Originally posted by Ablakios
recommendation from Oracle states an average of 30-45 daily that's about once every 30 mn or so.

That's certainly the conventional wisdom. Personally, I believe that you can switch as often as you like as long as your I/O subsystem can handle it and you're not experiencing any LGWR waits.


Is there any reprecautions or what will rather be the impact on the system that perform 15-18 log switches
As far as performance goes, fewer log switches is fine. You run the risk of losing a larger period of data if you lose one of your online logs, but fewer switches is fine.