Data Extraction is nothing, but it is extracting the data from multiple different sources using ETL tools.
Here are two types of data extraction :
* Full Extraction : All extracted data from an operational system or source system load to the staging area.
* Partial Extraction : Sometimes, we get the notification from the source system to update the specific data. It is called Delta Load.
Source System Performance : The extraction strategies of data should not affect the performance of the source system.
