worked on various editions of oracle(10g,11g) and Sql server(2005,2008,2008r2,2012)..on oracle does the administration activities like oracle installation, using dbca, managing db storage structures, user security, implemented db security, backup and recovery, using recovery manager, flash back,... on Sql server installation and upgradation,backup and recovery, query tuning, ha concepts like db mirroring, log shipping, replication, always on, clustering etc.,