How can I determine the number and sizes of redologs?

Dear all,
How can I determine the number and sizes of redologs are sufficient to allow redo log switching while hot backup is in progress?
Please advice,
Amy

Two questions here - what the OP put as the subject title and what was asked in the thread, which are different questions.
I would interpret the question in the thread to mean "how to avoid hanging due to archiving waiting for a redo log group to become available." Alert log, wait events, and user complaints would be the source of information here.

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