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How often should I be switching log files?

I get the message "Thread 1 advanced to log sequence xxxx" about every 30 seconds during a large load of the Oracle DW every night. Is 30 seconds too frequent? If so, what action should I take to make it occur less frequently. I do NOT get messages like "checkpoint not complete" which I interpreted to mean that the size of the log files was adequate.
You should be switching log files every 15 minutes or so. You need to drop and recreate larger redo logs.

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