I am currently responsible for the daily operation and maintenance of databases at Microsoft, including backup and recovery, performance tuning, log analysis, data migration, sharding, etc., solving unexpected problems and ensuring the security and stability of the database. In addition, I design and plan the data layer architecture according to business needs, and formulate and review database access code specifications for the R&D team. In addition, I participate in the design and development of automated operation and maintenance tools, and provide technical guidance and support to the system engineering team. Through my skills and expertise, I contribute to improving service quality, efficiency and customer satisfaction.