Generally speaking, if the content of every book in the library is data, then finding the index of every book is metadata. Metadata has incomparable advantages over other methods because it can help people understand data better.
Discover and describe the ins and outs of data, especially those enterprises that are about to upgrade from OLTP system to DW/BI system. Metadata can help them form a clear and intuitive data flow diagram, and metadata is the basic means of data management and control.
Metadata is to improve the level of * * * to enjoy, regain and understand enterprise information assets. Metadata is the lubricant of enterprise information management, and it is inappropriate not to manage or not to manage metadata.
Information will be lost or hidden, it will be difficult for users to use, and data integration will be very expensive, which will not effectively support business. It will be difficult for end users to identify relevant information, and end users will lose their trust in data.
Extended data
Metadata classification
The scope of metadata management will include data generation, data storage, data processing and data description information displayed, and help users understand the context, relationship and related attributes of data. According to the different description objects, it can be divided into three types of metadata: technical metadata, business metadata and management metadata. These three kinds of metadata are described as follows:
1, technical metadata Technical metadata is data that describes concepts, relationships and rules related to technical fields in a data system, mainly including the description of data structure and data processing, covering all data processing links such as data source interface, data warehouse and data mart storage, ETL, OLAP, data encapsulation and front-end presentation;
2. Business Metadata Business metadata is data that describes related concepts, relationships and rules of business fields in a data system, mainly including business terms, information classification, indicator definitions and business rules.
3. Management metadata Management metadata is data that describes related concepts, relationships and rules in the management field in the data system, mainly including information such as personnel roles, job responsibilities and management processes.
Baidu Encyclopedia-Metadata