Difference between SYNC/ASYNC, LGWR/ARCH, and AFFIRM/NOAFFIRM?

Hi all ;
I need some basic information about following things in data guard.(oracle 10g).
difference between SYNC/ASYNC, LGWR/ARCH, and AFFIRM/NOAFFIRM?

955912 wrote:
Hi all ;
I need some basic information about following things in data guard.(oracle 10g).
difference between SYNC/ASYNC, LGWR/ARCH, and AFFIRM/NOAFFIRM?
I believe information about the terms mentioned are well explained in the document link shared by Suntrupth so I won't explain all of them. But one thing that I believe is requiring a little clarity and that's the use of the term LGWR with the SYNCH and ASYNCH. The usual understanding is it's the LGWR that sends the message to the LNS which further would forward the change vectors to the standby site. But actually its always the LNS that reads the change vectors directly from the log buffer.That's the reason that 11g docs no longer mentions the keyword LGWR along with the SYNC and ASYNC.
HTH
Aman....

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