Yes, this will increase speed of apply considering async i/o turned on at OS level and Oracle database.
ORACLE-BASE - Direct and Asynchronous I/O
My Linux server is not turned on with async i/o - So i cannot use this parallel option in my standby >>?
Is there any other possiblites to speed up archive applying standby - apart from the mentioned method..? - Please suggest
Does your primary have async?
When you do system tuning, you identify bottlenecks, fix them, then repeat. What is the problem with fixing the i/o on the standby server?
Also, please define "huge." A simple detailed listing of the archived logs will help with that.