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

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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
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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.
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http://download.oracle.com/docs/cd/E11882_01/server.112/e10592/pseudocolumns007.htm#SQLRF50953
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NoLogging mode and System Change Number

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