Concepts about Archieving process and Check point Background process

I am still going through Oracle Architecture and presently on the background oracle process. I got struck about the function of Checkpoint process and how archieving process occurs. Any inputs from my friends here will be highly appreciated.

916438 wrote:
I am still going through Oracle Architecture and presently on the background oracle process. I got struck about the function of Checkpoint process and how archieving process occurs. Any inputs from my friends here will be highly appreciated. Checkpoint is an act of cleaning the dirty blocks from buffer cache to disks in order to make fast recovery(if happens) if crash happens. Having said this, this process will make sure that oracle has to recovery minimum numbers of dirty block on instance recovery phase. So there is periodic flushing of dirty blocks from buffer cache to disks. In this periodic time CKPT process will post to DBWR process to write out the dirty blocks to disks. This is basically called the incremental checkpointing.
In incremental checkpointing oracle will keep the record of most oldest block in controlfile and from this block (which is also called RBA), oracle will start recovering dirty blocks.
There is also a full checkpoint in oracle which happen when redolog switch
Now coming to archiving: An archive log is a copy of redo log files, it includes the sequence number and redo entries. Whenever there is a log switch (redo log files gets filled in circular fashion), then arch process will start archive filled redo log file. So during this process arch process will read the filled redo log files and make the copy of it in archive file. LGWR cannot write this filled redo file until ans unless arch process completes copying of redolog entries to archive log file.
Archive log files are required for recovery if in future we wish to recover database during media/datafile/controlfile failure.
Also see
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:19311485023372 - Checkpoint explained
http://docs.oracle.com/cd/B19306_01/server.102/b14231/archredo.htm - Archives
Edited by: 909592 on Mar 25, 2012 5:34 PM

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SHUTDOWN: waiting for logins to complete.&
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http://help.sap.com/saphelp_nw04/helpdata/en/5a/f72040599a8f5ce10000000a155106/frameset.htm
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II. Errors in Adapter Engine [XI : How to Re-Process failed XI Messages Automatically|XI : How to Re-Process failed XI Messages Automatically]
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best regards
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