Best Practice For Database Parameter ARCH_LAG_TARGET and DBWR CHECKPOINT

Hi,
For best practice - i need to know - what is the recommended or guideline concerning these 2 Databases Parameter.
I found for ARCH_LAG_TARGET, Oracle recommend to setup it to 1800 sec (30min)
Maybe some one can guide me with these 2 parameters...
Cheers

Dear unsolaris,
First of all if you want to track the full and incremental checkpoints, make the LOG_CHECKPOINT_TO_ALERT parameter TRUE. You will see the checkpoint SCN and the completion periods.
Full checkpoint is being triggered when a log switch happens and checkpoint position in the controlfile is written in the datafile headers. For just a really tiny amount of time the database could be consistent eventhough it is open and in read/write mode.
ARCH_LAG_TARGET parameter is disabled and set to 0 by default. Here is the definition for that parameter;
http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/initparams009.htm
If you want to set this parameter up the Oracle recommends it to be 1800 as you have said. This can subject to change from database to database and it is better for you to check it by experiencing it.
Regards.
Ogan

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