The database back-end node contains communication components, database servers, and load measurement components, where the communication components are used to receive back-end detection requests, initiate load measurements, store load measurements into the load information table in cluster control, and accept user requests from the cluster controller, send them to the database server for execution, return the result set to the cluster controller, and the database server is used to receive user requests from the communication components and respond to them The load measurement component is used to receive and respond to load measurement requests from the communication component
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