Scalability is usually a really crucial think about information warehousing. It is generally onerous to foretell how a lot a knowledge warehouse will grow on the mid/long time period. Relational databases are obligatory when it is probably that the information warehouse will develop to lots of of gigabytes, or larger. Data Conversion and Migration Services – these are the processes, programs and tools used to extract the supply data from the legacy surroundings, cleanse it, remodel it, and cargo it into the info warehouse.