Guanhui has 12 years of experience in database maintenance and has obtained professional certificates such as 11G OCM, Mysql OCP, ogg OCP, and weblogic OCP. He has a certain understanding of the architectures of Oracle 10g, 11g, and 19c. He is skilled in problem location, performance optimization, and disaster recovery architecture, and has rich experience in industries such as telecommunications, finance, healthcare, and government.