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....

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

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