MERGE Statement - unable to get a stable set of rows in the source tables

OWB Client: 10.1.0.2.0
OWB Repository: 10.1.0.1.0
I am trying to create a MERGE in OWB.
I get the following error:
ORA-12801: error signaled in parallel query server P004 ORA-30926: unable to get a stable set of rows in the source tables
I have read the other posts regarding this and can't seem to get a fix.
The target table has a unique index on the field that I am matching on.
The "incoming" data doesn't have a unique index, but I have checked and confirmed that it is unique on the appropriate key.
The "incoming" data is created by a join and filter in the mapping and I'd rather avoid having to load this data into a new table and add a unique index on this.
Any help would be great.
Thanks
Laura

Hello Laura,
The MERGE statement does not require any constraints on its target table or source table. The only requirement is that two input rows cannot update the same target row, meaning that all existing target rows can be matched by at most one input row (otherwise the MERGE would be undeterministic since you don't know which of the input rows you would end up with in the target).
If a table takes ages to load (and is not really big) I suspect that your mapping is not running in set mode and that it performs a full table scan on source data for each target row it produces.
If you ARE running in set mode you should run explain plan to get a hint on what is wrong.
Regarding your original mapping, try to set the target operator property:
Match by constraint=no constraints
and then check the Loading properties on each target column.
Regards, Hans Henrik

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MERGE error : unable to get a stable set of rows in the source tables

Hi,
For an update, the following MERGE statement throws the error-unable to get a stable set of rows in the source tables:
MERGE INTO table2t INT
USING (SELECT DISTINCT NULL bdl_inst_id,.......
FROM table1 ftp
WHERE ftp.gld_business_date = g_business_date
AND ftp.underlying_instrument_id IS NOT NULL) ui
ON ( ( INT.inst_id = ui.inst_id
AND g_business_date BETWEEN INT.valid_from_date
AND INT.valid_to_date
OR ( INT.ric = ui.ric
AND g_business_date BETWEEN INT.valid_from_date
AND INT.valid_to_date
OR ( INT.isin = ui.isin
AND g_business_date BETWEEN INT.valid_from_date
AND INT.valid_to_date
OR ( INT.sedol = ui.sedol
AND g_business_date BETWEEN INT.valid_from_date
AND INT.valid_to_date
OR ( INT.cusip = ui.cusip
AND g_business_date BETWEEN INT.valid_from_date
AND INT.valid_to_date
WHEN MATCHED THEN
UPDATE
SET INT.inst_id = ui.inst_id, INT.ric = ui.ric
WHEN NOT MATCHED THEN
INSERT (inst_key, ......)
VALUES (inst_key, ......);
To determine the existence of a record, first check if any match is found on the first key, if not then search for the second key and so on.
Now two records with differenct first key, i.e. inst_id, can have the same ric(second key). On a rerun, with the target table already populated, the code fails. The reason is it finds duplicate entries for the second key.
Any suggestions on how to make this work?
Thanks in advance.
Annie

Annie
You've spotted the problem (that two records have the same RIC). MERGE doesn't allow that; each record in the data being updated is only allowed to be updated once.
Is there a PK column (or columns) that we can rely on?
What you can try is to outer join FTP to INT. Something like:
MERGE INTO INT int1
USING (
    select columns_you_need
    from (
        select ftp.columns -- whatever they are
               , int2.columns
               , row_number() over (partition by int2.pk_columns order by int2.somecolumns) as rn
        from   ftp
        left join int int2
        on (the condition you used in your query)
    where rn=1
) s
WHEN MATCHED THEN UPDATE ...
WHEN NOT MATCHED THEN INSERT ...So if you can restrict the driving query so that only the first one of the possible updates actually gets presented to the MERGE operation, you might be in with a chance :-)
And of course this error is nothing to do with any triggers.
HTH
Regards Nigel

ORA-30926: unable to get a stable set of rows in the source tables

hi,
I am loading data from source table to target table in a interface.
Using LKM incremental update .
In the merge rows step , getting the below error.
30926 : 99999 : java.sql.SQLException: ORA-30926: unable to get a stable set of rows in the source tables
please help as what should be done to resolve this.

Below is the query in the merge step...
when i run from SQL also, same error
SQL Error: ORA-30926: unable to get a stable set of rows in the source tables
30926. 00000 - "unable to get a stable set of rows in the source tables"
*Cause:    A stable set of rows could not be got because of large dml
activity or a non-deterministic where clause.
*Action:   Remove any non-deterministic where clauses and reissue the dml.
merge into     TFR.INVENTORIES T
using     TFR.I$_INVENTORIES S
on     (
          T.ORGANIZATION_ID=S.ORGANIZATION_ID
     and          T.ITEM_ID=S.ITEM_ID
when matched
then update set
     T.ITEM_TYPE     = S.ITEM_TYPE,
     T.SEGMENT1     = S.SEGMENT1,
     T.DESCRIPTION     = S.DESCRIPTION,
     T.LIST_PRICE_PER_UNIT     = S.LIST_PRICE_PER_UNIT,
     T.CREATED_BY     = S.CREATED_BY,
     T.DEFAULT_SO_SOURCE_TYPE     = S.DEFAULT_SO_SOURCE_TYPE,
     T.MATERIAL_BILLABLE_FLAG     = S.MATERIAL_BILLABLE_FLAG,
     T.LAST_UPDATED_BY     = S.LAST_UPDATED_BY
     ,T.ID     = TFR.INVENTORIES_SEQ.NEXTVAL,
     T.CREATION_DATE     = CURRENT_DATE,
     T.LAST_UPDATE_DATE     = CURRENT_DATE
when not matched
then insert
     T.ORGANIZATION_ID,
     T.ITEM_ID,
     T.ITEM_TYPE,
     T.SEGMENT1,
     T.DESCRIPTION,
     T.LIST_PRICE_PER_UNIT,
     T.CREATED_BY,
     T.DEFAULT_SO_SOURCE_TYPE,
     T.MATERIAL_BILLABLE_FLAG,
     T.LAST_UPDATED_BY
     ,T.ID,
     T.CREATION_DATE,
     T.LAST_UPDATE_DATE
values
     S.ORGANIZATION_ID,
     S.ITEM_ID,
     S.ITEM_TYPE,
     S.SEGMENT1,
     S.DESCRIPTION,
     S.LIST_PRICE_PER_UNIT,
     S.CREATED_BY,
     S.DEFAULT_SO_SOURCE_TYPE,
     S.MATERIAL_BILLABLE_FLAG,
     S.LAST_UPDATED_BY
     ,TFR.INVENTORIES_SEQ.NEXTVAL,
     CURRENT_DATE,
     CURRENT_DATE
     )

ORA-30926: unable to get a stable set of rows in the source table

When user are trying to open a form getting below error.
com.retek.platform.exception.RetekUnknownSystemException:ORA-30926: unable to get a stable set of rows in the source tables
Please advice
Edited by: user13382934 on Jul 9, 2011 1:32 PM

Please try this
create table UPDTE_DEFERRED_MAILING_RECORDS nologging as
SELECT distinct a.CUST_ID,
a.EMP_ID,
a.PURCHASE_DATE,
a.drank,
c.CONTACT_CD,
c.NEW_CUST_CD,
a.DM_ROW_ID
FROM (SELECT a.ROWID AS DM_ROW_ID,
a.CUST_ID,
a.EMP_ID,
a.PURCHASE_DATE,
dense_rank() over(PARTITION BY a.CUST_ID, a.EMP_ID ORDER
BY a.PURCHASE_DATE DESC, a.ROWID) DRANK
FROM deferred_mailing a) a,
customer c
WHERE a.CUST_ID = c.CUST_ID
AND a.EMP_ID = c.EMP_ID
AND (a.PURCHASE_DATE <= c.PURCHASE_DATE OR
c.PURCHASE_DATE IS NULL)
and a.drank=1;
The query you've posted is behaving according to the expectations. The inner select is returning one row and the outer is returning two as the
WHERE a.CUST_ID = c.CUST_ID
AND a.EMP_ID = c.EMP_ID
AND (a.PURCHASE_DATE <= c.PURCHASE_DATE OR
c.PURCHASE_DATE IS NULL)
conditions are seeing two rows in the table customer.
I've added the a.drank=1 clause to skip the duplicates from the inner table and distinct in the final result to remove duplicates from the overall query result.
For eg, if you have one more row in the deferred_mailing like this
SQL> select * from DEFERRED_MAILING;
CUST_ID EMP_ID PURCHASE_
444 10 11-JAN-11
444 10 11-JAN-11
then the query without "a.drank=1" will return 4 rows like this by the outer query.
CUST_ID EMP_ID PURCHASE_ DM_ROW_ID DRANK C N
444 10 11-JAN-11 AAATi2AAGAAAACcAAB 2 Y Y
444 10 11-JAN-11 AAATi2AAGAAAACcAAA 1 Y Y
444 10 11-JAN-11 AAATi2AAGAAAACcAAB 2 Y Y
444 10 11-JAN-11 AAATi2AAGAAAACcAAA 1 Y Y
It'll return the below even if we use distinct on the same query(i.e. without a.drank=1)
CUST_ID EMP_ID PURCHASE_ DM_ROW_ID DRANK C N
444 10 11-JAN-11 AAATi2AAGAAAACcAAB 2 Y Y
444 10 11-JAN-11 AAATi2AAGAAAACcAAA 1 Y Y
which contains duplicates again.
So, we need a combination of distinct and dense here.
btw, Please mark the thread as 'answered', if you feel you got your question answered. This will save the time of others who search for open questions to answer.
Regards,
CSM

What exactly is: ORA-30926 unable to get a stable set of rows in the source tables

Oracle 8.0.3
I was wondering, if any one could tell me more about this error ?
(ORA-30926)
The only description in the oracle documentation was that this is caused due to a large amount of DML activity. I thought that Oracle is build to handle that ?
Any way, any suggestions and explication (even in theory only) are wellcome.

This is a sample of MERGE:
MERGE INTO PJ.COMBINED E
USING (SELECT RES, NET, TYPE, NP_NAME, ADJ_NP_NAME,
RESOURCE_NAME, PU_NAME, PHY_PU_NAME,
ADJ_LINK, STAT_NAME FROM PJ.EXT_COMBINED) U
ON ((E.RES = U.RES) AND (E.NET = E.NET)) WHEN MATCHED THEN UPDATE SET E.TYPE = U.TYPE, E.NP_NAME = U.NP_NAME, E.ADJ_NP_NAME = U.ADJ_NP_NAME, E.RESOURCE_NAME = U.RESOURCE_NAME, E.PU_NAME = U.PU_NAME,
E.PHY_PU_NAME = U.PHY_PU_NAME, E.ADJ_LINK = U.ADJ_LINK, E.STAT_NAME = U.STAT_NAME
WHEN NOT MATCHED THEN INSERT (E.RES, E.NET, E.TYPE, E.NP_NAME, E.ADJ_NP_NAME, E.RESOURCE_NAME, E.PU_NAME, E.PHY_PU_NAME, E.ADJ_LINK, E.STAT_NAME) VALUES (U.RES, U.NET, U.TYPE, U.NP_NAME, U.ADJ_NP_NAME, U.RESOURCE_NAME, U.PU_NAME, U.PHY_PU_NAME, U.ADJ_LINK, U.STAT_NAME);
I use this MERGE process for about 6 tables.
GD

Ora-30926 : unable to get a stable set of rows in source table

Dear All
When I try to load my cube I get the error "ora-30926 : unable to get a stable set of rows in source table".
Any idea? Googling for this error did not return any solutions.
My env:
source: Oracle 10g (10.2.x)
Target: Oracle 11g (11.1.0.7)
I am using warehouse builder 11.1.0.7 on Linux
thank you

Carsten / neashton
Thanks for your help. Duplicate rows were the issue.
I finally debugged the problem to my time dimension.
The OWB wizard generated time dimension contains only date, but no time.
Unfortunately, for me to uniquely identify my data, I need to include time also (detailed in how do I include 'Time' in a time dimension? .
Since Carsten was the first one to answer this, I am awarding the points to him.
thanks a lot both of you
Edited by: T2 on Jun 2, 2009 4:01 AM

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Re: getting the source tables into models in designer

Hi all
i need help while extracting the source table's to ODI designer
my source: Oracle
Question:
i have given the source schema information. with that information i created logical and physical schema in topology manager.
And trying to create a model to extract source tables to ODI.
As i don't have all tables in the same schema (some tables were coming from different users and i don't have the information of those users) am unable to see the those tables when in selective reverse tab.
i requested them to give select privileges for those tables in the schema which am using.
after getting the select privileges for those tables.
will i would be able to see those tables in selective reverse tab?
Could some one guide me steps in this.
Thanks

917704 wrote:
Hi Alastair
firstly thank you for your reply.
my soure is oracle erp.
i cannot create physical/logical schemas for that user bez as it is head user in oracle erp, i dont have the access for that user.Hi, I've done change data capture from ebusiness suite using ODI, what we did was this :
get a 'read only' database account set up in the ebiz suite database, this is your connecting user and your work schema (for CDC objects).
grant select any table, or be more specific if you wish on the objects you need to read data from to ODI, then connect as your read only user but map the physical schemas as you wish.
Back to your original question, a model can only have one logical schema, which in turn maps to one phyiscal schema - so I think your stuck needing to read across more than one schema on the source system.

How to get Materialized View to ignore unused columns in source table

When updating a column in a source table, records are generated in the corresponding materialized view log table. This happens even if the column being updated is not used in any MV that references the source table. That could be OK, so long as those updates are ignored. However they are not ignored, so when the MV is fast refreshed, I find it can take over a minute, even though no changes are required or made. Is there some way of configuring the materialized view log such that the materialized view refresh ignores these updates ?
So for examle if I have table TEST:
CREATE table test (
d_id NUMBER(10) PRIMARY KEY,
d_name VARCHAR2(100),
d_desc VARCHAR2(256)
This has an MV log MLOG$_TEST:
CREATE MATERIALIZED VIEW LOG ON TEST with rowid, sequence, primary key;
CREATE MATERIALIZED VIEW test_mv
refresh fast on demand
as
select d_id, d_name
from test;
INSERT 200,000 records
exec dbms_mview.refresh('TEST_MV','f');
update test set d_desc = upper(d_desc) ;
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I would love to hear a positive answer to this question - I have the exact same issue :-)
In the "old" days (version 8 I think it was) populating the materialized view logs was done by Oracle auto-creating triggers on the base table. A "trick" could then make that trigger become "FOR UPDATE OF <used_column_list>". Now-a-days it has been internalized so such "triggers" are not visible and modifiable by us mere mortals.
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But I hope someone can answer both you and me with a better solution ;-)

Best approach to get the source tables into Target

Hi
I am new to Goldengate and I would like to know what is the best approach to get the Source tables to be replicated into the target (oracle to oracle) before performing the initial load without using exp/expdp . Is there any native Goldengate utility which i can use during the initial load or before that will create the tables on the target before loading the data ?
Thanks

i dont think so, for the initial load replication your struncture should be available at target machine. once your machines are in sync then you can use goldengate ddl setup for automatically replicate the table with data.
Batter approach for you to create a structure on target machine using export improt. In export use conect=metadata_only for copy the structure only.....
like
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Row should get added in the target as soon as the data in the source table

I have done the following:
* The source table is part of the CDC process.
* I have started the journal on the source table.
Whenever I change the data in the source, I expect the target to get a new row added with a new sequence number as the surrogate key. I find that even though the source data changes, the new row does not get added.
Could someone point out to me why is the new row not getting added?

Step 1 - Sequence Number
create a sequence in your rdbms namely
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MAXVALUE 99999
START WITH 1
INCREMENT BY 1
YOU can use the above sequence in your mapping in this way
schema_name.sequence_name.nextval executed on Target option .
Next select only Insert option for sequence column .
Click on the Source datastore and in the Properties panel you will find an option called " Journalized Data Only " . Now whenever this interface runs , only the journalized data gets transferred.
The other way to see the journalized data from the source side is right click on the source datastore under the model which is journalized and now go to " changed data capture " and then to " journal data .. "
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As CDC creates as trigger at the source , so whenever there is change in the source it gets captured at the target whenver you run the interface above interface with Journalized data only option.
I hope iam clear and elaborate now.
Thanks

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Your OEM DVD that came with new iMac is the best source of drivers. Not from an older or retail DVD Mac OS X.
Windows on Mac is not 100% seemless, and as you found, not 100% supported - getting devices insalled and enabled which is what those Apple drivers should do, isn't and not having internet access does get asked and posted. Fine if the drivers did their work. "Not found" means you didn't get a good install to begin with which enables devices and chipsets.
If your Windows install lacks internet, you can't find and update.
Some have used their first install more as a trial run through test and had better success 2nd time.
Unfortunate that not all or latest changes to Boot Camp Support aren't showing or listed in its support page.
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http://support.apple.com/kb/index?page=articles

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MERGE Statement - unable to get a stable set of rows in the source tables

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