“Opinions expressed are solely my own and do not express the views or opinions of my employer.” Oracle Data Guard is a great Oracle product that ensures high availability, data protection, and disaster recovery for enterprise data. However, as with any other product, sometimes there are some issues that appear and it is needed to be solved. Therefore, the post today will be about the error “ORA-01110: data file 0000: ‘$ORACLE_HOME/dbs/UNNAMED0ZZZ’”. Many causes can lead to this error but one that I can point out is when the primary database…