System Change Number

hi
i know that each transaction that is committed is given a system change nunber...i saw in the
Oracle 9i upgradation book and it was talking about the Check point system change number....i
know about SCN but this thing has created some ambiguities in my mind...so is there anyone
who could explain that what is Check point SCN....and another thing that is introduced in
Oracle 9i is Row level SCN and previously SCN was Block level but still default is Block
level and wqe can tell at Table creation that what should be used...whether Block level or
Row level....
kindly explain if someone could and also tell the whole functionally of SCN in database
Regards

Salman, as far as I know the checkpoint SCN is just the SCN number at the time of checkpoint.
Also Oracle has had both block level and row level SCN numbers for some time. When a block is accessed and updated via indexes the row level SCN is generated while a full table scan just uses a block level SCN. This is a performance gain for the full scan that does not have to perform a row by row check.
If you were to refer to the specific manual, topic, and section you are having a problem understanding I or another poster may be able to discuss the material with you.
HTH -- Mark D Powell --

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How to skip or edit scn (system change number) for brarchive

hi experts,
I have searched for procedures but didnt find any accurate solution. I wanted to skip the scn or the system change number for my brarchive. I have manually transported my files in the DR site because of seems to be FTP problems. I have to skip those redologs which i have already transfered. How am i suppose to do these? I'm looking forward to a textfile or control file wherein i could edit the number of the next redolog to process or sql commands or something?
Thanks in advance.

Still not sure what exactly your problem is.
You transferred redologs; are they still available in their original oraarch location?
If no : See my answer above. Did that many times myself.
If yes : Log files will be copied by brarchive as always. Make sure that no harm will be done if they are overwritten at a place where they already exist, and where they maybe currently are processed by another program!
regards

NoLogging mode and System Change Number

Hi,
We are working on migration project from our application currently into 5.3 version to 6.0 version. once EDB is transformed into 6.0 version there is a datawarehouse to which data needs to be pushed.
There is a Oracle CDC sitting on top of EDB that populates DW staging area and then there are Informatica ETLS that moves data from Staging area to D/W
Flow is as follows
EDB =>Oracle CDC => D/W Staging => Informatica ETL => D/W
We tried pushing data to D/W via CDC once migration is done but CDC is taking lot of time to publish data to DW Staging area eg it takes 8 hours to publish 3.5 millions rows in one table. which is undesirable.
We are planning a alternate approach and during our application migration we are running the DB in nologging mode so that data is not pushed via CDC.
And we are building views on top of our EDB main tables that exposes SCN start and End ranges for a table during the time migration has taken place.
Lets says my EDB scn at start of Migration was 10 and 40 records got moved during migration then we surely know that at the max currently the SCN in EDB can be max 50.
ETL's in D/W staging knows that it has to process data where ever SCN is in the rancg of 10 to 50.
In short we are playing with SCN to populate out warehouse.
I wanted to confirm when db is in NOLOGGING mode then SCN's is still generated once commit is issued and Checkpoint happens.
Thanks
Let me know if you want more info related to question.
Rohit

I think that there is no direct link between SCN number and whether a transaction has some NOLOGGING statements or not.
SCN is a internal clock used by database instance that you cannot directly control: see 11.2 concepts Guide : http://download.oracle.com/docs/cd/E11882_01/server.112/e10713/transact.htm#CNCPT039

NoLogging mode and System Change Number? generated or not in nologging

My database is running in NOLOGGING mode ie we are switching off logging during some migration activity so that temporary records processed (when migration activity is going on) and commit issues during this time are not logged in to log files and CDC on EDB does not picks them up for movement to Datawarehouse
I wanted to know if my DB is in NOLOGGING mode then also SCN's numbers are still generated by Oracle when checkpoint occurs and Commit is issues in DB.
We are playing with SCN's during migration so just wanted to confirm if they are still generated when DB is in NOLOGGING mode.
Let me know
thanks for the help.
Rg345

rohitgoswami wrote:
Thanks for the reply.
My understanding is also the same that whenever a row is commited and checkpoint happens a new SCN is generated. I think SCN on a row can be accessed on row using ORA_ROWSCN psedocolumn.
just wanted to confirm.
Thanks for your timeThis is so wrong. Commit and Checkpoint are two different mechanisms. When you commit, the commit SCN is associated with your transaction and its change vectors are pushed to the redo log file. Checkpoint may or not happen at the same time with Commit and its happening won't impact at all for the generation of SCN.
For ora_rowscn, you should have a look in the docs,
http://download.oracle.com/docs/cd/E11882_01/server.112/e10592/pseudocolumns007.htm#SQLRF50953
HTH
Aman....

Quick question about System Change Number(SCN) in FlashBack Query topic

i know tht we can get the SCN of the database using flashback concept as follows
SQL> execute :myvariable:=dbms_flashback.get_system_change_number();
PL/SQL procedure successfully completed.
SQL> print myvariable;
MYVARIABLE
451578
for example i made some insertions into a table after this and commit is executed. If i want to rollback this transaction thn i can use
SQL> execute dbms_flashback.enable_at_system_change_number(:myvariable);
PL/SQL procedure successfully completed.
but what if i dont know the SCN of the database before the transaction(insertion in to the table). If i want to rollback the database to state where i don't know the SCN of that particular state, thn how can i do tht.
i know tht we can do it using timestamp method....but i want to know how we can use this SCN concept in this situation.
Thanks in advance....

Maybe you can use [ FLASHBACK_TRANSACTION_QUERY|http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/statviews_4186.htm#i1628130] view .

PI 7.31 (single stack) posting RFC gives this error: RFC_ERROR_SYSTEM_FAILURE: Processing of change number CO-01234 cancelled (raised by system ECCHostXYZ)

I'm trying to determine if I am dealing with an RFC connection issue or just an error resulting from the RFC itself.
The error says "Processing of change number...cancelled (raised by...ECCHostXYZ)".
I thought this was a problem with my RFC config because it is labeled as "RFC_ERROR_SYSTEM_FAILURE".
However, when I google that specific message, it appears to be an error specific to change order creation.
Here’s my google search: http://goo.gl/ZhKsm3
Here is the error again:
RFC_ERROR_SYSTEM_FAILURE: Processing of change number CO-01234 cancelled (raised by system ED1|ecc-host-xyz)
When I check ST22, I see no RFC errors.

Hi Jody,
No st22 exception is needed to be throwed in order to raise a controlled exception in the RFC.
You would need to check the RFC in the ECC system with the data that you are sending from PI, if the data is the same, you would need to check PI user RFC roles with the ECC roles user that you used to check the data integrity in the ECC test.
To avoid this error you can do a Z RFC to wrap the standard RFC and to control the exceptions errors with a BAPIRET2 strucutre to return to PI.
Hope this helps.
Regards.

How to find Change number for a Material

Hi,
If we know the material number and Revision level then how can we find the Change Number of that material.
Is there any table in which i can find Change number for a revision level or is there any Function module available.
Regards,
Vaibhav

Hi Vaibhav,
Is there any table to find the change number and revision level of a material. I have change number and material and revision level coming from external system. But i need to check that with SAP whether it exists or not.
Is there any table link to find whether a material has change number.

Error while changing BOM with change number

Hi ALL, Please help me with followed error message, I am using ECM. I created ECR and converted to ECO and then released.
Object management record cannot be generated
Message no. 29046
Diagnosis
You want to change the BOM with the entered change number.
One of the following situations triggered this error message:
1. The indicator that allows automatic generation is not set for object type BOM in the change master.
2. The indicator generation only on initial creation is set for object type BOM
3. You are processing a change request.
System response
The system checks whether the indicator object management record will be generated is set in the change master.
If the indicator generation only on initial creation is set, the system checks whether the BOM exists in the system.
Procedure
If you are authorized to change the change master, execute the following steps:
For 1.)
Set this indicator for object type BOM or create the control record in the change master.
For 2.)
If the BOM already exists in the system and the generation only on initial creation indicator is set, the system can no longer generate the control record automatically.
In this case you have to add the object control record to the change master first, then you can change the BOM in relation to the change number.
For 3.)
You cannot generate any object control records for a change request.

Hi
With your question regarding changing BOM with change number it looks lke there may be problem in defining the Object types,objects.Moreover whenever converted to ECO you need to enter into cs02 tcode for changing the bom with relevant change number and valid from date.
Hope this gives you a clear idea.let me know if you need anyfurther inputs.
Regards
Praveen

MM02 - Enable options change number, change overview and change documents

I am with the following problem: I enter the transaction MM02, I enter the material 1000765, I select the view "Classification". Later I access the environment option from the menu bar and options for change number, change overwiew and change documents are disabled.
How do I enable these options change number, change overview and change documents?
Regards,
Sérgio Salomã

Hi Sergio,
If we activate the change documents for classification data, then we will be able to see the CHANGE DOCUMENTS for characteristic values through CL20N transaction (CL20N via menu ENVIRONMENT --> Change Documents) or MM02.
For reference please check SAP Note 65124.
For enabling change documents for classification data in SPRO --> Cross-Application Components --> Classification System --> Classes --> Maintain Object Types and Class Types.
In this enter into MARA table entry. Inside that corresponding to the respective CLASS TYPE (say 001) enable the CHANGE DOCS check box in Classifications part (For enabling this please check SAP Note 65124). Then for this CLASS TYPE (say 001) inside the OBJECTS folder, enable the CHANGE DOCS CLASS checkbox also.
Now in MM02 and in CL20N under menu Environment --> Change Documents you can view all the changes done to that characteristic values.
Once the change documents is activated, then we can get the change documents details in CDHDR and CDPOS tables. The OBJECTCLAS may be "CLASSIFY". We can also use the "CLLA_CHANGE_DOC_CLASSIFICATION" function module to fetch the data from these tables.
Hope this helps in solving your issue.
Thanks and Regards,
Harish kumar.

Change Number Release (JS41)

Hi All,
I am trying to release a change number from js40, but within
500 secs it gives me the following Dump message saying..
"ABAP/4 processor: TSV_TNEW_PAGE_ALLOC_FAILED"
please suggest any soution to it.
thanks,
Abhay Mehta.

Dear Abhay ,
I have Observed your system closely and found that the table "JGTSADR " contains too many entries (Approx 23 Lacs).
And the program tries to fetch all these entries in the internal table which overflows the internal table memory.
The query which is fetching these records does not contain any filters. Please try to Apply some filters on the select query in consultation with SAP (OSS ) so that you will not face such problems in future.
Reward if Helpful.
Regards,
Nikhil

ECM-Problem with Change number in CS01 and CS02 Transactions

Hi Experts,
I am creating or changing BOM's using above transactions. I am entering the change number while creation and changing the BOM to track the changes.Here my problem is these transactions are not validating the ECM number.
If you enter any value in the change number filed system is allowing me to create a BOM.
I am assuming that becasue of patches applied to system,I am getting this.
kindly help me out on this issue.
Thanks in Advance,
Regards,
Rakesh J
Edited by: J.Rakesh on Apr 22, 2009 10:26 PM

Dear Mangalraj,
Thanks for your reply.
We are not using CC01 transaction to create Change number. Z transaction is there to create change number.
My change number contain alpha numreic charectors Eg : 341793ABCXYZ
Yes, in CS01 system is accepeting any value that we enter :Eg: asddfgh. The value is not there in AENR table.
I observed one thing If I am going to chnage a material using MM02, there its not accepeting any value,its accepeting the values which are there in AENR table otherwise its giving error :Change Number XXXXXXXX does not exist.
My question is same thing should function in CS01 and CS02, why its not happening for these transactions.
Regards,
Rakesh J

Daily Change Number.

Is anybody using this functionality in your SAP system ? This is different than regular change number.

Dear Vinay,
I will explain very clearly,
1.If there are changes in material master which will become effective immediately,then ECN without release key will be created and the
changes will be made with respect to that Change number.
2.If the Changes are for a BOM ,then ECN will be created with Release key and the changes will be made.
3.Once if the changes are to be made effective,then in CC02,by entering the Change number the same will be released and the
changes made with respect to that ECN will become effective.
4.IF the BOM changes are to be made effective immediately,then ECN without release key itself can be used and the changes can be
made or create with release key ,but after making BOM Changes,the same has to be released.
5.Daily an ECN will not created,if needed then it will be created on that particular day.
6.Revert back if more clarifications are needed.
Regards
Mangalraj.S

BOM change number field is compulsory

Hi Guys,
I need to setup BOM (CS02) change number entry field is compulsory (using TCode CS02). How to setup config settings? pls advise
Thanks,
Sankaran

Dear Muthusamy,
Even if you have maintained settings in OS27,In T code CS02 ,the system allows
you to change the BOM without a change number.
The same question was posted by Mr.Anbalagan ,3 days before.
The follwing are the answers which I posted to him,check this under post thread name ECR Number
If you want to make Change number field as mandatory for CS02,u have to do it
using the authorisation object.For certain users you can make this as an
mandatory field ,just discuss with Basis & ABAP consultants,they can help out
you in this regard.
Though you might have done settings perfectly in OS27,OS54,but the system
allows you to change a BOM without any change number.
Answer2:

Plz make this Authorization Object C_STUE_NOH as mandatory for T code CS02.
I'm sure BASIS & ABAP consultant can help you in this regard.
I have checked in my system for certain users,like without change number it doesnt allow to change BOM,
So after giving SU53,I found the authorization obeject C_STUE_NOH was missing.
So go ahead in using this object.
answer3:
You can make that field in CS02 as a mandatory for certain users,using a field
exit.
Field name AENNR -Change number can be made as mandatory .
Plz explain the case to ABAP consultant.
First in SE37 he will be checking whether this particular field AENNR has got a field exit.
Later on he will be writing some codes to make this field as mandatory.
This is what i wanted to convey to u.
In my project ,for the core users the field has been made mandatory,so in CS02,he/she cant go inside without giving the change number.
At that time when u give SU53,this authorisation object will be found not given.
So just have a word with the ABAP consultant,he can help u.
Reward points if useful.
Regards
Mangal
Message was edited by:
Mangalraj

How to set change number is prerequisite when change BOM?

Dear SAP Experts,
I have actived EC management in BOM control data in IMG. But when i changed
BOM ( the code CS02 ) with change number blank, system had not given an error message. SO,how to set change number is prerequisite when change BOMs?
Thanks...
Regards,
Joey.

Just a guess: Transaction os27 and change the number range to external.
Matthias

Change number of material master

Hi gurus
can anyone pls explain the importance of change number field in the initial screen while creating a material master( mm01)
regards
john

Hi,
Please look help data
Change Number
Number used to uniquely identify a change master record.
The data that contains all information required for managing a change.
The master record contains descriptive data, such as the reason for the change, and data with control functions, such as valid-from date and indicators for object types. In addition to this data, which can be updated directly, there is data that the system updates automatically, such as administrative data.
Thanks
suresh

System Change Number

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