT(*)
A 6 29-JUL-05 4
B 2 29-JUL-05 1
SQL> SELECT * FROM v_mv;
ROWID1 ROWID2 V_NAME T_ID
AAAH4dAAIAAAAl1AAB AAAH4qAAIAAAAlEAAB V_B_1 2
AAAH4dAAIAAAAl1AAF AAAH4qAAIAAAAlEAAA V_B_2 6Which looks right to me.
Then, I blew everything away and did it allagain up to an including the inserts into t, then I inserted into v and commited. Now, both MV's were correct, so I did:
SQL> insert into t (id, t_name, t_date) values (6, 'A', sysdate);
1 row created.
SQL> insert into v (id, t_id, v_name) values (6, 6, 'V_B_2');
1 row created.
SQL> commit;
Commit complete.
SQL> SELECT * FROM t_mv;
T_NAME ID T_DATE COUNT(*)
A 6 29-JUL-05 4
B 5 29-JUL-05 2Still strange, so blow it all away again insert into t commit, insert into v commit, then:
SQL> insert into t (id, t_name, t_date) values (6, 'A', sysdate);
1 row created.
SQL> commit;
Commit complete.
SQL> insert into v (id, t_id, v_name) values (6, 6, 'V_B_2');
1 row created.
SQL> commit;
commit
ERROR at line 1:
ORA-12008: error in materialized view refresh path
ORA-00001: unique constraint (OPS$ORACLE.V_MV_UK1) violatedAt least now it sees the error at commit time for v so lets try the delete:
SQL> delete from t where id = 5;
1 row deleted.
SQL> commit;
Commit complete.
SQL> SELECT * FROM t_mv;
T_NAME ID T_DATE COUNT(*)
A 6 29-JUL-05 4
B 5 29-JUL-05 2
SQL> SELECT * FROM t;
ID T_NAME T_DATE
1 A 29-JUL-05
2 B 29-JUL-05
3 A 29-JUL-05
4 A 29-JUL-05
6 A 29-JUL-05Still not actually refreshing somehow.
I may play with this some more, it seems truly strange to me.
John -
Need advise : Risks of using materialized views
Hi -
I need some advise on whether using a materilzied view can help in teh folloiwng scenario.
Scenario : You have a large tables which has sy 60 million rows, This is a demand management application which accesses this data at various aggregate levels (It is not using any OLAP functionality). The worksheets that is used to display the data takes up hours to execute on.
To solve teh above scenario I created partitions on the base table say by time and the on top I created some materialized views. This gave me tremendoud gain in performance for the worksheets.
Question is : Will Materialzied views help in situations say where the user changes the data in the worksheet and another user tries to query the changes will the materialized view be able to show the changes or do I need enforce a fast refresh. all the standard option of enabling query rewrite and fast refresh are enabled. The parameter for query_rewrite_integrity is set to Trusted.
Please advise what could be teh pitfalls in managing such huge data where some of it changes infrequently.Hi Arch,
Will Materialzied views help in situations say where the user changes the data in the worksheet and another user tries to query the changes will the materialized view be able to show the changes or do I need enforce a fast refresh.That depends on your "stale tolerance":
http://www.dba-oracle.com/t_materialized_view_fast_refresh_performance.htm
pitfalls in managing such huge data where some of it changes infrequently. If it does not change frequently, then it's just a matter of extra disk space for the materializations. I have more notes here:
http://www.dba-oracle.com/t_finding_materialized_view_contents.htm
Hope this helps. . .
Don Burleson
Oracle Press author
Author of “Oracle Tuning: The Definitive Reference”
http://www.dba-oracle.com/bp/s_oracle_tuning_book.htm -
Fast refresh of materialized view
Hi All,
This is my first posting on this forum, so I hope I don't step on anyone's toes as I wade into a problem that I am experiencing.
I have a number of either join-only or single table aggregate materialized views that I have experienced problems with. All the views are setup for FAST REFRESH ON DEMAND but I'm hitting an error if I execute a COMPLETE refresh of the view when I've done an ALTER SESSION ENABLE PARALLEL DML. The error I get is:
ERROR at line 1:
ORA-30439: refresh of 'DTKTGT.CTNS_PER_HR_VOL_AGG_MV' failed because of ORA-32320: REFRESH FAST of "DTKTGT"."CTNS_PER_HR_VOL_AGG_MV" unsupported after cointainer table PMOPs
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 814
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 872
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 852
ORA-06512: at "DTKTGT.MV_REFRESH", line 21
ORA-06512: at line 2
Any help anyone could provide would be greatly appreciated as every now and then, a COMPLETE refresh is unavoidable and using the ENABLE PARALLEL DML makes the refresh run a lot faster than without the ALTER SESSION.
GaryThis forum only is for questions relating to the use of OLAP Option. I would post your question on the database forum.
Keith Laker
Oracle Data Warehouse Product Management
OLAP Blog: http://oracleOLAP.blogspot.com/
OLAP Wiki: http://wiki.oracle.com/page/Oracle+OLAP+Option
DM Blog: http://oracledmt.blogspot.com/
OWB Blog : http://blogs.oracle.com/warehousebuilder/
OWB Wiki : http://wiki.oracle.com/page/Oracle+Warehouse+Builder
DW on OTN : http://www.oracle.com/technology/products/bi/db/11g/index.html -
Fast Refresh on Materialized View With Join
Hi All,
i have created following Materialized View Logs and MV
on EMP and DEPT
CREATE MATERIALIZED VIEW LOG ON DEPT
WITH PRIMARY KEY,SEQUENCE
INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON EMP
WITH PRIMARY KEY,SEQUENCE
INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW EMP_MVW
TABLESPACE OSMIS_REPORT_DATA
REFRESH FAST ON COMMIT
AS
SELECT A.EMPNO,A.ENAME,A.DEPTNO,A.JOB,A.MGR,A.HIREDATE,A.SAL,A.COMM,B.DNAME,B.LOC
FROM EMP A,DEPT B
WHERE A.DEPTNO=B.DEPTNO
The Create MV Stmnt raised following error.
ERROR at line 6:
ORA-12052: cannot fast refresh materialized view SCOTT.EMP_MVW
I have tried the same with ROWID also,but same error
while creating MV.
Pls anyone give idea to Fast Refersh on MV with Joins
Thnks
Raj.G.
mail : [email protected]Actually you can get Oracle to tell you why the view does not have the capabilities you want using the DBMS_MVIEW package. For example you could have done something like this...
Personal Oracle Database 10g Release 10.1.0.2.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL> CREATE MATERIALIZED VIEW LOG ON dept
2 WITH PRIMARY KEY, SEQUENCE
3 INCLUDING NEW VALUES;
Materialized view log created.
SQL> CREATE MATERIALIZED VIEW LOG ON emp
2 WITH PRIMARY KEY,SEQUENCE
3 INCLUDING NEW VALUES;
Materialized view log created.
SQL> CREATE MATERIALIZED VIEW emp_mvw
2 REFRESH FAST ON COMMIT
3 AS
4 SELECT a.empno, a.ename, a.deptno,
5 a.job, a.mgr, a.hiredate,
6 a.sal, a.comm, b.dname, b.loc
7 FROM emp a,dept b
8 WHERE a.deptno = b.deptno;
FROM emp a,dept b
ERROR at line 7:
ORA-12052: cannot fast refresh materialized view SCOTT.EMP_MVW
SQL> CREATE MATERIALIZED VIEW emp_mvw
2 REFRESH ON COMMIT -- remove the FAST to allow view to compile
3 AS
4 SELECT a.empno, a.ename, a.deptno,
5 a.job, a.mgr, a.hiredate,
6 a.sal, a.comm, b.dname, b.loc
7 FROM emp a,dept b
8 WHERE a.deptno = b.deptno;
Materialized view created.
SQL> @\oracle\product\10.1.0\Db_1\RDBMS\ADMIN\utlxmv.sql -- create mv_capabilities_table
Table created.
SQL> EXEC DBMS_MVIEW.EXPLAIN_MVIEW ('EMP_MVW');
PL/SQL procedure successfully completed.
SQL> SELECT capability_name, possible, msgtxt
2 FROM mv_capabilities_table
3 WHERE capability_name LIKE '%REFRESH_FAST_AFTER%';
CAPABILITY_NAME P MSGTXT
REFRESH_FAST_AFTER_INSERT N the SELECT list does not have the rowids of all the detail tables
REFRESH_FAST_AFTER_INSERT N mv log must have ROWID
REFRESH_FAST_AFTER_INSERT N mv log must have ROWID
REFRESH_FAST_AFTER_ONETAB_DML N see the reason why REFRESH_FAST_AFTER_INSERT is disabled
REFRESH_FAST_AFTER_ANY_DML N see the reason why REFRESH_FAST_AFTER_ONETAB_DML is disabled
SQL> DROP MATERIALIZED VIEW LOG ON dept;
Materialized view log dropped.
SQL> DROP MATERIALIZED VIEW LOG ON emp;
Materialized view log dropped.
SQL> DROP MATERIALIZED VIEW emp_mvw;
Materialized view dropped.
SQL> CREATE MATERIALIZED VIEW LOG ON dept
2 WITH ROWID, SEQUENCE
3 INCLUDING NEW VALUES;
Materialized view log created.
SQL> CREATE MATERIALIZED VIEW LOG ON emp
2 WITH ROWID,SEQUENCE
3 INCLUDING NEW VALUES;
Materialized view log created.
SQL> CREATE MATERIALIZED VIEW emp_mvw
2 REFRESH FAST ON COMMIT
3 AS
4 SELECT a.ROWID emp_rowid, b.ROWID dept_rowid,
5 a.empno, a.ename, a.deptno,
6 a.job, a.mgr, a.hiredate,
7 a.sal, a.comm, b.dname, b.loc
8 FROM emp a,dept b
9 WHERE a.deptno = b.deptno;
Materialized view created.
SQL> DELETE mv_capabilities_table;
18 rows deleted.
SQL> EXEC DBMS_MVIEW.EXPLAIN_MVIEW ('EMP_MVW');
PL/SQL procedure successfully completed.
SQL> SELECT capability_name, possible, msgtxt
2 FROM mv_capabilities_table
3 WHERE capability_name LIKE '%REFRESH_FAST_AFTER%';
CAPABILITY_NAME P MSGTXT
REFRESH_FAST_AFTER_INSERT Y
REFRESH_FAST_AFTER_ONETAB_DML Y
REFRESH_FAST_AFTER_ANY_DML Y
SQL> -
Fast refresh of "materialized view with joins only"
Hi,
My Requirement:
I need to create a materialized view joining two tables.
Table1 -> Does not have primary key
Table2 -> Has a primary key
I need to refesh the mat view only when DML commands are done on Table1 alone.
And it will be better if i have a Refresh on commit rather on demand.
The following code is what i used and it dint work for me:
CREATE MATERIALIZED VIEW LOG ON Table1 WITH ROWID;
CREATE MATERIALIZED VIEW LOG ON Table2;
CREATE MATERIALIZED VIEW AAYT_ETF
REFRESH FORCE ON COMMIT
ENABLE QUERY REWRITE
AS
SELECT A.rowid "table1_rowid", A.ACCTNUM, A.CORR_NUM, A.OFC_NUM, A.RR_NUM, A.BUY_SELL_CDE, A.ACT_AMT, A.CSP_SYM, A.SECR_DESC, A.ACT_QTY
FROM Table1 A, Table2 G WHERE
A.CSP_NUM = G.CSP_NUM AND
G.ASST_SUB_STYP = 'ETF';
Issue Faced: In this case the refresh happends even while i do DML on Table2.
But i need the refresh only when i do DML on Table1. I also unable to create Refresh Fast Mat view.
Can anyone please tell me how to create the Materialized view Log and the Materialized view. Thanks in advance.This forum only is for questions relating to the use of OLAP Option. I would post your question on the database forum.
Keith Laker
Oracle Data Warehouse Product Management
OLAP Blog: http://oracleOLAP.blogspot.com/
OLAP Wiki: http://wiki.oracle.com/page/Oracle+OLAP+Option
DM Blog: http://oracledmt.blogspot.com/
OWB Blog : http://blogs.oracle.com/warehousebuilder/
OWB Wiki : http://wiki.oracle.com/page/Oracle+Warehouse+Builder
DW on OTN : http://www.oracle.com/technology/products/bi/db/11g/index.html
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