About a month ago, due to some communication problem with ASM instance, block_change_tracking was automatically disabled by oracle. Since then the only impact I see is the slow rman backup. It used to take 10 hours and now it takes 40-48 hours. I want to enable block_change_tracking again but I am a bit cautious as it is a production server.
I have following questions :
- If I enable block_change_tracking, will I have any side affects on the system apart from normal overhead cost that comes with this service and is it safe to do it any time ?
- Can I just enable it and RMAN will notice it next time when it runs the incremental backup or should I enable it just before starting an incremental backup ?