Metadata can be defined as the data about data present
in the Data Warehouse. It can be directly linked as the Data Dictionary of the
Warehouse.
The following are the different types:
1) Operational Metadata
It consists of all the information about the
operational data sources.
2) Extraction & Transformation Metadata
It consists of the information about the
extraction of data from its sources, such as- extraction frequencies, methods
or business rules and along with extraction it also contains details about the
transformation.
3) End-User Metadata
It is the navigational map for the data
warehouse as it enables the end users to search the warehouse with their own
business terms.
Thus, Metadata connects the parts of the warehouse
together and makes it easy for end users to search.
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