Do not to use the materialized view
I wonder if we've already created a materialized view, can we prefer not to use this point of view, materialized for a query? I want to say can we determine if a query uses MV and other queries don't use MV? Thank you.
Hello Indra,
I'm not completely sure about that, but you can read (with examples) concerning the indications- NO_REWRITE and REWRITE
Text over the doc links:
Council of REWRITING:
The
REWRITE
Council instructs the optimizer to rewrite a query regarding the materialized views when possible, regardless of cost. Use theREWRITE
trick with or without a display list. If you useREWRITE
with a view list and the list contains an eligible materialized view, then Oracle uses this view regardless of its cost.
Tip NO_REWRITE:
The
NO_REWRITE
Council tells the optimizer to disable the rewrite of the query to the query block, of the substitution of the definition of the parameterQUERY_REWRITE_ENABLED
.Be aware! -The
NOREWRITE
suspicion has been deprecated. Use theNO_REWRITE
hint instead.
Read here: setting QUERY_REWRITE_ENABLED
-Nordine
Tags: Database
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Experts,
I'm trying to create a YOUNG refreshable ON COMMIT MV (xyz) using a table (circuit) and quickly updateable on validation MV (abc), but get an error:
SQL error: ORA-12054: cannot set the attribute ON COMMIT refresh for the materialized view
12054 00000 - "cannot set the refresh attribute COMMIT for the materialized view.
* Cause: The materialized view did not meet the requirements for update to
moment of validation.
* Action: Specify only valid options.
1] MV abc
= MV abc defined as below =.CREATE MATERIALIZED view abc_MV
Immediate CONSTRUCTION
REFRESH QUICKLY YOU COMMIT using constraints of trust
WITH ROWID AS SELECT n.*,.
n.ROWID noderowid
node n
where n.nodetype in (1610000069,1610007267);
-Above works OK and MV connect you on table node is created successfully
=====================================================
[ 2] Circuit Board
======================================================
CREATE MATERIALIZED VIEW LOG ON Cramer.Circuit WITH SEQUENCE, ROWID ( ) -all columns of table ofcircut parentheses
INCLUDING THE NEW VALUES;
-More top works OK and MV connect you on table circuit is created successfully
======================================================
[3] trying to create MV xyz
======================================================
CREATE MATERIALIZED VIEW LOG ON cramer.abc_MV WITH SEQUENCE, ROWID ( ) -all columns of abc_MV brackets
INCLUDING THE NEW VALUES;
-Above works OK and log on ABC MV MV gets created successfully
-Problematic step below
Xyz_MV CREATE MATERIALIZED VIEW
IMMEDIATE CONSTRUCTION
REFRESH QUICKLY YOU COMMIT using constraints of trust
AS
SELECT c., c.rowid circuit_rowid, n.rowid tr_rowid
the circuit c, abc_mv n
where circuit2startnode = n.nodeid
and c.rpplanId = n.rpplanId;
==========================================================Clues on how to solve this problem and make quickly updatable ON Commit MV xyz
Thanks in advance.
Chanchal,
If you can read my original post carefully you may have noticed that all these restrictions will not apply in my case.
All,
In any case I found the solution to my problem.
There are a few additional restrictions for materialized views multilayer
Additional Restrictions for master materialized views
The following types of materialized views may not be masters of editable materialized views:
ROWID
materialized views- Complex materialized views
- Read-only materialized views
I've updated the underlying MV abc below and everything worked like a charm
CREATE MATERIALIZED view abc_MV
Immediate CONSTRUCTION
REFRESH QUICKLY YOU COMMIT using constraints of trust
IN SELECT
n.*, n.rowid noderowid, nt.rowid nodetyperowid
the node n, nodetype_m nt
where n.node2nodetype = nt.nodetypeid
and nt.nodetypeid in (1610000069,1610007267);
Note: To ADD a join without which I was getting error below (although had primary key on the table of the node)
SQL error: ORA-23415: materialized view log for "NODE" does not save the primary key
23415 00000 - "view the log for materialized \"%s\".\"%s\"does not save the primary key.
* Cause: A primary key materialized view is refreshed quickly, but the
The materialized view log does not record the primary key information.
* Action: Use CREATING MATERIALIZED VIEW LOG... Command to add a PRIMARY KEY to
start recording of the primary key information in the materialized view
Newspaper.
-
Trigger on the materialized view
Hello
I have the scenario based (Database 11 g):
There is a view materialized (PERSON), which contains the ID and NAME fields. This MV is update daily with a fast refresh.
I have a second array (NAMES), with ID and NORM_NAME. This table contains the name of the person, without special characters.
For example, for recording / * 1 BJORN * / in the PERSON table
I would check * 1 BJORN * / in table NAMES.
Problem is how to fill the NAME table after the filling of the materialized view.
I used a trigger AFTER INSERT or update, as described below, but even if I update the master table (for this purpose, update the MV), I have only to trigger inserts.
Is there a way to implement a trigger "after update" on a materialized view, or do I need another approach?
/*
create or replace TRIGGER TRG_TESTE_MV
AFTER INSERT OR UPDATE ON THE PERSON
REFERENCING OLD AS OLD AGAIN AS NEW
FOR EACH LINE
BEGIN
IF THE INSERTION
INSERT THE NAMES
VALUES
(: NEW.id,:NEW.NAME);
END IF;
IF THE UPDATE CAN
UPDATE OF NAMES
SET NAME =: NEW.NAME WHERE ID =: NEW.id;
END IF;
END;
*/
Thanks for any help
Your trigger fires, but I doubted that you will be satisfied with the results. You really need to understand how to refresh process works before you begin creating triggers of MV:
SQL > create table emp1 in select * from EMP
2.Table created.
SQL > create materialized view emp1 with rowid journal
2.Materialized view log that is created.
SQL > create materialized view emp1_mv
2 fast refresh
3 on request
4 with rowid
5 as
6 select * from emp1
7.Materialized view created.
SQL > create or replace
trigger 2 emp1_mv_biudr
3 before inserting
4 or update
5 or delete
6 on emp1_mv
7 for each line
Start 8
9 insert then dbms_output.put_line ('INSERT' |: new.ename); end if;
10 if the deletion then dbms_output.put_line ('REMOVE' |: old.ename); end if;
11 end;
12.Trigger created.
SQL > insert
2 in emp1 (empno, ename, sal)
3 values(1,'X',1000)
4.1 line of creation.
SQL > validation
2.Validation complete.
SQL > set serveroutput on
SQL > exec dbms_mview.refresh ('emp1_mv', 'f');
INSERTION OF XPL/SQL procedure successfully completed.
SQL > update emp1
2 set sal = sal + 1
3 where ename ('King', 'JONES')
4.2 lines to date.
SQL > validation
2.Validation complete.
SQL > set serveroutput on
SQL > exec dbms_mview.refresh ('emp1_mv', 'f');
INSERTION OF JONES
INSERTION OF KINGPL/SQL procedure successfully completed.
SQL > delete emp1
2 where in ename ('ALLEN', 'SMITH')
3.2 deleted rows.
SQL > validation
2.Validation complete.
SQL > set serveroutput on
SQL > exec dbms_mview.refresh ('emp1_mv', 'f');PL/SQL procedure successfully completed.
SQL >
As you can see, refresh MV updates ever. Results update underlying table to remove/insert in MV. That's why your trigger will not give the results that you expected.
SY.
-
Re: view opaque and the materialized view
Hi Experts,
I want some clarification of opaque and view view in the physical layer OBIEE materialized
-> what is the main difference between the opaque view and materialized in the RPD perspective view, we have to do this at the level of the RPD or DB.
-> I want the list of opaque opinion and materialized in the RPD view how I should do.
-> How opaque views will degrade the performance and how a materialized view will improve performance at the level of the report.
-> In scenarios that we use view opaque and the view materialized (if possible with a scenario for the best permanent basis).
Thanks in advance.
I want some clarification of opaque and view view in the physical layer OBIEE materialized
-> What is the main difference between opaque view and create the materialized view in the RPD point of view, we have to do this at the level of the RPD or DB.
Opaque views is a SQL statement that is defined in the physical layer, OBIEE will use all in the construction of a SQL query. In a way it's not different from a database view, except it is set in OBIEE only. Alternatively, you can deploy an Opaque view, which pushes its definition in the database. Read more about it here: work with physical tables, Cubes and joins - 11 g Release 1 (11.1.1)
A materialized view (MV) is a database concept where the results of a SQL statement are physicalised like a table, and therefore as OBIEE is a MV is just another physical array
-> If I want a list of the opaque views and materialized in the RPD view how I should do.
To find opaque views, use the function «Repository of applications» administration tool Search physical Tables and set up a filter on the Type = Select
Screenshot: https://www.evernote.com/shard/s16/sh/5c843e47-bff1-4d4b-b847-be98f3a2ec09/cf060a6cd9805f687fa0b5b46f3f0020
To find materialized views, you will need to query the catalog in your database (for example select object_name, object_type from user_objects where type_objet = "MATERIALIZED VIEW" ;) and compare it to the list of tables in your SPR)
-> How opaque views will degrade the performance and how a materialized view will improve performance at the level of the report.
A materialized view is materialized, in other words, the results are already stored in the database. This means usually there will be more efficient because all the joins and aggregations, etc. will be settled in advance.
-
The Materialized View - ORA-12052: is unable to fast refresh materialized view
Hello
I was hitting my head all day trying to create materialized views. I have made some progress, but have hit a brick wall, unfortunately!
Basically, I have been invited to take a view and see if I can get the benefits of performance by transforming all or part of it in materialized views. Because the underlying tables of the config is updated quite frequently, I want to fast refresh materialized views on commit. However, when I try to create a materialized view containing an outer join in an aggregated materialized view table, I get ORA-12052: is unable to fast refresh materialized view.
I went through the documentation and also Rob van Wijkvery useful series of blogs on the topic (especially http://rwijk.blogspot.co.uk/2009/09/fast-refreshable-materialized-view.html) but have not found anything that matches. Maybe I missed something somewhere along the line, or maybe I'm asking just something completely impossible?
My db is 11.2.0.2.
Here's the test scripts, I've worked with that:
drop materialized view test1_test2_mv;
Drop materialized view test2 journal;
drop table test2;
Drop materialized view test1_mv newspaper;
drop materialized view test1_mv;
Drop materialized view test1 journal;
drop table test1;create table test1 (identification number,
type varchar2 (10),
number of Val,
update_time date,
constraint t1_pk primary key (id, type, val));
Insert into test1
Select 1, 'a', 1001, sysdate - 10/24 Union double all the
Select 1, 'b', 1003, sysdate - 9/24 Union double all the
Select 1, 'c', 1002, sysdate - 8/24 Union double all the
Select 1, had ', 1004, sysdate - 7/24 Union double all the
Select 1, 'e', 1005, sysdate - 6/24 Union double all the
Select 1, 'c', 1006, sysdate - 5/24 Union double all the
Select 2, 'a', 1002, sysdate - 4/24 Union double all the
Select 2, 'b', 1005, sysdate - 3/24 Union double all the
Select 3, 'a', 1001, sysdate - 2/24 Union double all the
Select 3, 'c', 1006, sysdate - 1/24 Union double all the
Select 3, 'e', 1008, sysdate - 2/24 Union double all the
Select option 4, has ', 1004, sysdate - 3/24 Union double all the
Select 5, 'b', 1002, sysdate - 4/24 Union double all the
Select 5, 'g', 1001, sysdate - 5/24 Union double all the
Select 6, 'h', 1004, sysdate - 6/24 Union double all the
Select 7, 'b', 1007, sysdate - 7/24 Union double all the
Select 7, had ', 1001, sysdate - 8/24 double;commit;
Select * from test1;
CREATE MATERIALIZED VIEW LOG ON test1
WITH rowid, primary key (update_time)
including the new values;
Test1_mv CREATE MATERIALIZED VIEW
IMMEDIATE CONSTRUCTION
COOL OFF QUICKLY ON COMMIT
Did YOU SELECT id,
MAX (case when type = "there" end of val) THAT col_a,.
MAX (case when type = 'b', then val end) AS col_b,.
MAX (case when type = 'c' then end val) AS col_c,.
MAX (case when type = ' then end of val) AS col_d,
MAX (update_time) AS update_time
OF test1
WHERE TYPE in ('a',
« b »,
« c »,
a ')
GROUP BY id;CREATE MATERIALIZED VIEW LOG ON test1_mv
WITH rowid
including the new values;
create table test2 (identification number,
col2 number,
COL3 varchar2 (10),
number of COL4,
constraint t2_pk primary key (id));
Insert into test2
Select 1, 1, 'bob', 1 double Union all
Select 2, 1, "sue", 1 double Union all
Select 3, 1, 'tom', 1 double Union all
Select 4, 1, 'jay', 1 double Union all
Select 5, 1, 'art', 1 double Union all
Select 6, 1, 'kay', 1 double Union all
Select 7, 1, 'max', 1 double Union all
Select 8, 1, 'tim', 1 double Union all
Select 9, 1, "liz", 1 from dual;commit;
CREATE MATERIALIZED VIEW LOG ON test2
WITH rowid, primary key
including the new values;
Test1_test2_mv CREATE MATERIALIZED VIEW
IMMEDIATE CONSTRUCTION
COOL OFF QUICKLY ON COMMIT
LIKE SOME t2.rowid,.
T1.ID,
T1.col_a,
T1.col_b,
T1.col_c,
T1.col_d,
T1.update_time,
T2.col2,
T2. COL3
OF test1_mv t1,.
Test2 t2
WHERE (+) t1.id = t2.id; -symbol of outer join is not correctly displayed on the forums without space, grr!ORA-12052: is unable to fast refresh materialized view TEST1_TEST2_MV
Y at - it any way I can get the materialized view fast refresh on commit or I asking the impossible?
Add t1.rowid:
SQL > CREATE MATERIALIZED VIEW test1_test2_mv
2 BUILD IMMEDIATE
3 QUICK REFRESH YOU COMMIT
4 AS t2.rowid SELECT rid2,
5 t1.rowid rid1,
6 t1.id
T1.col_a 7,.
T1.col_b 8,.
T1.col_c 9,.
T1.col_d 10,
T1.update_time 11,
T2.col2 12,
13 t2.col3
14 OF test1_mv t1,
15 test2 T2
16 WHERE t1.id = t2.id
17.
Materialized view created.
SQL > select * from test1_test2_mv
2.
RID2 RID1 ID COL_A, COL_B, COL_C COL_D UPDATE_TIME COL2 COL3
------------------ ------------------ ---------- ---------- ---------- ---------- ---------- ------------------- ---------- ----------
AAAYB6AANAAAANDAAA AAAYB/AANAAAAN/AAA 1 1001 1003 1006 1004 25 / 06 / 2014 12:54:16 1 bob
AAAYB6AANAAAANDAAB AAAYB/AANAAAAN/AAB 2 1002 1005 25 / 06 / 2014 1 sue 14:54:16
AAAYB6AANAAAANDAAC AAAYB/AANAAAAN/AAC 3 1001 1006 25 / 06 / 2014 16:54:16 1 tom
AAAYB/AANAAAAN/AAD AAAYB6AANAAAANDAAD 4 1004 25/06/2014 14:54:16 1 jay
AAAYB6AANAAAANDAAE AAAYB / AANAAAAN / AAE 5 1002 2014/06/25 13:54:16 1 art
AAAYB6AANAAAANDAAF AAAYB/AANAAAAN/AAG 7 1007 1009 25 / 06 / 2014 10:54:16 max 1
AAAYB/AANAAAAN/AAH 1 tim
AAAYB/AANAAAAN/AAF 1 kay
AAAYB/AANAAAAN/AAI 1 liz
9 selected lines.
SQL > update of test2
2 set col3 = "fly."
3 where id = 7
6 m
1 line update.
SQL > validation
2.
Validation complete.
SQL > select * from test1_test2_mv
2.
RID2 RID1 ID COL_A, COL_B, COL_C COL_D UPDATE_TIME COL2 COL3
------------------ ------------------ ---------- ---------- ---------- ---------- ---------- ------------------- ---------- ----------
AAAYB6AANAAAANDAAA AAAYB/AANAAAAN/AAA 1 1001 1003 1006 1004 25 / 06 / 2014 12:54:16 1 bob
AAAYB6AANAAAANDAAB AAAYB/AANAAAAN/AAB 2 1002 1005 25 / 06 / 2014 1 sue 14:54:16
AAAYB6AANAAAANDAAC AAAYB/AANAAAAN/AAC 3 1001 1006 25 / 06 / 2014 16:54:16 1 tom
AAAYB/AANAAAAN/AAD AAAYB6AANAAAANDAAD 4 1004 25/06/2014 14:54:16 1 jay
AAAYB6AANAAAANDAAE AAAYB / AANAAAAN / AAE 5 1002 2014/06/25 13:54:16 1 art
AAAYB/AANAAAAN/AAH 1 tim
AAAYB/AANAAAAN/AAF 1 kay
AAAYB/AANAAAAN/AAI 1 liz
AAAYB6AANAAAANDAAF AAAYB/AANAAAAN/AAG 7 1007 1009 25 / 06 / 2014 10:54:16 1 rob
9 selected lines.
-
Problems with the materialized view
Hello
I need help enforce data integrity using a materialized view. In my example, each system can consist of three types of components, and it is modeled using the supertype/subtype relationships. I'm trying to argue that, for a given system, a component cannot reside in more than one table of components. For example, given the system 1, if A component exists in the mobile_components table, it is impossible to insert into the table desktop_components for system 1. Rather than using triggers, I try to use views materialized with unique constraint to enforce this rule based on the example of "The trouble with triggers" article http://www.oracle.com/technetwork/issue-archive/2008/08-sep/o58asktom-101055.html of Tom Kyte. However, I can't seem to make it work because it gives me ORA-12054: cannot set the ON COMMIT refresh attribute. I use UNION ALL and I know that can be difficult, but I can not understand what are the rules I'm breaking. I have the necessary privileges. Oracle 11g. Can anyone help?
Thank you
Mark
create table systems ( sys_id number, sys_name varchar2(100), constraint sys_pk primary key (sys_id), constraint sys_uk unique (sys_name)); insert into systems values (1,'System 1'); insert into systems values (2,'System 2');
create table mobile_components ( mo_comp_id number, mo_comp_name varchar2(100), mo_comp_sys_id number, constraint mo_pk primary key (mo_comp_id), constraint mo_uk unique (mo_comp_name, mo_comp_sys_id), constraint mo_fk foreign key (mo_comp_sys_id) references systems (sys_id)); insert into mobile_components values (1,'Component A',1); insert into mobile_components values (2,'Component A',2);
create table desktop_components ( de_comp_id number, de_comp_name varchar2(100), de_comp_sys_id number, constraint de_pk primary key (de_comp_id), constraint de_uk unique (de_comp_name, de_comp_sys_id), constraint de_fk foreign key (de_comp_sys_id) references systems (sys_id)); insert into desktop_components values (1,'Component B',1); insert into desktop_components values (2,'Component B',2);
create table internet_components ( in_comp_id number, in_comp_name varchar2(100), in_comp_sys_id number, constraint in_pk primary key (in_comp_id), constraint in_uk unique (in_comp_name, in_comp_sys_id), constraint in_fk foreign key (in_comp_sys_id_ references systems (sys_id)); insert into internet_components values (1,'Component C',1); insert into internet_components values (2,'Component C',2);
create materialized view log on mobile_components with rowid; create materialized view log on desktop_components with rowid; create materialized view log on internet_components with rowid;
create materialized view mv_components refresh fast on commit with rowid as select rowid as row_id, mo_comp_id as comp_id, mo_comp_name as comp_name from mobile_components union all select rowid, de_comp_id, de_comp_name from desktop_components union all select rowid, in_comp_id, in_comp_name from internet_components; alter table mv_components add constraint mv_comp_uk unique (comp_id, comp_name);
You need a column marker to distinguish which questions you Union, that the data are:
for example
Create materialized view mv_components
cool off quickly on commit with rowid as
Select 'a' marker, rowid as row_id, mo_comp_id as identifiant_composant mo_comp_name as comp_name
of mobile_components
Union of all the
Select 'b', rowid, de_comp_id, de_comp_name
of desktop_components
Union of all the
Select 'c', rowid, in_comp_id, in_comp_name
of internet_components;
-
Change the definition of the materialized view while maintaining access for users uninteruupted
Hello
We have a system report and the need to change the report definition mv access - like to do it without interruption.
Is this possible?
the sql behind mv was change picks up so column of another table.
Have you heard but not used for dbms_redefinition tables
Thank you
It is built in the Oracle solution for this one, where you can edit the definition WITHOUT interruption. You can drop the materialized view existing with the clause "save table" and rebuilt the view materialized on 'predefined table'. I googled this example for you
create materialized view mv1 as select dept , count(*) as cnt from scott.emp;
We want to change the statement so that only dept more 5 will be calculated
drop materialized view mv1 preserve table;
Notice that
PRESERVE TABLE
clause - mv1 table is not droped - single layer mview.desc mv1
now, we create the mview with a different query on top of the existing table
create materialized view mv1 on prebuilt table as select dept , count(*) as cnt from scott.emp where dept > 5;
Notice that
on prebuilt table
the mview uses the existing object clause.exec dbms_mview.refresh_mview('mv1');
http://StackOverflow.com/questions/18085894/redefine-MATERIALIZED-view-with-no-downtime
http://Arup.blogspot.com/2009/01/ultra-fast-MV-alteration-using-prebuilt.html
-
Elapsed time for the materialized view vs Master table query
Hello all;
Small confusion about time up for the vs Master materialized view table query
SQL > select count (*), sum (quan_sold), sum (amt_sold) of the sale;
COUNT (*) SUM (QUAN_SOLD) SUM (AMT_SOLD)
6000000 12000000 720480000
Elapsed time: 00:00:30.54
SQL > create materialized view mv1
Materialized view created.
2 activate the rewrite of the query as
3. select count (*), sum (quan_sold), sum (amt_sold) of the sale;
Elapsed time: 00:00:01.45
SQL > select count (*), sum (quan_sold), sum (amt_sold) of the sale;
COUNT (*) SUM (QUAN_SOLD) SUM (AMT_SOLD)
6000000 12000000 720480000
Elapsed time: 00:00:00.01
Please see the three cases "Elapsed Time"...
When comparing other cases.
1. my query takes long time (30.54), extraction of data from the sale
2. create a materialized view takes less time (01:45) why?
Source: http://uhesse.com/2009/07/08/brief-introduction-into-materialized-views/>
Small confusion about elapsed time for the materialized view vs Master table querySQL > select count (*), sum (quan_sold), sum (amt_sold) from the sale.
COUNT (*) SUM (QUAN_SOLD) SUM (AMT_SOLD)
6000000 12000000 720480000
Elapsed time: 00:00:30.54SQL > create materialized view mv1
2 activate the rewrite of the query as
3. select count (*), sum (quan_sold), sum (amt_sold) of the sale;
Materialized view created.
Elapsed time: 00:00:01.45SQL > select count (*), sum (quan_sold), sum (amt_sold) from the sale.
COUNT (*) SUM (QUAN_SOLD) SUM (AMT_SOLD)
6000000 12000000 720480000
Elapsed time: 00:00:00.01Please see the three cases "Elapsed Time"...
When comparing other cases.
1. my query takes long time (30.54), extraction of data from the sale
2. create a materialized view takes less time (01:45) why?
>
Many queries take less time the second time you run them. After the first performance, there may be many, if not all, lines in the buffer cache. Then the second round will not make any or all e/s physical but will obtain data from the buffer cache.Also, you haven't checked that the MV was even used for the second run.
Drop the MV and make the query several times and means of the time. Then create the MV and do the same thing.
-
ORA-12083: must use DROP MATERIALIZED VIEW to drop
Hi all
Oracle 10 g 2
Solaris 10
face below question... can't go below the user because of the MV... Please let me know how to delete user and MV...
SQL > drop user cascade DW_USR;
*
ERROR on line 1:
ORA-00604: an error has occurred at the SQL level 1 recursive
ORA-12083: must use DROP MATERIALIZED VIEW to drop
'DW_USR '. "" Dept_account_MV_M ".I tried as you said... .but no luck.
.. is this a bug?I hope that's not a bug...
I hope.. materialized view appears to be abandoned by the drop command but recreation fails because of some disctionary sys tables. the origin of the problem... it's suspicious only...
check once... otherwise connect you SR with metalink...
-
Refresh the Materialized View constructed from an external table commit?
Is it possible to create a materialized with Refresh view on commit built from an external table?
I think the answer is "no, because there is no way for the outer table report to the view materialized it has been changed," but I would like to be sure before I tell my client who has requested the opportunity to do this (or, Alternatively, to learn how Oracle hoops I have to cross in order to operate).
I can create a Refresh on demand, it is not a question of not having the necessary permissions to create the materialized view itself.No, you can't. The outer table is not modified in a transactional way and there no materialized view logs, so there is no event to hang in and no delta to apply.
However, you can use dbms_scheduler observer file that will ask for the presence of a file and load the data in a table or refresh a materialized view based on the external table.
Justin
-
diff between the view and the materialized view
Hi all
Whats different between the view and the materialized view?
could someone help me pls this topic
thnks in advanceSee nothing else that a set is a set of sql statements that join the single or multiple tables and shows the data... However views do not have the data themselves but point to the data.
Whereas the materialized view is a concept used primarily in the Datawarehousing... these views contain the data itself. Reason being, it is more easy/quick access to the data. The main objective of Materialized view is to perform calculations and display data from multiple tables by using joins.
check out the link for more information below.
http://www.geekinterview.com/question_details/29332rajeysh
http://oracleinstance.blogspot.com -
Refresh of the materialized view; Process flow
I was wondering if anyone has used process flow to refresh the materialized view.
I'm trying to use a process flow for it, either run something similar to below
EXECUTE Dbms_refresh.Refresh ('"ODW_SRC".) "MV_SERVICE_DAILY_AUDIT" ');
I try to avoid using the Scheduler of DB because I want to make sure that the process flow is not conflict with the update of a materialized view possible cause conflict more execution time of the work expected will refresh window.
I guess I could use a transformation and build. but I was wondering if there is an easier way in the execution of it just line... an idea
Thanks in advance for your helpSorry, I think that the term OWB is post mapping process, its actually an operator in an OWB mapping where you can add a procedure for example call. The procedure can do pretty much what he wants.
See you soon
David -
Difference between the view and the materialized view
Hi all
Can someone tell me exactly the difference between the view and materialized views?Hello
View:-this is a virtual table means table is there, but in fact is not there...
see how to create a view...create or replace view aaa as select * from emp;
Now, when we choose the AAA, he will show me all the data that would be returned by running a query "Select * from emp"... Thus, all data will come from table iteself.
View in itself is nothing but just a Sql statement that is used to create the view, in this case definition is "select * from emp.
Any update in the database table Emp which is in our case, would automatically result in the view...
Any changes (all dml) will actually update the base table (conditions apply *)Now the materialized view:-this is the same as except that it is not a virtual table... This will be created separately and it will acutally hold the result of the query that is used to create it. Any subsequent changes in the base table only will be included in the opinion of M M view is refreshed...
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The materialized view log and user...
Hello
Suppose a user, we will call him A has a table and another user B must create a log of materialized view on the table that a user has.
While user B have all the privileges of object (direct priv insert, update, delete... not through a role) on the table to the user may not create a log of mv on this table on its schema...
Thus, the insert/update/delete stmts on < table_name > are run successfully (after having logged on as user B).
The error message ' ORA-00942: table or view does not exist ' appears when I run the command:
Connect B/B;
create log view materialized on table_name with sequence including new values;
Note: I use ORADB 10.2.0.4 and it stands for table-name to user B (which tries to create the log of mv on)...
The req. above is possible somehow?
Thank you
SIMThe documentation says the following:
The materialized view log is created in the same schema as the master of the target.
HTH!
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