Bulk
Loading is a feature that’s
used in Datawarehouse to load bulk data into tables.This is explicit utility
that varies with the type of Database.
Example, For Oracle
we use SQL*Loader and for DB we use Load
Utility.
Most of the
Datawarehouse ETL tools used today makes use of Bulk Utility to load data, in
some tools we may require extra plug-in also. For Bulk Loading we mainly
require two kinds of file:
a)Control File: This file will contain the
metadata of the datafile.This file will contain the location of the source
file,datatype , column level information.
b)DataFile: This file contains the data to be
loaded into the datawarehouse.
Once we have both
the source and data files ready then we can write a command script to invoke
the bulk loader and then load the data into the Datawarehouse.If there is any
information missing in any of the Control file or Datafile then the bulk
loading will not happen and will insert no rows.
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