Originally posted by jmodic
When performing media recovery, you'll never need any arch log that was created before your backup (either hot or cold), from which you restored the database, was taken. So you'll have to decide which backup is the earliest possible one that you'll ever need for recovery, and you can safely delete all arch logs that were created befor that backup started.
*clap* *clap* *clap*

That's a very good answer indeed.