Process dbwriter and checkpoint

Hi,
It is known that when the redo log buffer is full at the third(1/3) , the datas which are in the redolog buffer are sent to the database's redo log files .
What happens then with the dbwriter process and the checkpoint process?Is there a new sequence number( SCN=system change number) created when the redo log buffer is sent to the database ?
Secondly, concerning the log_check_point_interval, can you explain to me what means that "in the number of redo log file blocks that can exist between an incremental checkpoint and the last block written to the redo log. This number refers to physical operating system blocks, not database blocks."
LOG_CHECKPOINT_INTERVAL specifies the frequency of checkpoints in terms of the number of redo log file blocks that can exist between an incremental checkpoint and the last block written to the redo log. This number refers to physical operating system blocks, not database blocks.
I don't exactly understand when occurs a log_checkpoint and what means that it concerns operating system blocks and not database blocks.
Does it mean it concerns the redo log buffer?
Thanks a lot for your answer.
Best regards.
Nathalie

DBWR does not write dirty buffers to the corresponding disk blocks until the Redo for those blocks (i.e. the changes made to the blocks) has been written by LGWR to the online redo log files. Therefore, Redo is always written to disk before modified blocks (whether they be table or index or undo blocks) are rewritten to disk.
The block size for online redo log files is NOT the database block size (which is specified by the instance parameter db_block_size). Redo log files are written direct to the OS and use the OS's block size -- which is typically 512bytes.
Thus, specifying LOG_CHECKPOINT_INTERVAL of, say, 100000 is an instruction to Oracle that "when the current online redo log file is about 50MB (100000 512byte blocks is 48.82125MB) written, issue a Checkpoint to DBWR so that DBWR also writes dirty buffers to disk". That way, every checkpoint interval is actually smaller than the actual online redo log file (a checkpoint will still be issued when the online redo log file is full and a switch logfile occcurs).
Hemant K Chitale

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May someone help me to know when capture/pump/replicat process does a checkpoint? There are 2 things which made me confused.
- CHECKPOINTSECS parameter: There is no setting in the parameter file, that means it will be set by default (10s)
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In my source db, there was a long running transaction lasting for 1 hour and already committed and written to the local trail files. Then the pump process have started to read the trail files to pump to target. My concern is when the capture/pump/replicat process do a checkpoint? 10s or 1 hour?
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GG: 11gR1 (11.1)
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Hieu
Edited by: 972362 on Nov 21, 2012 2:36 AM

CHECKPOINTSECS defines how often an extract makes its regular checkpoints. An extract will make a checkpoint every 10 seconds if this value is set to 10 irrespective of a transaction that is running for 1 hour. Extract also writes commit checkpoints when a transaction is committed.
In the example where your Pump is showing time since checkpoint as greater than 10 could have a problem at the network level or issues with the remote trail..
that is my observation as I had an extract that was being shown as RUNNING but time since last checkpoint was in hours and when i checked the report file, it had an error.

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Process dbwriter and checkpoint

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