The master table of a materialized view

Hi Everybody,
I have in my database a snapshot created on multiple tables, like this:
create materialized view <some_name>
as select <some_fields>
from a,b, c
where <some_join_conditions>
Questions:
1. What "algorithm" uses Oracle to determine the master table of the snapshot? The master table visible in USER_SNAPSHOTS?
2. How can I change the master table chosed by Oracle with the table I want? I tried using some tuning hints (for example "leading table") but it is not working.
The table I want to force as master table is a remote one accessed by dblink. Does this change anything?
Thank you very much.
Daniela

We had issue with similar probelm and found that driving table is becoming master table, which was last table on your from clause (c).
However the Query Optimizer is COST based, and we are not sure this holds true forever.
We are looking at these answers too.

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Will Materialized view log reduces the performance of DML statements on the master table

Hi all,
I need to refresh a on demand fast refresh Materialized view in Oracle 11GR2. For this purpose I created a Materialized view log on the table (Non partitioned) in which records will be inserted @ rate of 5000/day as follows.
CREATE MATERIALIZED VIEW LOG ON NOTES NOLOGGING WITH PRIMARY KEY INCLUDING NEW VALUES;
This table already has 20L records and adding this Mview log will reduce the DML performance on the table ?
Please guide me on this.

Having the base table maintain a materialised view log will have an impact on the speed of DML statements - they are doing extra work, which will take extra time. A more sensible question would be to ask whether it will have a significant impact, to which the answer is almost certainly "no".
5000 records inserted a day is nothing. Adding a view log to the heap really shouldn't cause any trouble at all - but ultimately only your own testing can establish that.

Altering a table in a materialized view environment

Hello everybody!.
My question is as simple as this:
When I have a single master - multiple materialized views environment , and I want to alter the master table (usually adding a column) , how do I propagate the change to the materialized view sites ?
In Oracle's documentation manuals it is written the process ONLY for the master sites.If I manually just alter the materialized views to the mat.views sites , the new columns DON'T take data from the master table!
It would be very nice if someone could help me.
Thanks everybody on advance!.
Thanasis Avdis

Hi,
you must dorp and recreate materialized view.

ORA-00600: internal error when delete master rows in a materialized view

I have a materialized view in 11g2 on Redhat 5, defined asCREATE MATERIALIZED VIEW mv_idty
PARALLEL BUILD IMMEDIATE REFRESH FAST ON COMMIT ENABLE QUERY REWRITE AS
select IDTY_NAME_FIRST,IDTY_NAME_MIDDLE,IDTY_NAME_LAST,IDTY_NAME_SUFFIX,IDTY_SSN,
IDTY_DR_LIC_NUM,IDTY_DR_LIC_STA,x.person_id,i.rowid i_rowid,x.rowid x_rowid
from idty i,person_x_idty x where x.idty_id=i.idty_id; I deleted a few rows from the master tables and get error13:58:48 SQL> delete idty where idty_id like 'test_row%' ;
7 rows deleted.
13:58:52 SQL> commit;
commit
ERROR at line 1:
ORA-12008: error in materialized view refresh path
ORA-00600: internal error code, arguments: [kkzfrfajv_markdml-1], [], [], [], [], [], [], [], [], [], [], [] I have other materialized views and they all delete master OK. This is the simplest one but causes problem. HELP!
Edited by: user13148231 on Aug 11, 2010 5:45 PM

Checked note 743766.1. It is not 100% relevant as it is about import, but the query is usefulselect sowner, vname, mowner, master from sys.snap_reftime$It reveals the materialized view some how based on other schema.
Recreate the materialized view. problem solved.

Selection in the master table is not getting reflected in the child table

 I have a 4 level master detail relationship.I have a bounded taskflow where I have a master in the first view.The child (The other two levels as a tree) in the second view.I move to second view when i click the command link(Each row has a command link) of the master table (present in the first view).
At the very first time when i try to insert a row in the child it's successful .I am able to see the same in the second view (The corresponding child of the master row which i have clicked).The 2 view is not refreshed i have panel strech layout in the 2 view which i am refreshing(PPR) on inserting the row. The master table is not refreshed as it is in the 1 view.I am not manipulating the master table but it was being set to the first row the second time .Added to that the 2 view doesn't have parent table .

Thanks,
Raj.

Hi Frank,
I am using jdev 11.1.1.6 and integrated wls.
I have a single taskflow.I have a 4 level master detail.The vo's are connected through a view link . I have dropped the first level as a table . On selecting a row the corresponding children are displayed.The children are displayed as a tree. I have a tree context menu where i have inserted a row using popup . When the user clicks on the ok dialog i am commiting the data and refreshing the tree.
Now the problem is when i first create the row it's working properly . After when i try to create another row this time the currency of the first level is reset to the first row.
As suggested by you i have tried disabling the commit opertion . But the issue still occurs.
Thanks,
Raj
Edited by: RajaSekharReddy.M on Feb 26, 2013 6:03 PM

Table Operator Vs Materialized View Operator

Hi All,
Could you please give the differences between Table Operator and Materialized view Operator in Oracle Warehouse Builder 11g.
Regards,
Subbu

Below an extract of my notes of the Materialized view. The complete notes are here :
http://gerardnico.com/wiki/dw/aggregate_table
=====Notes=====
Materialized views are the equivalent of a summary table. (Materialized views can be also use as replica).
In a olap approach, each of the elements of a dimension could be summarized using a hierarchy.
The end user queries the tables and views in the database. The query rewrite mechanism in a database automatically rewrites the SQL query to use this summary tables.
This mechanism reduces response time for returning results from the query. Materialized views within the data warehouse are transparent to the end user or to the database application.
This is relatively straightforward and is answered in a single word - performance. By calculating the answers to the really hard questions up front (and once only), we will greatly reduce the load on the machine, We will experience:
* Less physical reads - There is less data to scan through.
* Less writes - We will not be sorting/aggregating as frequently.
* Decreased CPU consumption - We will not be calculating aggregates and functions on the data, as we will have already done that.
* Markedly faster response times - Our queries will return incredibly quickly when a summary is used, as opposed to the details. This will be a function of the amount of work we can avoid by using the materialized view, but many orders of magnitude is not out of the question.
Materialized views will increase your need for one resource - more permanently allocated disk. We need extra storage space to accommodate the materialized views, of course, but for the price of a little extra disk space, we can reap a lot of benefit.
Also notice that we may have created a materialized view, but when we ANALYZE, we are analyzing a table. A materialized view creates a real table, and this table may be indexed, analyzed, and so on.
Success
Nico

How and where does SAP standard programs update the master tables...

Hello there,
How and where does SAP standard programs update the master tables...
to be precise.. if a (any) transaction occurs the programs behind it holds the data in temporary structures.
where and when does it get updated in the master table.
can anyone tell me how it happens?
I Know that from the where used list one can find the corresponding table but most of the time it wont suffice
I am expecting a proper answer.
Santosh B

Hello Santosh,
you need to do some self-reading on the following topic
Updates in the SAP System (BC-CST-UP)
http://help.sap.com/saphelp_47x200/helpdata/en/e5/de86e135cd11d3acb00000e83539c3/frameset.htm
Regards,
Siddhesh

IWork Numbers program. I am trying to create a 'Master Table'. The table will be used on numerous sheets, when cells altered on the 'Master' it will show on all sheets using the Master table. Is this a possibility??

iWORK NUMBERS
I am trying to create a 'Master Table'. This table will be used on numberous sheets, however not all. Items entered into the cells in the Master Table will then reflect in the used sheets that have the Master Table linked.
On the individual pages however, they will be able to be altered purely for that page.
Hope I have explained myself clearly,
Would appreciate any help,
Cheers,

Hi Hilary,
The formula in the Index column of the Main table is:
E2: =IF(A,MAX($E$1:E1)+1,"")
Fill down to the end of column E.
The Breakout table contains a single formula:
A2: =IF((ROW()-1)>MAX(Main :: $E),"",OFFSET(Main :: $A$1,MATCH(ROW()-1,Main :: $E,0)-1,COLUMN()))
Fill down and right to fill the table.
For multiple rooms (with different data transfered to each) you'll need a column of checkboxes and a corresponding index column for each room.
The index columns can be hidden.
Contents in individual cells in the breakout tabel(s) can be entered directly, replacing the formula. To retun to the calculated result, select a cell adjacent to the one where text was entered, and drag the Fill control handle (small circle, bottom right of the selection rectangle) to fill the formula back into that cell.
Regards,
Barry

What are the master tables of transaction MB56

Hi Team ,
Please help me to get the master tables of transaction MB56
Thanks & Regards,
Samantula

Hello,
Some of the Master tables are,
MARA,
MARC,
T001W,
MCHA,
MCH1.
Hope this helps,
Regards,

What to know the master table for the following fields

I want to know the master table for the following fields.
Company code ( BUKRS )
Chart of depreciation ( AFAPL)
Main Asset Number (ANLN1)
Asset Sub Number ( ANLN2 )
Asset Class ( ANLKL )

hi,
1) t001 (for assets T093C)
2) t096
3 and 4) anla
5) anka
rgds Andreas
Message was edited by:
Andreas Mann

How to refresh a child table each time I select a row in the master table

I've 2 tables, a master table and a child table.
When i click on each row of the master table, the child table needs to be refreshed.
I've given the id of table1(master) as the CreatePartialTrigger value in table2(child).
The refresh does happen but it happens in an inconsistent manner.
For eg. in my scenario,
1.I add a row to the master table
2.Click on the create button of the child table, this opens a popup and i enter a few values and the child row gets added.
3.Now when i toggle between the rows in my master table, the refresh does not happen and I see duplicate rows in the child table but in the datebase only one record gets stamped..
Is there any clean way to refresh the child table based on the row selection in the master table.
Kindly let me know.
Table1
<fnd:applicationsTable tableId="table">
<af:table value="#{bindings.Actions1.collectionModel}" var="row"
rows="#{bindings.Actions1.rangeSize}"
fetchSize="#{bindings.Actions1.rangeSize}"
selectedRowKeys="#{bindings.Actions1.collectionModel.selectedRow}"
selectionListener="#{bindings.Actions1.collectionModel.makeCurrent}"
rowSelection="single" id="table1"
contentDelivery="immediate" editingMode="clickToEdit"
columnSelection="multiple" autoHeightRows="10"
summary="#{HcmActionsTopGenBundle['Header.Action.ActionCode']}" rowBandingInterval="0"
styleClass="AFStretchWidth"
partialTriggers="::create ::createMenuItem">
<af:column id="column1" headerText=" " width="5"
rowHeader="true"/>
<af:column sortProperty="ActionCode" sortable="true"
headerText="#{bindings.Actions1.hints.ActionCode.label}" width="150"
showRequired="true" rendered="true" id="c1">
<af:inputText value="#{row.bindings.ActionCode.inputValue}"
label="#{bindings.Actions1.hints.ActionCode.label}"
required="#{bindings.Actions1.hints.ActionCode.mandatory}"
columns="#{bindings.Actions1.hints.ActionCode.displayWidth}"
maximumLength="#{bindings.Actions1.hints.ActionCode.precision}"
shortDesc="#{bindings.Actions1.hints.ActionCode.tooltip}" id="it1"
autoSubmit="true"
/>
</af:column>
</fnd:applicationsTable>
Table 2
<fnd:applicationsTable tableId="table2"
styleClass="AFStretchWidth"
id="AT2"
actionsMenuRendered="false"
secondaryToolbarRendered="false"
createPatternType="secondaryWindow"
createText="#{hcmActionsBundle['Action.Add']}"
createAction="#{backingBeanScope.SetupUiBean.invokeCreatePopUp}"
createPopupId="create1"
editEnabled="false"
createPartialTriggers="table1"

Hi Frank,
As you mentioned I already have the id of my master table which is 'table1' as the createPartialTrigger in my child table.
In my case there are 2 scenarios.
I add a row to the Master table and when I click on the create button on the chile table, I get a pop with 'Yes' , 'No' and 'Cancel'
Scenario1
If I click 'Yes' , then I get another popup where I enter the values for the ActionReasonsActionReasonUsagesVO which is a combination of the ActionReasonsEO and the ActionReasonUsagesEO, now when I click on OK, a new row gets created in the ActionReasonsActionReasonUsagesVO.
In the above scenario things work fine, as I toggle between the rows in the Master table the child table gets refreshed.
Scenario2
If I click 'No' I get a search popup where I can query up the ActionReasonsVO and select existing data,on clicking OK, the values get mapped from the ActionReasonsVO to the ActionReasonsActionReasonUsagesVO.
Now when I toggle between the rows in my master table, I observe 2 types of behaviors
1.Due to incorrect refresh, the child table rows vanishes from the UI.
2.There are duplicate rows in the child table.
The issue is specific to this scenario where the refresh of the child table rows does not happen correctly.
Edited by: 944295 on Apr 18, 2013 5:16 PM

Is it possible to refresh the table from a Materialized view

Hi,
Is it possible to update the underlying table on which a Materialized view is created when some changes in a Materialized view is done.Is this reverse compatibility possible in Materialized View?
Thanks in Advance,
V.Dennis

If you created the materialized view as UPDATEABLE then changes to it should automatically be relected in the underlying table. If this is not occurring I suggest you check the replication jobs. You probably have a stack of errors in DEFERROR.
Cheers, APC

Attribute of the Master Table in the Selection screen

Hi Experts,
I'm maintaining a Material Master table with all these attributes
MATERIAL CODE -
Material Description
Material Group
Material Price
Material Type
In my transaction table only the material code is loaded along with the other transactions and the material group, price or description is viewed in report as I'm maintaining the master.
If I want to view only the Group G1in the report. Can I bring this group in the selection screen to view only those details of the transation belong to the respective group?
Since I'm maintaining the group in master table. Will the selection variable consider the attribute of the Transaction Field (Material)?
I'm not very sure whether it is possible.
Can anyone please adive me.
Thanks

HI,
IF you want to view the report based Material Group with out the MATERIAL CODE
then you want to make the Material group as navigational attribute.
Regards,
Sankar Reddy

Problem encountered when join two remote tables in a materialized view

I'm using oracle 9.2.0.6
1> I have two tables:
CREATE TABLE TEST
A VARCHAR2(100 BYTE),
C DATE
CREATE TABLE TEST1
A VARCHAR2(100 BYTE),
B TIMESTAMP
2>. I defined a prebuild table:
CREATE TABLE MV_TEST1
ID1 ROWID,
A VARCHAR2(100 BYTE),
ID2 ROWID,
B TIMESTAMP(6),
C DATE
3> I created mview logs:
CREATE MATERIALIZED VIEW LOG ON PSI_TEST.TEST
WITH ROWID
INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON PSI_TEST.TEST1
WITH ROWID
INCLUDING NEW VALUES;
4> when I create mview:
CREATE MATERIALIZED VIEW PSI_TEST.MV_TEST1
ON PREBUILT TABLE WITH REDUCED PRECISION
REFRESH FAST ON DEMAND
WITH PRIMARY KEY
AS
select
test.rowid id1,
test.a,
test1.rowid id2,
test1.b,
cast(null as date) c
from test , test1
where test.a = test1.a(+);
It is created successfully.
5> problem:
when I use remote tables to do the same thing, say test and test1 are in another instance and are connected by a dbLink, I couldn't create the mview successfully:
CREATE MATERIALIZED VIEW PSI_TEST.MV_TEST1
ON PREBUILT TABLE WITH REDUCED PRECISION
REFRESH FAST ON DEMAND
WITH PRIMARY KEY
AS
select
a.rowid id1,
a.a,
b.rowid id2,
b.b,
cast(null as date) c
from test@dbl a, test1@dbl b
where a.a = b.a(+);
when run above statement, I got:
ORA-12015: cannot create a fast refresh materialized view from a complex query
Any ideas? Or joining two table through a dblink for a mview is not allowed at all?
Thanks in advance.

No one has a clue?
Message was edited by:
lzhwxy

Error insert data over db link in table covered by materialized view

Hello together,
following problem:
I got a table called LOCATION_INFO which is defined:
create table LOCATION_INFO
LOCATION_ID VARCHAR2(40) not null,
PLANT VARCHAR2(4) not null,
PRODUCT VARCHAR2(3),
AREA VARCHAR2(1),
LINE NUMBER(10),
STATION NUMBER(10),
STATINDEX NUMBER(10),
FU NUMBER(10),
WP NUMBER(10),
TP NUMBER(10),
LOCATION_LEVEL NUMBER(1) not null,
LOCATION_PARENT_ID VARCHAR2(40),
TIME_STAMP TIMESTAMP(6) WITH TIME ZONE not null
I try to load data over PL/SQL procedure from another database using database link:
INSERT INTO LOCATION_INFO
(LOCATION_ID,
PLANT,
PRODUCT,
AREA,
LINE,
STATION,
STATINDEX,
FU,
WP,
TP,
LOCATION_LEVEL,
LOCATION_PARENT_ID,
TIME_STAMP)
SELECT LOCATION_ID,
PLANT,
PRODUCT,
AREA,
LINE,
STATION,
STATINDEX,
FU,
WP,
TP,
LOCATION_LEVEL,
LOCATION_PARENT_ID,
GetUTCDateTime(TIME_STAMP) AS time_Stamp
FROM LOCATION_INFO@SOURCE_MMPDDB
WHERE ROWNUM < 100;
This works fine (If i do select count(*) from location_info the data is present) but if set a commit
ORA-00603 appears and the session is terminated.
The point is i got a materialized view MVIEW_LOCATIONS in another schema in the database reading the data from my table location_info and a corresponding MVIEWLOG.
create table MLOG$_LOCATION_INFO
LOCATION_ID VARCHAR2(40),
SNAPTIME$$ DATE,
DMLTYPE$$ VARCHAR2(1),
OLD_NEW$$ VARCHAR2(1),
CHANGE_VECTOR$$ RAW(255)
CREATE MATERIALIZED VIEW MVIEW_LOCATIONS
REFRESH FAST ON COMMIT
ENABLE QUERY REWRITE
AS
SELECT "LOCATION_INFO"."LOCATION_ID" "LOCATION_ID","LOCATION_INFO"."PLANT" "PLANT","LOCATION_INFO"."PRODUCT" "PRODUCT","LOCATION_INFO"."AREA" "AREA","LOCATION_INFO"."LINE" "LINE","LOCATION_INFO"."STATION" "STATION","LOCATION_INFO"."STATINDEX" "STATINDEX","LOCATION_INFO"."FU" "FU","LOCATION_INFO"."WP" "WP","LOCATION_INFO"."TP" "TP","LOCATION_INFO"."LOCATION_LEVEL" "LOCATION_LEVEL","LOCATION_INFO"."LOCATION_PARENT_ID" "LOCATION_PARENT_ID","LOCATION_INFO"."TIME_STAMP" "TIME_STAMP" FROM "CP4MMPDNEW"."LOCATION_INFO" "LOCATION_INFO";
What do I need to do to make the insert working properly without deleting my mviews?
Can anyone help me?
Thanks, Matthias

Helllo,
Can you change this on your Materialized View DDL:
REFRESH FAST ON COMMITTo:
REFRESH FAST ON DEMANDThen, if your INSERT and COMMIT works OK then, can you try:
exec DBMS_MVIEW.REFRESH('MVIEW_LOCATIONS')

The master table of a materialized view

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