He focuses on Oracle database management and maintenance,troubleshooting,RAC cluster technology, performance tuning services based on OWI/Time Model/SQL,Oracle database cross-platform upgrade and migration, etc. His blog (http://blog.csdn.net/q947817003，New url:https://yushan-bai.blog.csdn.net) has more 560 articles and a total traffic of more than 1.7 million, helped many people solve database problems. He lives in a beautiful city: Hangzhou。