What is the definition of metadata?

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Metadata, also known as media data or relay data, is data that summarizes other data. It is used to define data properties, specify data storage locations and historical data, retrieve resource data, and record information.

Other related questions:
What is the definition of Tomcat?
Tomcat is a free-of-charge, lightweight, open source web application server developed by Apache Software Foundation, Sun and other companies, and individuals. Gaining support from Sun, Tomcat complies with the latest Servlet and JavaServer Page (JSP) specifications. It features advanced technology, stable performance, and good scalability, and occupies a small number of system resources during running. As a result, Tomcat applies to small- and medium-sized systems and scenarios with a few concurrent users. An HTTP server embedded in Tomcat enables Tomcat to work as a web server. It provides a configuration management tool and supports XML configuration files. Tomcat is different from the Apache web server, which is an HTTP server using C language.

What is AS
Auto Scaling (AS) is a service that automatically adjusts resources based on your service requirements and configured AS policies. You can specify AS configurations and policies based on service requirements. These configurations and policies free you from repeatedly adjusting resources to keep up with service changes and demand peaks, which helps you reduce the required resources and workforce.

What is the definition of a trace
A trace is the operation record of tracking and saving cloud service resources by Cloud Trace Service (CTS). You can view traces to see a history of operations performed by a specific user on specific resources. There are two types of traces: Trace: Refer to an operation record generated during the last seven days.Archived trace: Refer to historical operation record that has been stored in the OBS bucket.

Definition of QoS
Quality of Service (QoS) is the ability to ensure network transmission performance, for example, bandwidth. In hardware SDN, the system provides the QoS management. Users can create QoS profiles to limit the bandwidth of ECS NICs. By default, no QoS profiles are bound to the primary NIC of an ECS. Therefore, the bandwidth of the primary NIC is not limited. You can modify QoS configurations to limit the NIC bandwidth of an ECS.

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