Fail over! Then you have to replicate
Search the forum for replication by Tamilselvan, he gave a very good explanation about replication a couple of weeks back, the difference between standard and advanmced replication etc
Although I think you only need standard replication...
1)You can use Replication which can refresh at predefined interval.
2)Apply production's archivelogs at predefined interval if the database is in ARCHIVELOG mode.
Thanks for ur responses.