Description: the great god, and I am the oracle database small white, the other day from the boss need a data warehouse task, for baidu in a double learned some knowledge of the data warehouse after operation, the first is the concept of a data layer, when it comes to data stratified by this time have a data synchronization problems, combined with their own situation, several search feeling kettle, right needs to be imported into the daily business increasing data of data warehouse metadata layer, baidu for a long time, however, failed to find some reasonable way, hope the great god of all stripes give some advice and help,