As i said earlier, i have log members located on separate disks and they are secure.

Also i have only one arch log per day and is this healthy? ?. This one lil worries me.

I have read that the logs be switched every 30mins to have arch logs in sufficient numbers per day. Does this needs to be done manually? or this is implicitly done by setting init parameter.

I have not configured Dataguard for this db.