https://asktom.oracle.com/pls/asktom/asktom.search?tag=ora-01034-oracle-not-available
https://oracle-base.com/articles/linux/automating-database-startup-and-shutdown-on-linux
ORA-01078: failure in processing system parameters
Cài đặt từ thư viện Oracle
https://ora-data.blogspot.com/2016/11/sqlplus-not-connecting-in-oracle.html